vendor/assets/javascripts/knockout.js in knockoutjs-rails-3.3.0 vs vendor/assets/javascripts/knockout.js in knockoutjs-rails-3.3.0.1
- old
+ new
@@ -2,114 +2,5474 @@
* Knockout JavaScript library v3.3.0
* (c) Steven Sanderson - http://knockoutjs.com/
* License: MIT (http://www.opensource.org/licenses/mit-license.php)
*/
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+(function(){
+var DEBUG=true;
+(function(undefined){
+ // (0, eval)('this') is a robust way of getting a reference to the global object
+ // For details, see http://stackoverflow.com/questions/14119988/return-this-0-evalthis/14120023#14120023
+ var window = this || (0, eval)('this'),
+ document = window['document'],
+ navigator = window['navigator'],
+ jQueryInstance = window["jQuery"],
+ JSON = window["JSON"];
+(function(factory) {
+ // Support three module loading scenarios
+ if (typeof define === 'function' && define['amd']) {
+ // [1] AMD anonymous module
+ define(['exports', 'require'], factory);
+ } else if (typeof require === 'function' && typeof exports === 'object' && typeof module === 'object') {
+ // [2] CommonJS/Node.js
+ factory(module['exports'] || exports); // module.exports is for Node.js
+ } else {
+ // [3] No module loader (plain <script> tag) - put directly in global namespace
+ factory(window['ko'] = {});
+ }
+}(function(koExports, amdRequire){
+// Internally, all KO objects are attached to koExports (even the non-exported ones whose names will be minified by the closure compiler).
+// In the future, the following "ko" variable may be made distinct from "koExports" so that private objects are not externally reachable.
+var ko = typeof koExports !== 'undefined' ? koExports : {};
+// Google Closure Compiler helpers (used only to make the minified file smaller)
+ko.exportSymbol = function(koPath, object) {
+ var tokens = koPath.split(".");
+
+ // In the future, "ko" may become distinct from "koExports" (so that non-exported objects are not reachable)
+ // At that point, "target" would be set to: (typeof koExports !== "undefined" ? koExports : ko)
+ var target = ko;
+
+ for (var i = 0; i < tokens.length - 1; i++)
+ target = target[tokens[i]];
+ target[tokens[tokens.length - 1]] = object;
+};
+ko.exportProperty = function(owner, publicName, object) {
+ owner[publicName] = object;
+};
+ko.version = "3.3.0";
+
+ko.exportSymbol('version', ko.version);
+ko.utils = (function () {
+ function objectForEach(obj, action) {
+ for (var prop in obj) {
+ if (obj.hasOwnProperty(prop)) {
+ action(prop, obj[prop]);
+ }
+ }
+ }
+
+ function extend(target, source) {
+ if (source) {
+ for(var prop in source) {
+ if(source.hasOwnProperty(prop)) {
+ target[prop] = source[prop];
+ }
+ }
+ }
+ return target;
+ }
+
+ function setPrototypeOf(obj, proto) {
+ obj.__proto__ = proto;
+ return obj;
+ }
+
+ var canSetPrototype = ({ __proto__: [] } instanceof Array);
+
+ // Represent the known event types in a compact way, then at runtime transform it into a hash with event name as key (for fast lookup)
+ var knownEvents = {}, knownEventTypesByEventName = {};
+ var keyEventTypeName = (navigator && /Firefox\/2/i.test(navigator.userAgent)) ? 'KeyboardEvent' : 'UIEvents';
+ knownEvents[keyEventTypeName] = ['keyup', 'keydown', 'keypress'];
+ knownEvents['MouseEvents'] = ['click', 'dblclick', 'mousedown', 'mouseup', 'mousemove', 'mouseover', 'mouseout', 'mouseenter', 'mouseleave'];
+ objectForEach(knownEvents, function(eventType, knownEventsForType) {
+ if (knownEventsForType.length) {
+ for (var i = 0, j = knownEventsForType.length; i < j; i++)
+ knownEventTypesByEventName[knownEventsForType[i]] = eventType;
+ }
+ });
+ var eventsThatMustBeRegisteredUsingAttachEvent = { 'propertychange': true }; // Workaround for an IE9 issue - https://github.com/SteveSanderson/knockout/issues/406
+
+ // Detect IE versions for bug workarounds (uses IE conditionals, not UA string, for robustness)
+ // Note that, since IE 10 does not support conditional comments, the following logic only detects IE < 10.
+ // Currently this is by design, since IE 10+ behaves correctly when treated as a standard browser.
+ // If there is a future need to detect specific versions of IE10+, we will amend this.
+ var ieVersion = document && (function() {
+ var version = 3, div = document.createElement('div'), iElems = div.getElementsByTagName('i');
+
+ // Keep constructing conditional HTML blocks until we hit one that resolves to an empty fragment
+ while (
+ div.innerHTML = '<!--[if gt IE ' + (++version) + ']><i></i><![endif]-->',
+ iElems[0]
+ ) {}
+ return version > 4 ? version : undefined;
+ }());
+ var isIe6 = ieVersion === 6,
+ isIe7 = ieVersion === 7;
+
+ function isClickOnCheckableElement(element, eventType) {
+ if ((ko.utils.tagNameLower(element) !== "input") || !element.type) return false;
+ if (eventType.toLowerCase() != "click") return false;
+ var inputType = element.type;
+ return (inputType == "checkbox") || (inputType == "radio");
+ }
+
+ // For details on the pattern for changing node classes
+ // see: https://github.com/knockout/knockout/issues/1597
+ var cssClassNameRegex = /\S+/g;
+
+ function toggleDomNodeCssClass(node, classNames, shouldHaveClass) {
+ var addOrRemoveFn;
+ if (classNames) {
+ if (typeof node.classList === 'object') {
+ addOrRemoveFn = node.classList[shouldHaveClass ? 'add' : 'remove'];
+ ko.utils.arrayForEach(classNames.match(cssClassNameRegex), function(className) {
+ addOrRemoveFn.call(node.classList, className);
+ });
+ } else if (typeof node.className['baseVal'] === 'string') {
+ // SVG tag .classNames is an SVGAnimatedString instance
+ toggleObjectClassPropertyString(node.className, 'baseVal', classNames, shouldHaveClass);
+ } else {
+ // node.className ought to be a string.
+ toggleObjectClassPropertyString(node, 'className', classNames, shouldHaveClass);
+ }
+ }
+ }
+
+ function toggleObjectClassPropertyString(obj, prop, classNames, shouldHaveClass) {
+ // obj/prop is either a node/'className' or a SVGAnimatedString/'baseVal'.
+ var currentClassNames = obj[prop].match(cssClassNameRegex) || [];
+ ko.utils.arrayForEach(classNames.match(cssClassNameRegex), function(className) {
+ ko.utils.addOrRemoveItem(currentClassNames, className, shouldHaveClass);
+ });
+ obj[prop] = currentClassNames.join(" ");
+ }
+
+ return {
+ fieldsIncludedWithJsonPost: ['authenticity_token', /^__RequestVerificationToken(_.*)?$/],
+
+ arrayForEach: function (array, action) {
+ for (var i = 0, j = array.length; i < j; i++)
+ action(array[i], i);
+ },
+
+ arrayIndexOf: function (array, item) {
+ if (typeof Array.prototype.indexOf == "function")
+ return Array.prototype.indexOf.call(array, item);
+ for (var i = 0, j = array.length; i < j; i++)
+ if (array[i] === item)
+ return i;
+ return -1;
+ },
+
+ arrayFirst: function (array, predicate, predicateOwner) {
+ for (var i = 0, j = array.length; i < j; i++)
+ if (predicate.call(predicateOwner, array[i], i))
+ return array[i];
+ return null;
+ },
+
+ arrayRemoveItem: function (array, itemToRemove) {
+ var index = ko.utils.arrayIndexOf(array, itemToRemove);
+ if (index > 0) {
+ array.splice(index, 1);
+ }
+ else if (index === 0) {
+ array.shift();
+ }
+ },
+
+ arrayGetDistinctValues: function (array) {
+ array = array || [];
+ var result = [];
+ for (var i = 0, j = array.length; i < j; i++) {
+ if (ko.utils.arrayIndexOf(result, array[i]) < 0)
+ result.push(array[i]);
+ }
+ return result;
+ },
+
+ arrayMap: function (array, mapping) {
+ array = array || [];
+ var result = [];
+ for (var i = 0, j = array.length; i < j; i++)
+ result.push(mapping(array[i], i));
+ return result;
+ },
+
+ arrayFilter: function (array, predicate) {
+ array = array || [];
+ var result = [];
+ for (var i = 0, j = array.length; i < j; i++)
+ if (predicate(array[i], i))
+ result.push(array[i]);
+ return result;
+ },
+
+ arrayPushAll: function (array, valuesToPush) {
+ if (valuesToPush instanceof Array)
+ array.push.apply(array, valuesToPush);
+ else
+ for (var i = 0, j = valuesToPush.length; i < j; i++)
+ array.push(valuesToPush[i]);
+ return array;
+ },
+
+ addOrRemoveItem: function(array, value, included) {
+ var existingEntryIndex = ko.utils.arrayIndexOf(ko.utils.peekObservable(array), value);
+ if (existingEntryIndex < 0) {
+ if (included)
+ array.push(value);
+ } else {
+ if (!included)
+ array.splice(existingEntryIndex, 1);
+ }
+ },
+
+ canSetPrototype: canSetPrototype,
+
+ extend: extend,
+
+ setPrototypeOf: setPrototypeOf,
+
+ setPrototypeOfOrExtend: canSetPrototype ? setPrototypeOf : extend,
+
+ objectForEach: objectForEach,
+
+ objectMap: function(source, mapping) {
+ if (!source)
+ return source;
+ var target = {};
+ for (var prop in source) {
+ if (source.hasOwnProperty(prop)) {
+ target[prop] = mapping(source[prop], prop, source);
+ }
+ }
+ return target;
+ },
+
+ emptyDomNode: function (domNode) {
+ while (domNode.firstChild) {
+ ko.removeNode(domNode.firstChild);
+ }
+ },
+
+ moveCleanedNodesToContainerElement: function(nodes) {
+ // Ensure it's a real array, as we're about to reparent the nodes and
+ // we don't want the underlying collection to change while we're doing that.
+ var nodesArray = ko.utils.makeArray(nodes);
+ var templateDocument = (nodesArray[0] && nodesArray[0].ownerDocument) || document;
+
+ var container = templateDocument.createElement('div');
+ for (var i = 0, j = nodesArray.length; i < j; i++) {
+ container.appendChild(ko.cleanNode(nodesArray[i]));
+ }
+ return container;
+ },
+
+ cloneNodes: function (nodesArray, shouldCleanNodes) {
+ for (var i = 0, j = nodesArray.length, newNodesArray = []; i < j; i++) {
+ var clonedNode = nodesArray[i].cloneNode(true);
+ newNodesArray.push(shouldCleanNodes ? ko.cleanNode(clonedNode) : clonedNode);
+ }
+ return newNodesArray;
+ },
+
+ setDomNodeChildren: function (domNode, childNodes) {
+ ko.utils.emptyDomNode(domNode);
+ if (childNodes) {
+ for (var i = 0, j = childNodes.length; i < j; i++)
+ domNode.appendChild(childNodes[i]);
+ }
+ },
+
+ replaceDomNodes: function (nodeToReplaceOrNodeArray, newNodesArray) {
+ var nodesToReplaceArray = nodeToReplaceOrNodeArray.nodeType ? [nodeToReplaceOrNodeArray] : nodeToReplaceOrNodeArray;
+ if (nodesToReplaceArray.length > 0) {
+ var insertionPoint = nodesToReplaceArray[0];
+ var parent = insertionPoint.parentNode;
+ for (var i = 0, j = newNodesArray.length; i < j; i++)
+ parent.insertBefore(newNodesArray[i], insertionPoint);
+ for (var i = 0, j = nodesToReplaceArray.length; i < j; i++) {
+ ko.removeNode(nodesToReplaceArray[i]);
+ }
+ }
+ },
+
+ fixUpContinuousNodeArray: function(continuousNodeArray, parentNode) {
+ // Before acting on a set of nodes that were previously outputted by a template function, we have to reconcile
+ // them against what is in the DOM right now. It may be that some of the nodes have already been removed, or that
+ // new nodes might have been inserted in the middle, for example by a binding. Also, there may previously have been
+ // leading comment nodes (created by rewritten string-based templates) that have since been removed during binding.
+ // So, this function translates the old "map" output array into its best guess of the set of current DOM nodes.
+ //
+ // Rules:
+ // [A] Any leading nodes that have been removed should be ignored
+ // These most likely correspond to memoization nodes that were already removed during binding
+ // See https://github.com/SteveSanderson/knockout/pull/440
+ // [B] We want to output a continuous series of nodes. So, ignore any nodes that have already been removed,
+ // and include any nodes that have been inserted among the previous collection
+
+ if (continuousNodeArray.length) {
+ // The parent node can be a virtual element; so get the real parent node
+ parentNode = (parentNode.nodeType === 8 && parentNode.parentNode) || parentNode;
+
+ // Rule [A]
+ while (continuousNodeArray.length && continuousNodeArray[0].parentNode !== parentNode)
+ continuousNodeArray.splice(0, 1);
+
+ // Rule [B]
+ if (continuousNodeArray.length > 1) {
+ var current = continuousNodeArray[0], last = continuousNodeArray[continuousNodeArray.length - 1];
+ // Replace with the actual new continuous node set
+ continuousNodeArray.length = 0;
+ while (current !== last) {
+ continuousNodeArray.push(current);
+ current = current.nextSibling;
+ if (!current) // Won't happen, except if the developer has manually removed some DOM elements (then we're in an undefined scenario)
+ return;
+ }
+ continuousNodeArray.push(last);
+ }
+ }
+ return continuousNodeArray;
+ },
+
+ setOptionNodeSelectionState: function (optionNode, isSelected) {
+ // IE6 sometimes throws "unknown error" if you try to write to .selected directly, whereas Firefox struggles with setAttribute. Pick one based on browser.
+ if (ieVersion < 7)
+ optionNode.setAttribute("selected", isSelected);
+ else
+ optionNode.selected = isSelected;
+ },
+
+ stringTrim: function (string) {
+ return string === null || string === undefined ? '' :
+ string.trim ?
+ string.trim() :
+ string.toString().replace(/^[\s\xa0]+|[\s\xa0]+$/g, '');
+ },
+
+ stringStartsWith: function (string, startsWith) {
+ string = string || "";
+ if (startsWith.length > string.length)
+ return false;
+ return string.substring(0, startsWith.length) === startsWith;
+ },
+
+ domNodeIsContainedBy: function (node, containedByNode) {
+ if (node === containedByNode)
+ return true;
+ if (node.nodeType === 11)
+ return false; // Fixes issue #1162 - can't use node.contains for document fragments on IE8
+ if (containedByNode.contains)
+ return containedByNode.contains(node.nodeType === 3 ? node.parentNode : node);
+ if (containedByNode.compareDocumentPosition)
+ return (containedByNode.compareDocumentPosition(node) & 16) == 16;
+ while (node && node != containedByNode) {
+ node = node.parentNode;
+ }
+ return !!node;
+ },
+
+ domNodeIsAttachedToDocument: function (node) {
+ return ko.utils.domNodeIsContainedBy(node, node.ownerDocument.documentElement);
+ },
+
+ anyDomNodeIsAttachedToDocument: function(nodes) {
+ return !!ko.utils.arrayFirst(nodes, ko.utils.domNodeIsAttachedToDocument);
+ },
+
+ tagNameLower: function(element) {
+ // For HTML elements, tagName will always be upper case; for XHTML elements, it'll be lower case.
+ // Possible future optimization: If we know it's an element from an XHTML document (not HTML),
+ // we don't need to do the .toLowerCase() as it will always be lower case anyway.
+ return element && element.tagName && element.tagName.toLowerCase();
+ },
+
+ registerEventHandler: function (element, eventType, handler) {
+ var mustUseAttachEvent = ieVersion && eventsThatMustBeRegisteredUsingAttachEvent[eventType];
+ if (!mustUseAttachEvent && jQueryInstance) {
+ jQueryInstance(element)['bind'](eventType, handler);
+ } else if (!mustUseAttachEvent && typeof element.addEventListener == "function")
+ element.addEventListener(eventType, handler, false);
+ else if (typeof element.attachEvent != "undefined") {
+ var attachEventHandler = function (event) { handler.call(element, event); },
+ attachEventName = "on" + eventType;
+ element.attachEvent(attachEventName, attachEventHandler);
+
+ // IE does not dispose attachEvent handlers automatically (unlike with addEventListener)
+ // so to avoid leaks, we have to remove them manually. See bug #856
+ ko.utils.domNodeDisposal.addDisposeCallback(element, function() {
+ element.detachEvent(attachEventName, attachEventHandler);
+ });
+ } else
+ throw new Error("Browser doesn't support addEventListener or attachEvent");
+ },
+
+ triggerEvent: function (element, eventType) {
+ if (!(element && element.nodeType))
+ throw new Error("element must be a DOM node when calling triggerEvent");
+
+ // For click events on checkboxes and radio buttons, jQuery toggles the element checked state *after* the
+ // event handler runs instead of *before*. (This was fixed in 1.9 for checkboxes but not for radio buttons.)
+ // IE doesn't change the checked state when you trigger the click event using "fireEvent".
+ // In both cases, we'll use the click method instead.
+ var useClickWorkaround = isClickOnCheckableElement(element, eventType);
+
+ if (jQueryInstance && !useClickWorkaround) {
+ jQueryInstance(element)['trigger'](eventType);
+ } else if (typeof document.createEvent == "function") {
+ if (typeof element.dispatchEvent == "function") {
+ var eventCategory = knownEventTypesByEventName[eventType] || "HTMLEvents";
+ var event = document.createEvent(eventCategory);
+ event.initEvent(eventType, true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, element);
+ element.dispatchEvent(event);
+ }
+ else
+ throw new Error("The supplied element doesn't support dispatchEvent");
+ } else if (useClickWorkaround && element.click) {
+ element.click();
+ } else if (typeof element.fireEvent != "undefined") {
+ element.fireEvent("on" + eventType);
+ } else {
+ throw new Error("Browser doesn't support triggering events");
+ }
+ },
+
+ unwrapObservable: function (value) {
+ return ko.isObservable(value) ? value() : value;
+ },
+
+ peekObservable: function (value) {
+ return ko.isObservable(value) ? value.peek() : value;
+ },
+
+ toggleDomNodeCssClass: toggleDomNodeCssClass,
+
+ setTextContent: function(element, textContent) {
+ var value = ko.utils.unwrapObservable(textContent);
+ if ((value === null) || (value === undefined))
+ value = "";
+
+ // We need there to be exactly one child: a text node.
+ // If there are no children, more than one, or if it's not a text node,
+ // we'll clear everything and create a single text node.
+ var innerTextNode = ko.virtualElements.firstChild(element);
+ if (!innerTextNode || innerTextNode.nodeType != 3 || ko.virtualElements.nextSibling(innerTextNode)) {
+ ko.virtualElements.setDomNodeChildren(element, [element.ownerDocument.createTextNode(value)]);
+ } else {
+ innerTextNode.data = value;
+ }
+
+ ko.utils.forceRefresh(element);
+ },
+
+ setElementName: function(element, name) {
+ element.name = name;
+
+ // Workaround IE 6/7 issue
+ // - https://github.com/SteveSanderson/knockout/issues/197
+ // - http://www.matts411.com/post/setting_the_name_attribute_in_ie_dom/
+ if (ieVersion <= 7) {
+ try {
+ element.mergeAttributes(document.createElement("<input name='" + element.name + "'/>"), false);
+ }
+ catch(e) {} // For IE9 with doc mode "IE9 Standards" and browser mode "IE9 Compatibility View"
+ }
+ },
+
+ forceRefresh: function(node) {
+ // Workaround for an IE9 rendering bug - https://github.com/SteveSanderson/knockout/issues/209
+ if (ieVersion >= 9) {
+ // For text nodes and comment nodes (most likely virtual elements), we will have to refresh the container
+ var elem = node.nodeType == 1 ? node : node.parentNode;
+ if (elem.style)
+ elem.style.zoom = elem.style.zoom;
+ }
+ },
+
+ ensureSelectElementIsRenderedCorrectly: function(selectElement) {
+ // Workaround for IE9 rendering bug - it doesn't reliably display all the text in dynamically-added select boxes unless you force it to re-render by updating the width.
+ // (See https://github.com/SteveSanderson/knockout/issues/312, http://stackoverflow.com/questions/5908494/select-only-shows-first-char-of-selected-option)
+ // Also fixes IE7 and IE8 bug that causes selects to be zero width if enclosed by 'if' or 'with'. (See issue #839)
+ if (ieVersion) {
+ var originalWidth = selectElement.style.width;
+ selectElement.style.width = 0;
+ selectElement.style.width = originalWidth;
+ }
+ },
+
+ range: function (min, max) {
+ min = ko.utils.unwrapObservable(min);
+ max = ko.utils.unwrapObservable(max);
+ var result = [];
+ for (var i = min; i <= max; i++)
+ result.push(i);
+ return result;
+ },
+
+ makeArray: function(arrayLikeObject) {
+ var result = [];
+ for (var i = 0, j = arrayLikeObject.length; i < j; i++) {
+ result.push(arrayLikeObject[i]);
+ };
+ return result;
+ },
+
+ isIe6 : isIe6,
+ isIe7 : isIe7,
+ ieVersion : ieVersion,
+
+ getFormFields: function(form, fieldName) {
+ var fields = ko.utils.makeArray(form.getElementsByTagName("input")).concat(ko.utils.makeArray(form.getElementsByTagName("textarea")));
+ var isMatchingField = (typeof fieldName == 'string')
+ ? function(field) { return field.name === fieldName }
+ : function(field) { return fieldName.test(field.name) }; // Treat fieldName as regex or object containing predicate
+ var matches = [];
+ for (var i = fields.length - 1; i >= 0; i--) {
+ if (isMatchingField(fields[i]))
+ matches.push(fields[i]);
+ };
+ return matches;
+ },
+
+ parseJson: function (jsonString) {
+ if (typeof jsonString == "string") {
+ jsonString = ko.utils.stringTrim(jsonString);
+ if (jsonString) {
+ if (JSON && JSON.parse) // Use native parsing where available
+ return JSON.parse(jsonString);
+ return (new Function("return " + jsonString))(); // Fallback on less safe parsing for older browsers
+ }
+ }
+ return null;
+ },
+
+ stringifyJson: function (data, replacer, space) { // replacer and space are optional
+ if (!JSON || !JSON.stringify)
+ throw new Error("Cannot find JSON.stringify(). Some browsers (e.g., IE < 8) don't support it natively, but you can overcome this by adding a script reference to json2.js, downloadable from http://www.json.org/json2.js");
+ return JSON.stringify(ko.utils.unwrapObservable(data), replacer, space);
+ },
+
+ postJson: function (urlOrForm, data, options) {
+ options = options || {};
+ var params = options['params'] || {};
+ var includeFields = options['includeFields'] || this.fieldsIncludedWithJsonPost;
+ var url = urlOrForm;
+
+ // If we were given a form, use its 'action' URL and pick out any requested field values
+ if((typeof urlOrForm == 'object') && (ko.utils.tagNameLower(urlOrForm) === "form")) {
+ var originalForm = urlOrForm;
+ url = originalForm.action;
+ for (var i = includeFields.length - 1; i >= 0; i--) {
+ var fields = ko.utils.getFormFields(originalForm, includeFields[i]);
+ for (var j = fields.length - 1; j >= 0; j--)
+ params[fields[j].name] = fields[j].value;
+ }
+ }
+
+ data = ko.utils.unwrapObservable(data);
+ var form = document.createElement("form");
+ form.style.display = "none";
+ form.action = url;
+ form.method = "post";
+ for (var key in data) {
+ // Since 'data' this is a model object, we include all properties including those inherited from its prototype
+ var input = document.createElement("input");
+ input.type = "hidden";
+ input.name = key;
+ input.value = ko.utils.stringifyJson(ko.utils.unwrapObservable(data[key]));
+ form.appendChild(input);
+ }
+ objectForEach(params, function(key, value) {
+ var input = document.createElement("input");
+ input.type = "hidden";
+ input.name = key;
+ input.value = value;
+ form.appendChild(input);
+ });
+ document.body.appendChild(form);
+ options['submitter'] ? options['submitter'](form) : form.submit();
+ setTimeout(function () { form.parentNode.removeChild(form); }, 0);
+ }
+ }
+}());
+
+ko.exportSymbol('utils', ko.utils);
+ko.exportSymbol('utils.arrayForEach', ko.utils.arrayForEach);
+ko.exportSymbol('utils.arrayFirst', ko.utils.arrayFirst);
+ko.exportSymbol('utils.arrayFilter', ko.utils.arrayFilter);
+ko.exportSymbol('utils.arrayGetDistinctValues', ko.utils.arrayGetDistinctValues);
+ko.exportSymbol('utils.arrayIndexOf', ko.utils.arrayIndexOf);
+ko.exportSymbol('utils.arrayMap', ko.utils.arrayMap);
+ko.exportSymbol('utils.arrayPushAll', ko.utils.arrayPushAll);
+ko.exportSymbol('utils.arrayRemoveItem', ko.utils.arrayRemoveItem);
+ko.exportSymbol('utils.extend', ko.utils.extend);
+ko.exportSymbol('utils.fieldsIncludedWithJsonPost', ko.utils.fieldsIncludedWithJsonPost);
+ko.exportSymbol('utils.getFormFields', ko.utils.getFormFields);
+ko.exportSymbol('utils.peekObservable', ko.utils.peekObservable);
+ko.exportSymbol('utils.postJson', ko.utils.postJson);
+ko.exportSymbol('utils.parseJson', ko.utils.parseJson);
+ko.exportSymbol('utils.registerEventHandler', ko.utils.registerEventHandler);
+ko.exportSymbol('utils.stringifyJson', ko.utils.stringifyJson);
+ko.exportSymbol('utils.range', ko.utils.range);
+ko.exportSymbol('utils.toggleDomNodeCssClass', ko.utils.toggleDomNodeCssClass);
+ko.exportSymbol('utils.triggerEvent', ko.utils.triggerEvent);
+ko.exportSymbol('utils.unwrapObservable', ko.utils.unwrapObservable);
+ko.exportSymbol('utils.objectForEach', ko.utils.objectForEach);
+ko.exportSymbol('utils.addOrRemoveItem', ko.utils.addOrRemoveItem);
+ko.exportSymbol('utils.setTextContent', ko.utils.setTextContent);
+ko.exportSymbol('unwrap', ko.utils.unwrapObservable); // Convenient shorthand, because this is used so commonly
+
+if (!Function.prototype['bind']) {
+ // Function.prototype.bind is a standard part of ECMAScript 5th Edition (December 2009, http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-262.pdf)
+ // In case the browser doesn't implement it natively, provide a JavaScript implementation. This implementation is based on the one in prototype.js
+ Function.prototype['bind'] = function (object) {
+ var originalFunction = this;
+ if (arguments.length === 1) {
+ return function () {
+ return originalFunction.apply(object, arguments);
+ };
+ } else {
+ var partialArgs = Array.prototype.slice.call(arguments, 1);
+ return function () {
+ var args = partialArgs.slice(0);
+ args.push.apply(args, arguments);
+ return originalFunction.apply(object, args);
+ };
+ }
+ };
+}
+
+ko.utils.domData = new (function () {
+ var uniqueId = 0;
+ var dataStoreKeyExpandoPropertyName = "__ko__" + (new Date).getTime();
+ var dataStore = {};
+
+ function getAll(node, createIfNotFound) {
+ var dataStoreKey = node[dataStoreKeyExpandoPropertyName];
+ var hasExistingDataStore = dataStoreKey && (dataStoreKey !== "null") && dataStore[dataStoreKey];
+ if (!hasExistingDataStore) {
+ if (!createIfNotFound)
+ return undefined;
+ dataStoreKey = node[dataStoreKeyExpandoPropertyName] = "ko" + uniqueId++;
+ dataStore[dataStoreKey] = {};
+ }
+ return dataStore[dataStoreKey];
+ }
+
+ return {
+ get: function (node, key) {
+ var allDataForNode = getAll(node, false);
+ return allDataForNode === undefined ? undefined : allDataForNode[key];
+ },
+ set: function (node, key, value) {
+ if (value === undefined) {
+ // Make sure we don't actually create a new domData key if we are actually deleting a value
+ if (getAll(node, false) === undefined)
+ return;
+ }
+ var allDataForNode = getAll(node, true);
+ allDataForNode[key] = value;
+ },
+ clear: function (node) {
+ var dataStoreKey = node[dataStoreKeyExpandoPropertyName];
+ if (dataStoreKey) {
+ delete dataStore[dataStoreKey];
+ node[dataStoreKeyExpandoPropertyName] = null;
+ return true; // Exposing "did clean" flag purely so specs can infer whether things have been cleaned up as intended
+ }
+ return false;
+ },
+
+ nextKey: function () {
+ return (uniqueId++) + dataStoreKeyExpandoPropertyName;
+ }
+ };
+})();
+
+ko.exportSymbol('utils.domData', ko.utils.domData);
+ko.exportSymbol('utils.domData.clear', ko.utils.domData.clear); // Exporting only so specs can clear up after themselves fully
+
+ko.utils.domNodeDisposal = new (function () {
+ var domDataKey = ko.utils.domData.nextKey();
+ var cleanableNodeTypes = { 1: true, 8: true, 9: true }; // Element, Comment, Document
+ var cleanableNodeTypesWithDescendants = { 1: true, 9: true }; // Element, Document
+
+ function getDisposeCallbacksCollection(node, createIfNotFound) {
+ var allDisposeCallbacks = ko.utils.domData.get(node, domDataKey);
+ if ((allDisposeCallbacks === undefined) && createIfNotFound) {
+ allDisposeCallbacks = [];
+ ko.utils.domData.set(node, domDataKey, allDisposeCallbacks);
+ }
+ return allDisposeCallbacks;
+ }
+ function destroyCallbacksCollection(node) {
+ ko.utils.domData.set(node, domDataKey, undefined);
+ }
+
+ function cleanSingleNode(node) {
+ // Run all the dispose callbacks
+ var callbacks = getDisposeCallbacksCollection(node, false);
+ if (callbacks) {
+ callbacks = callbacks.slice(0); // Clone, as the array may be modified during iteration (typically, callbacks will remove themselves)
+ for (var i = 0; i < callbacks.length; i++)
+ callbacks[i](node);
+ }
+
+ // Erase the DOM data
+ ko.utils.domData.clear(node);
+
+ // Perform cleanup needed by external libraries (currently only jQuery, but can be extended)
+ ko.utils.domNodeDisposal["cleanExternalData"](node);
+
+ // Clear any immediate-child comment nodes, as these wouldn't have been found by
+ // node.getElementsByTagName("*") in cleanNode() (comment nodes aren't elements)
+ if (cleanableNodeTypesWithDescendants[node.nodeType])
+ cleanImmediateCommentTypeChildren(node);
+ }
+
+ function cleanImmediateCommentTypeChildren(nodeWithChildren) {
+ var child, nextChild = nodeWithChildren.firstChild;
+ while (child = nextChild) {
+ nextChild = child.nextSibling;
+ if (child.nodeType === 8)
+ cleanSingleNode(child);
+ }
+ }
+
+ return {
+ addDisposeCallback : function(node, callback) {
+ if (typeof callback != "function")
+ throw new Error("Callback must be a function");
+ getDisposeCallbacksCollection(node, true).push(callback);
+ },
+
+ removeDisposeCallback : function(node, callback) {
+ var callbacksCollection = getDisposeCallbacksCollection(node, false);
+ if (callbacksCollection) {
+ ko.utils.arrayRemoveItem(callbacksCollection, callback);
+ if (callbacksCollection.length == 0)
+ destroyCallbacksCollection(node);
+ }
+ },
+
+ cleanNode : function(node) {
+ // First clean this node, where applicable
+ if (cleanableNodeTypes[node.nodeType]) {
+ cleanSingleNode(node);
+
+ // ... then its descendants, where applicable
+ if (cleanableNodeTypesWithDescendants[node.nodeType]) {
+ // Clone the descendants list in case it changes during iteration
+ var descendants = [];
+ ko.utils.arrayPushAll(descendants, node.getElementsByTagName("*"));
+ for (var i = 0, j = descendants.length; i < j; i++)
+ cleanSingleNode(descendants[i]);
+ }
+ }
+ return node;
+ },
+
+ removeNode : function(node) {
+ ko.cleanNode(node);
+ if (node.parentNode)
+ node.parentNode.removeChild(node);
+ },
+
+ "cleanExternalData" : function (node) {
+ // Special support for jQuery here because it's so commonly used.
+ // Many jQuery plugins (including jquery.tmpl) store data using jQuery's equivalent of domData
+ // so notify it to tear down any resources associated with the node & descendants here.
+ if (jQueryInstance && (typeof jQueryInstance['cleanData'] == "function"))
+ jQueryInstance['cleanData']([node]);
+ }
+ };
+})();
+ko.cleanNode = ko.utils.domNodeDisposal.cleanNode; // Shorthand name for convenience
+ko.removeNode = ko.utils.domNodeDisposal.removeNode; // Shorthand name for convenience
+ko.exportSymbol('cleanNode', ko.cleanNode);
+ko.exportSymbol('removeNode', ko.removeNode);
+ko.exportSymbol('utils.domNodeDisposal', ko.utils.domNodeDisposal);
+ko.exportSymbol('utils.domNodeDisposal.addDisposeCallback', ko.utils.domNodeDisposal.addDisposeCallback);
+ko.exportSymbol('utils.domNodeDisposal.removeDisposeCallback', ko.utils.domNodeDisposal.removeDisposeCallback);
+(function () {
+ var leadingCommentRegex = /^(\s*)<!--(.*?)-->/;
+
+ function simpleHtmlParse(html, documentContext) {
+ documentContext || (documentContext = document);
+ var windowContext = documentContext['parentWindow'] || documentContext['defaultView'] || window;
+
+ // Based on jQuery's "clean" function, but only accounting for table-related elements.
+ // If you have referenced jQuery, this won't be used anyway - KO will use jQuery's "clean" function directly
+
+ // Note that there's still an issue in IE < 9 whereby it will discard comment nodes that are the first child of
+ // a descendant node. For example: "<div><!-- mycomment -->abc</div>" will get parsed as "<div>abc</div>"
+ // This won't affect anyone who has referenced jQuery, and there's always the workaround of inserting a dummy node
+ // (possibly a text node) in front of the comment. So, KO does not attempt to workaround this IE issue automatically at present.
+
+ // Trim whitespace, otherwise indexOf won't work as expected
+ var tags = ko.utils.stringTrim(html).toLowerCase(), div = documentContext.createElement("div");
+
+ // Finds the first match from the left column, and returns the corresponding "wrap" data from the right column
+ var wrap = tags.match(/^<(thead|tbody|tfoot)/) && [1, "<table>", "</table>"] ||
+ !tags.indexOf("<tr") && [2, "<table><tbody>", "</tbody></table>"] ||
+ (!tags.indexOf("<td") || !tags.indexOf("<th")) && [3, "<table><tbody><tr>", "</tr></tbody></table>"] ||
+ /* anything else */ [0, "", ""];
+
+ // Go to html and back, then peel off extra wrappers
+ // Note that we always prefix with some dummy text, because otherwise, IE<9 will strip out leading comment nodes in descendants. Total madness.
+ var markup = "ignored<div>" + wrap[1] + html + wrap[2] + "</div>";
+ if (typeof windowContext['innerShiv'] == "function") {
+ div.appendChild(windowContext['innerShiv'](markup));
+ } else {
+ div.innerHTML = markup;
+ }
+
+ // Move to the right depth
+ while (wrap[0]--)
+ div = div.lastChild;
+
+ return ko.utils.makeArray(div.lastChild.childNodes);
+ }
+
+ function jQueryHtmlParse(html, documentContext) {
+ // jQuery's "parseHTML" function was introduced in jQuery 1.8.0 and is a documented public API.
+ if (jQueryInstance['parseHTML']) {
+ return jQueryInstance['parseHTML'](html, documentContext) || []; // Ensure we always return an array and never null
+ } else {
+ // For jQuery < 1.8.0, we fall back on the undocumented internal "clean" function.
+ var elems = jQueryInstance['clean']([html], documentContext);
+
+ // As of jQuery 1.7.1, jQuery parses the HTML by appending it to some dummy parent nodes held in an in-memory document fragment.
+ // Unfortunately, it never clears the dummy parent nodes from the document fragment, so it leaks memory over time.
+ // Fix this by finding the top-most dummy parent element, and detaching it from its owner fragment.
+ if (elems && elems[0]) {
+ // Find the top-most parent element that's a direct child of a document fragment
+ var elem = elems[0];
+ while (elem.parentNode && elem.parentNode.nodeType !== 11 /* i.e., DocumentFragment */)
+ elem = elem.parentNode;
+ // ... then detach it
+ if (elem.parentNode)
+ elem.parentNode.removeChild(elem);
+ }
+
+ return elems;
+ }
+ }
+
+ ko.utils.parseHtmlFragment = function(html, documentContext) {
+ return jQueryInstance ? jQueryHtmlParse(html, documentContext) // As below, benefit from jQuery's optimisations where possible
+ : simpleHtmlParse(html, documentContext); // ... otherwise, this simple logic will do in most common cases.
+ };
+
+ ko.utils.setHtml = function(node, html) {
+ ko.utils.emptyDomNode(node);
+
+ // There's no legitimate reason to display a stringified observable without unwrapping it, so we'll unwrap it
+ html = ko.utils.unwrapObservable(html);
+
+ if ((html !== null) && (html !== undefined)) {
+ if (typeof html != 'string')
+ html = html.toString();
+
+ // jQuery contains a lot of sophisticated code to parse arbitrary HTML fragments,
+ // for example <tr> elements which are not normally allowed to exist on their own.
+ // If you've referenced jQuery we'll use that rather than duplicating its code.
+ if (jQueryInstance) {
+ jQueryInstance(node)['html'](html);
+ } else {
+ // ... otherwise, use KO's own parsing logic.
+ var parsedNodes = ko.utils.parseHtmlFragment(html, node.ownerDocument);
+ for (var i = 0; i < parsedNodes.length; i++)
+ node.appendChild(parsedNodes[i]);
+ }
+ }
+ };
+})();
+
+ko.exportSymbol('utils.parseHtmlFragment', ko.utils.parseHtmlFragment);
+ko.exportSymbol('utils.setHtml', ko.utils.setHtml);
+
+ko.memoization = (function () {
+ var memos = {};
+
+ function randomMax8HexChars() {
+ return (((1 + Math.random()) * 0x100000000) | 0).toString(16).substring(1);
+ }
+ function generateRandomId() {
+ return randomMax8HexChars() + randomMax8HexChars();
+ }
+ function findMemoNodes(rootNode, appendToArray) {
+ if (!rootNode)
+ return;
+ if (rootNode.nodeType == 8) {
+ var memoId = ko.memoization.parseMemoText(rootNode.nodeValue);
+ if (memoId != null)
+ appendToArray.push({ domNode: rootNode, memoId: memoId });
+ } else if (rootNode.nodeType == 1) {
+ for (var i = 0, childNodes = rootNode.childNodes, j = childNodes.length; i < j; i++)
+ findMemoNodes(childNodes[i], appendToArray);
+ }
+ }
+
+ return {
+ memoize: function (callback) {
+ if (typeof callback != "function")
+ throw new Error("You can only pass a function to ko.memoization.memoize()");
+ var memoId = generateRandomId();
+ memos[memoId] = callback;
+ return "<!--[ko_memo:" + memoId + "]-->";
+ },
+
+ unmemoize: function (memoId, callbackParams) {
+ var callback = memos[memoId];
+ if (callback === undefined)
+ throw new Error("Couldn't find any memo with ID " + memoId + ". Perhaps it's already been unmemoized.");
+ try {
+ callback.apply(null, callbackParams || []);
+ return true;
+ }
+ finally { delete memos[memoId]; }
+ },
+
+ unmemoizeDomNodeAndDescendants: function (domNode, extraCallbackParamsArray) {
+ var memos = [];
+ findMemoNodes(domNode, memos);
+ for (var i = 0, j = memos.length; i < j; i++) {
+ var node = memos[i].domNode;
+ var combinedParams = [node];
+ if (extraCallbackParamsArray)
+ ko.utils.arrayPushAll(combinedParams, extraCallbackParamsArray);
+ ko.memoization.unmemoize(memos[i].memoId, combinedParams);
+ node.nodeValue = ""; // Neuter this node so we don't try to unmemoize it again
+ if (node.parentNode)
+ node.parentNode.removeChild(node); // If possible, erase it totally (not always possible - someone else might just hold a reference to it then call unmemoizeDomNodeAndDescendants again)
+ }
+ },
+
+ parseMemoText: function (memoText) {
+ var match = memoText.match(/^\[ko_memo\:(.*?)\]$/);
+ return match ? match[1] : null;
+ }
+ };
+})();
+
+ko.exportSymbol('memoization', ko.memoization);
+ko.exportSymbol('memoization.memoize', ko.memoization.memoize);
+ko.exportSymbol('memoization.unmemoize', ko.memoization.unmemoize);
+ko.exportSymbol('memoization.parseMemoText', ko.memoization.parseMemoText);
+ko.exportSymbol('memoization.unmemoizeDomNodeAndDescendants', ko.memoization.unmemoizeDomNodeAndDescendants);
+ko.extenders = {
+ 'throttle': function(target, timeout) {
+ // Throttling means two things:
+
+ // (1) For dependent observables, we throttle *evaluations* so that, no matter how fast its dependencies
+ // notify updates, the target doesn't re-evaluate (and hence doesn't notify) faster than a certain rate
+ target['throttleEvaluation'] = timeout;
+
+ // (2) For writable targets (observables, or writable dependent observables), we throttle *writes*
+ // so the target cannot change value synchronously or faster than a certain rate
+ var writeTimeoutInstance = null;
+ return ko.dependentObservable({
+ 'read': target,
+ 'write': function(value) {
+ clearTimeout(writeTimeoutInstance);
+ writeTimeoutInstance = setTimeout(function() {
+ target(value);
+ }, timeout);
+ }
+ });
+ },
+
+ 'rateLimit': function(target, options) {
+ var timeout, method, limitFunction;
+
+ if (typeof options == 'number') {
+ timeout = options;
+ } else {
+ timeout = options['timeout'];
+ method = options['method'];
+ }
+
+ limitFunction = method == 'notifyWhenChangesStop' ? debounce : throttle;
+ target.limit(function(callback) {
+ return limitFunction(callback, timeout);
+ });
+ },
+
+ 'notify': function(target, notifyWhen) {
+ target["equalityComparer"] = notifyWhen == "always" ?
+ null : // null equalityComparer means to always notify
+ valuesArePrimitiveAndEqual;
+ }
+};
+
+var primitiveTypes = { 'undefined':1, 'boolean':1, 'number':1, 'string':1 };
+function valuesArePrimitiveAndEqual(a, b) {
+ var oldValueIsPrimitive = (a === null) || (typeof(a) in primitiveTypes);
+ return oldValueIsPrimitive ? (a === b) : false;
+}
+
+function throttle(callback, timeout) {
+ var timeoutInstance;
+ return function () {
+ if (!timeoutInstance) {
+ timeoutInstance = setTimeout(function() {
+ timeoutInstance = undefined;
+ callback();
+ }, timeout);
+ }
+ };
+}
+
+function debounce(callback, timeout) {
+ var timeoutInstance;
+ return function () {
+ clearTimeout(timeoutInstance);
+ timeoutInstance = setTimeout(callback, timeout);
+ };
+}
+
+function applyExtenders(requestedExtenders) {
+ var target = this;
+ if (requestedExtenders) {
+ ko.utils.objectForEach(requestedExtenders, function(key, value) {
+ var extenderHandler = ko.extenders[key];
+ if (typeof extenderHandler == 'function') {
+ target = extenderHandler(target, value) || target;
+ }
+ });
+ }
+ return target;
+}
+
+ko.exportSymbol('extenders', ko.extenders);
+
+ko.subscription = function (target, callback, disposeCallback) {
+ this._target = target;
+ this.callback = callback;
+ this.disposeCallback = disposeCallback;
+ this.isDisposed = false;
+ ko.exportProperty(this, 'dispose', this.dispose);
+};
+ko.subscription.prototype.dispose = function () {
+ this.isDisposed = true;
+ this.disposeCallback();
+};
+
+ko.subscribable = function () {
+ ko.utils.setPrototypeOfOrExtend(this, ko.subscribable['fn']);
+ this._subscriptions = {};
+ this._versionNumber = 1;
+}
+
+var defaultEvent = "change";
+
+var ko_subscribable_fn = {
+ subscribe: function (callback, callbackTarget, event) {
+ var self = this;
+
+ event = event || defaultEvent;
+ var boundCallback = callbackTarget ? callback.bind(callbackTarget) : callback;
+
+ var subscription = new ko.subscription(self, boundCallback, function () {
+ ko.utils.arrayRemoveItem(self._subscriptions[event], subscription);
+ if (self.afterSubscriptionRemove)
+ self.afterSubscriptionRemove(event);
+ });
+
+ if (self.beforeSubscriptionAdd)
+ self.beforeSubscriptionAdd(event);
+
+ if (!self._subscriptions[event])
+ self._subscriptions[event] = [];
+ self._subscriptions[event].push(subscription);
+
+ return subscription;
+ },
+
+ "notifySubscribers": function (valueToNotify, event) {
+ event = event || defaultEvent;
+ if (event === defaultEvent) {
+ this.updateVersion();
+ }
+ if (this.hasSubscriptionsForEvent(event)) {
+ try {
+ ko.dependencyDetection.begin(); // Begin suppressing dependency detection (by setting the top frame to undefined)
+ for (var a = this._subscriptions[event].slice(0), i = 0, subscription; subscription = a[i]; ++i) {
+ // In case a subscription was disposed during the arrayForEach cycle, check
+ // for isDisposed on each subscription before invoking its callback
+ if (!subscription.isDisposed)
+ subscription.callback(valueToNotify);
+ }
+ } finally {
+ ko.dependencyDetection.end(); // End suppressing dependency detection
+ }
+ }
+ },
+
+ getVersion: function () {
+ return this._versionNumber;
+ },
+
+ hasChanged: function (versionToCheck) {
+ return this.getVersion() !== versionToCheck;
+ },
+
+ updateVersion: function () {
+ ++this._versionNumber;
+ },
+
+ limit: function(limitFunction) {
+ var self = this, selfIsObservable = ko.isObservable(self),
+ isPending, previousValue, pendingValue, beforeChange = 'beforeChange';
+
+ if (!self._origNotifySubscribers) {
+ self._origNotifySubscribers = self["notifySubscribers"];
+ self["notifySubscribers"] = function(value, event) {
+ if (!event || event === defaultEvent) {
+ self._rateLimitedChange(value);
+ } else if (event === beforeChange) {
+ self._rateLimitedBeforeChange(value);
+ } else {
+ self._origNotifySubscribers(value, event);
+ }
+ };
+ }
+
+ var finish = limitFunction(function() {
+ // If an observable provided a reference to itself, access it to get the latest value.
+ // This allows computed observables to delay calculating their value until needed.
+ if (selfIsObservable && pendingValue === self) {
+ pendingValue = self();
+ }
+ isPending = false;
+ if (self.isDifferent(previousValue, pendingValue)) {
+ self._origNotifySubscribers(previousValue = pendingValue);
+ }
+ });
+
+ self._rateLimitedChange = function(value) {
+ isPending = true;
+ pendingValue = value;
+ finish();
+ };
+ self._rateLimitedBeforeChange = function(value) {
+ if (!isPending) {
+ previousValue = value;
+ self._origNotifySubscribers(value, beforeChange);
+ }
+ };
+ },
+
+ hasSubscriptionsForEvent: function(event) {
+ return this._subscriptions[event] && this._subscriptions[event].length;
+ },
+
+ getSubscriptionsCount: function (event) {
+ if (event) {
+ return this._subscriptions[event] && this._subscriptions[event].length || 0;
+ } else {
+ var total = 0;
+ ko.utils.objectForEach(this._subscriptions, function(eventName, subscriptions) {
+ total += subscriptions.length;
+ });
+ return total;
+ }
+ },
+
+ isDifferent: function(oldValue, newValue) {
+ return !this['equalityComparer'] || !this['equalityComparer'](oldValue, newValue);
+ },
+
+ extend: applyExtenders
+};
+
+ko.exportProperty(ko_subscribable_fn, 'subscribe', ko_subscribable_fn.subscribe);
+ko.exportProperty(ko_subscribable_fn, 'extend', ko_subscribable_fn.extend);
+ko.exportProperty(ko_subscribable_fn, 'getSubscriptionsCount', ko_subscribable_fn.getSubscriptionsCount);
+
+// For browsers that support proto assignment, we overwrite the prototype of each
+// observable instance. Since observables are functions, we need Function.prototype
+// to still be in the prototype chain.
+if (ko.utils.canSetPrototype) {
+ ko.utils.setPrototypeOf(ko_subscribable_fn, Function.prototype);
+}
+
+ko.subscribable['fn'] = ko_subscribable_fn;
+
+
+ko.isSubscribable = function (instance) {
+ return instance != null && typeof instance.subscribe == "function" && typeof instance["notifySubscribers"] == "function";
+};
+
+ko.exportSymbol('subscribable', ko.subscribable);
+ko.exportSymbol('isSubscribable', ko.isSubscribable);
+
+ko.computedContext = ko.dependencyDetection = (function () {
+ var outerFrames = [],
+ currentFrame,
+ lastId = 0;
+
+ // Return a unique ID that can be assigned to an observable for dependency tracking.
+ // Theoretically, you could eventually overflow the number storage size, resulting
+ // in duplicate IDs. But in JavaScript, the largest exact integral value is 2^53
+ // or 9,007,199,254,740,992. If you created 1,000,000 IDs per second, it would
+ // take over 285 years to reach that number.
+ // Reference http://blog.vjeux.com/2010/javascript/javascript-max_int-number-limits.html
+ function getId() {
+ return ++lastId;
+ }
+
+ function begin(options) {
+ outerFrames.push(currentFrame);
+ currentFrame = options;
+ }
+
+ function end() {
+ currentFrame = outerFrames.pop();
+ }
+
+ return {
+ begin: begin,
+
+ end: end,
+
+ registerDependency: function (subscribable) {
+ if (currentFrame) {
+ if (!ko.isSubscribable(subscribable))
+ throw new Error("Only subscribable things can act as dependencies");
+ currentFrame.callback(subscribable, subscribable._id || (subscribable._id = getId()));
+ }
+ },
+
+ ignore: function (callback, callbackTarget, callbackArgs) {
+ try {
+ begin();
+ return callback.apply(callbackTarget, callbackArgs || []);
+ } finally {
+ end();
+ }
+ },
+
+ getDependenciesCount: function () {
+ if (currentFrame)
+ return currentFrame.computed.getDependenciesCount();
+ },
+
+ isInitial: function() {
+ if (currentFrame)
+ return currentFrame.isInitial;
+ }
+ };
+})();
+
+ko.exportSymbol('computedContext', ko.computedContext);
+ko.exportSymbol('computedContext.getDependenciesCount', ko.computedContext.getDependenciesCount);
+ko.exportSymbol('computedContext.isInitial', ko.computedContext.isInitial);
+ko.exportSymbol('computedContext.isSleeping', ko.computedContext.isSleeping);
+
+ko.exportSymbol('ignoreDependencies', ko.ignoreDependencies = ko.dependencyDetection.ignore);
+ko.observable = function (initialValue) {
+ var _latestValue = initialValue;
+
+ function observable() {
+ if (arguments.length > 0) {
+ // Write
+
+ // Ignore writes if the value hasn't changed
+ if (observable.isDifferent(_latestValue, arguments[0])) {
+ observable.valueWillMutate();
+ _latestValue = arguments[0];
+ if (DEBUG) observable._latestValue = _latestValue;
+ observable.valueHasMutated();
+ }
+ return this; // Permits chained assignments
+ }
+ else {
+ // Read
+ ko.dependencyDetection.registerDependency(observable); // The caller only needs to be notified of changes if they did a "read" operation
+ return _latestValue;
+ }
+ }
+ ko.subscribable.call(observable);
+ ko.utils.setPrototypeOfOrExtend(observable, ko.observable['fn']);
+
+ if (DEBUG) observable._latestValue = _latestValue;
+ observable.peek = function() { return _latestValue };
+ observable.valueHasMutated = function () { observable["notifySubscribers"](_latestValue); }
+ observable.valueWillMutate = function () { observable["notifySubscribers"](_latestValue, "beforeChange"); }
+
+ ko.exportProperty(observable, 'peek', observable.peek);
+ ko.exportProperty(observable, "valueHasMutated", observable.valueHasMutated);
+ ko.exportProperty(observable, "valueWillMutate", observable.valueWillMutate);
+
+ return observable;
+}
+
+ko.observable['fn'] = {
+ "equalityComparer": valuesArePrimitiveAndEqual
+};
+
+var protoProperty = ko.observable.protoProperty = "__ko_proto__";
+ko.observable['fn'][protoProperty] = ko.observable;
+
+// Note that for browsers that don't support proto assignment, the
+// inheritance chain is created manually in the ko.observable constructor
+if (ko.utils.canSetPrototype) {
+ ko.utils.setPrototypeOf(ko.observable['fn'], ko.subscribable['fn']);
+}
+
+ko.hasPrototype = function(instance, prototype) {
+ if ((instance === null) || (instance === undefined) || (instance[protoProperty] === undefined)) return false;
+ if (instance[protoProperty] === prototype) return true;
+ return ko.hasPrototype(instance[protoProperty], prototype); // Walk the prototype chain
+};
+
+ko.isObservable = function (instance) {
+ return ko.hasPrototype(instance, ko.observable);
+}
+ko.isWriteableObservable = function (instance) {
+ // Observable
+ if ((typeof instance == "function") && instance[protoProperty] === ko.observable)
+ return true;
+ // Writeable dependent observable
+ if ((typeof instance == "function") && (instance[protoProperty] === ko.dependentObservable) && (instance.hasWriteFunction))
+ return true;
+ // Anything else
+ return false;
+}
+
+
+ko.exportSymbol('observable', ko.observable);
+ko.exportSymbol('isObservable', ko.isObservable);
+ko.exportSymbol('isWriteableObservable', ko.isWriteableObservable);
+ko.exportSymbol('isWritableObservable', ko.isWriteableObservable);
+ko.observableArray = function (initialValues) {
+ initialValues = initialValues || [];
+
+ if (typeof initialValues != 'object' || !('length' in initialValues))
+ throw new Error("The argument passed when initializing an observable array must be an array, or null, or undefined.");
+
+ var result = ko.observable(initialValues);
+ ko.utils.setPrototypeOfOrExtend(result, ko.observableArray['fn']);
+ return result.extend({'trackArrayChanges':true});
+};
+
+ko.observableArray['fn'] = {
+ 'remove': function (valueOrPredicate) {
+ var underlyingArray = this.peek();
+ var removedValues = [];
+ var predicate = typeof valueOrPredicate == "function" && !ko.isObservable(valueOrPredicate) ? valueOrPredicate : function (value) { return value === valueOrPredicate; };
+ for (var i = 0; i < underlyingArray.length; i++) {
+ var value = underlyingArray[i];
+ if (predicate(value)) {
+ if (removedValues.length === 0) {
+ this.valueWillMutate();
+ }
+ removedValues.push(value);
+ underlyingArray.splice(i, 1);
+ i--;
+ }
+ }
+ if (removedValues.length) {
+ this.valueHasMutated();
+ }
+ return removedValues;
+ },
+
+ 'removeAll': function (arrayOfValues) {
+ // If you passed zero args, we remove everything
+ if (arrayOfValues === undefined) {
+ var underlyingArray = this.peek();
+ var allValues = underlyingArray.slice(0);
+ this.valueWillMutate();
+ underlyingArray.splice(0, underlyingArray.length);
+ this.valueHasMutated();
+ return allValues;
+ }
+ // If you passed an arg, we interpret it as an array of entries to remove
+ if (!arrayOfValues)
+ return [];
+ return this['remove'](function (value) {
+ return ko.utils.arrayIndexOf(arrayOfValues, value) >= 0;
+ });
+ },
+
+ 'destroy': function (valueOrPredicate) {
+ var underlyingArray = this.peek();
+ var predicate = typeof valueOrPredicate == "function" && !ko.isObservable(valueOrPredicate) ? valueOrPredicate : function (value) { return value === valueOrPredicate; };
+ this.valueWillMutate();
+ for (var i = underlyingArray.length - 1; i >= 0; i--) {
+ var value = underlyingArray[i];
+ if (predicate(value))
+ underlyingArray[i]["_destroy"] = true;
+ }
+ this.valueHasMutated();
+ },
+
+ 'destroyAll': function (arrayOfValues) {
+ // If you passed zero args, we destroy everything
+ if (arrayOfValues === undefined)
+ return this['destroy'](function() { return true });
+
+ // If you passed an arg, we interpret it as an array of entries to destroy
+ if (!arrayOfValues)
+ return [];
+ return this['destroy'](function (value) {
+ return ko.utils.arrayIndexOf(arrayOfValues, value) >= 0;
+ });
+ },
+
+ 'indexOf': function (item) {
+ var underlyingArray = this();
+ return ko.utils.arrayIndexOf(underlyingArray, item);
+ },
+
+ 'replace': function(oldItem, newItem) {
+ var index = this['indexOf'](oldItem);
+ if (index >= 0) {
+ this.valueWillMutate();
+ this.peek()[index] = newItem;
+ this.valueHasMutated();
+ }
+ }
+};
+
+// Populate ko.observableArray.fn with read/write functions from native arrays
+// Important: Do not add any additional functions here that may reasonably be used to *read* data from the array
+// because we'll eval them without causing subscriptions, so ko.computed output could end up getting stale
+ko.utils.arrayForEach(["pop", "push", "reverse", "shift", "sort", "splice", "unshift"], function (methodName) {
+ ko.observableArray['fn'][methodName] = function () {
+ // Use "peek" to avoid creating a subscription in any computed that we're executing in the context of
+ // (for consistency with mutating regular observables)
+ var underlyingArray = this.peek();
+ this.valueWillMutate();
+ this.cacheDiffForKnownOperation(underlyingArray, methodName, arguments);
+ var methodCallResult = underlyingArray[methodName].apply(underlyingArray, arguments);
+ this.valueHasMutated();
+ return methodCallResult;
+ };
+});
+
+// Populate ko.observableArray.fn with read-only functions from native arrays
+ko.utils.arrayForEach(["slice"], function (methodName) {
+ ko.observableArray['fn'][methodName] = function () {
+ var underlyingArray = this();
+ return underlyingArray[methodName].apply(underlyingArray, arguments);
+ };
+});
+
+// Note that for browsers that don't support proto assignment, the
+// inheritance chain is created manually in the ko.observableArray constructor
+if (ko.utils.canSetPrototype) {
+ ko.utils.setPrototypeOf(ko.observableArray['fn'], ko.observable['fn']);
+}
+
+ko.exportSymbol('observableArray', ko.observableArray);
+var arrayChangeEventName = 'arrayChange';
+ko.extenders['trackArrayChanges'] = function(target) {
+ // Only modify the target observable once
+ if (target.cacheDiffForKnownOperation) {
+ return;
+ }
+ var trackingChanges = false,
+ cachedDiff = null,
+ arrayChangeSubscription,
+ pendingNotifications = 0,
+ underlyingBeforeSubscriptionAddFunction = target.beforeSubscriptionAdd,
+ underlyingAfterSubscriptionRemoveFunction = target.afterSubscriptionRemove;
+
+ // Watch "subscribe" calls, and for array change events, ensure change tracking is enabled
+ target.beforeSubscriptionAdd = function (event) {
+ if (underlyingBeforeSubscriptionAddFunction)
+ underlyingBeforeSubscriptionAddFunction.call(target, event);
+ if (event === arrayChangeEventName) {
+ trackChanges();
+ }
+ };
+ // Watch "dispose" calls, and for array change events, ensure change tracking is disabled when all are disposed
+ target.afterSubscriptionRemove = function (event) {
+ if (underlyingAfterSubscriptionRemoveFunction)
+ underlyingAfterSubscriptionRemoveFunction.call(target, event);
+ if (event === arrayChangeEventName && !target.hasSubscriptionsForEvent(arrayChangeEventName)) {
+ arrayChangeSubscription.dispose();
+ trackingChanges = false;
+ }
+ };
+
+ function trackChanges() {
+ // Calling 'trackChanges' multiple times is the same as calling it once
+ if (trackingChanges) {
+ return;
+ }
+
+ trackingChanges = true;
+
+ // Intercept "notifySubscribers" to track how many times it was called.
+ var underlyingNotifySubscribersFunction = target['notifySubscribers'];
+ target['notifySubscribers'] = function(valueToNotify, event) {
+ if (!event || event === defaultEvent) {
+ ++pendingNotifications;
+ }
+ return underlyingNotifySubscribersFunction.apply(this, arguments);
+ };
+
+ // Each time the array changes value, capture a clone so that on the next
+ // change it's possible to produce a diff
+ var previousContents = [].concat(target.peek() || []);
+ cachedDiff = null;
+ arrayChangeSubscription = target.subscribe(function(currentContents) {
+ // Make a copy of the current contents and ensure it's an array
+ currentContents = [].concat(currentContents || []);
+
+ // Compute the diff and issue notifications, but only if someone is listening
+ if (target.hasSubscriptionsForEvent(arrayChangeEventName)) {
+ var changes = getChanges(previousContents, currentContents);
+ }
+
+ // Eliminate references to the old, removed items, so they can be GCed
+ previousContents = currentContents;
+ cachedDiff = null;
+ pendingNotifications = 0;
+
+ if (changes && changes.length) {
+ target['notifySubscribers'](changes, arrayChangeEventName);
+ }
+ });
+ }
+
+ function getChanges(previousContents, currentContents) {
+ // We try to re-use cached diffs.
+ // The scenarios where pendingNotifications > 1 are when using rate-limiting or the Deferred Updates
+ // plugin, which without this check would not be compatible with arrayChange notifications. Normally,
+ // notifications are issued immediately so we wouldn't be queueing up more than one.
+ if (!cachedDiff || pendingNotifications > 1) {
+ cachedDiff = ko.utils.compareArrays(previousContents, currentContents, { 'sparse': true });
+ }
+
+ return cachedDiff;
+ }
+
+ target.cacheDiffForKnownOperation = function(rawArray, operationName, args) {
+ // Only run if we're currently tracking changes for this observable array
+ // and there aren't any pending deferred notifications.
+ if (!trackingChanges || pendingNotifications) {
+ return;
+ }
+ var diff = [],
+ arrayLength = rawArray.length,
+ argsLength = args.length,
+ offset = 0;
+
+ function pushDiff(status, value, index) {
+ return diff[diff.length] = { 'status': status, 'value': value, 'index': index };
+ }
+ switch (operationName) {
+ case 'push':
+ offset = arrayLength;
+ case 'unshift':
+ for (var index = 0; index < argsLength; index++) {
+ pushDiff('added', args[index], offset + index);
+ }
+ break;
+
+ case 'pop':
+ offset = arrayLength - 1;
+ case 'shift':
+ if (arrayLength) {
+ pushDiff('deleted', rawArray[offset], offset);
+ }
+ break;
+
+ case 'splice':
+ // Negative start index means 'from end of array'. After that we clamp to [0...arrayLength].
+ // See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice
+ var startIndex = Math.min(Math.max(0, args[0] < 0 ? arrayLength + args[0] : args[0]), arrayLength),
+ endDeleteIndex = argsLength === 1 ? arrayLength : Math.min(startIndex + (args[1] || 0), arrayLength),
+ endAddIndex = startIndex + argsLength - 2,
+ endIndex = Math.max(endDeleteIndex, endAddIndex),
+ additions = [], deletions = [];
+ for (var index = startIndex, argsIndex = 2; index < endIndex; ++index, ++argsIndex) {
+ if (index < endDeleteIndex)
+ deletions.push(pushDiff('deleted', rawArray[index], index));
+ if (index < endAddIndex)
+ additions.push(pushDiff('added', args[argsIndex], index));
+ }
+ ko.utils.findMovesInArrayComparison(deletions, additions);
+ break;
+
+ default:
+ return;
+ }
+ cachedDiff = diff;
+ };
+};
+ko.computed = ko.dependentObservable = function (evaluatorFunctionOrOptions, evaluatorFunctionTarget, options) {
+ var _latestValue,
+ _needsEvaluation = true,
+ _isBeingEvaluated = false,
+ _suppressDisposalUntilDisposeWhenReturnsFalse = false,
+ _isDisposed = false,
+ readFunction = evaluatorFunctionOrOptions,
+ pure = false,
+ isSleeping = false;
+
+ if (readFunction && typeof readFunction == "object") {
+ // Single-parameter syntax - everything is on this "options" param
+ options = readFunction;
+ readFunction = options["read"];
+ } else {
+ // Multi-parameter syntax - construct the options according to the params passed
+ options = options || {};
+ if (!readFunction)
+ readFunction = options["read"];
+ }
+ if (typeof readFunction != "function")
+ throw new Error("Pass a function that returns the value of the ko.computed");
+
+ function addDependencyTracking(id, target, trackingObj) {
+ if (pure && target === dependentObservable) {
+ throw Error("A 'pure' computed must not be called recursively");
+ }
+
+ dependencyTracking[id] = trackingObj;
+ trackingObj._order = _dependenciesCount++;
+ trackingObj._version = target.getVersion();
+ }
+
+ function haveDependenciesChanged() {
+ var id, dependency;
+ for (id in dependencyTracking) {
+ if (dependencyTracking.hasOwnProperty(id)) {
+ dependency = dependencyTracking[id];
+ if (dependency._target.hasChanged(dependency._version)) {
+ return true;
+ }
+ }
+ }
+ }
+
+ function disposeComputed() {
+ if (!isSleeping && dependencyTracking) {
+ ko.utils.objectForEach(dependencyTracking, function (id, dependency) {
+ if (dependency.dispose)
+ dependency.dispose();
+ });
+ }
+ dependencyTracking = null;
+ _dependenciesCount = 0;
+ _isDisposed = true;
+ _needsEvaluation = false;
+ isSleeping = false;
+ }
+
+ function evaluatePossiblyAsync() {
+ var throttleEvaluationTimeout = dependentObservable['throttleEvaluation'];
+ if (throttleEvaluationTimeout && throttleEvaluationTimeout >= 0) {
+ clearTimeout(evaluationTimeoutInstance);
+ evaluationTimeoutInstance = setTimeout(function () {
+ evaluateImmediate(true /*notifyChange*/);
+ }, throttleEvaluationTimeout);
+ } else if (dependentObservable._evalRateLimited) {
+ dependentObservable._evalRateLimited();
+ } else {
+ evaluateImmediate(true /*notifyChange*/);
+ }
+ }
+
+ function evaluateImmediate(notifyChange) {
+ if (_isBeingEvaluated) {
+ // If the evaluation of a ko.computed causes side effects, it's possible that it will trigger its own re-evaluation.
+ // This is not desirable (it's hard for a developer to realise a chain of dependencies might cause this, and they almost
+ // certainly didn't intend infinite re-evaluations). So, for predictability, we simply prevent ko.computeds from causing
+ // their own re-evaluation. Further discussion at https://github.com/SteveSanderson/knockout/pull/387
+ return;
+ }
+
+ // Do not evaluate (and possibly capture new dependencies) if disposed
+ if (_isDisposed) {
+ return;
+ }
+
+ if (disposeWhen && disposeWhen()) {
+ // See comment below about _suppressDisposalUntilDisposeWhenReturnsFalse
+ if (!_suppressDisposalUntilDisposeWhenReturnsFalse) {
+ dispose();
+ return;
+ }
+ } else {
+ // It just did return false, so we can stop suppressing now
+ _suppressDisposalUntilDisposeWhenReturnsFalse = false;
+ }
+
+ _isBeingEvaluated = true;
+
+ try {
+ // Initially, we assume that none of the subscriptions are still being used (i.e., all are candidates for disposal).
+ // Then, during evaluation, we cross off any that are in fact still being used.
+ var disposalCandidates = dependencyTracking,
+ disposalCount = _dependenciesCount,
+ isInitial = pure ? undefined : !_dependenciesCount; // If we're evaluating when there are no previous dependencies, it must be the first time
+
+ ko.dependencyDetection.begin({
+ callback: function(subscribable, id) {
+ if (!_isDisposed) {
+ if (disposalCount && disposalCandidates[id]) {
+ // Don't want to dispose this subscription, as it's still being used
+ addDependencyTracking(id, subscribable, disposalCandidates[id]);
+ delete disposalCandidates[id];
+ --disposalCount;
+ } else if (!dependencyTracking[id]) {
+ // Brand new subscription - add it
+ addDependencyTracking(id, subscribable, isSleeping ? { _target: subscribable } : subscribable.subscribe(evaluatePossiblyAsync));
+ }
+ }
+ },
+ computed: dependentObservable,
+ isInitial: isInitial
+ });
+
+ dependencyTracking = {};
+ _dependenciesCount = 0;
+
+ try {
+ var newValue = evaluatorFunctionTarget ? readFunction.call(evaluatorFunctionTarget) : readFunction();
+
+ } finally {
+ ko.dependencyDetection.end();
+
+ // For each subscription no longer being used, remove it from the active subscriptions list and dispose it
+ if (disposalCount && !isSleeping) {
+ ko.utils.objectForEach(disposalCandidates, function(id, toDispose) {
+ if (toDispose.dispose)
+ toDispose.dispose();
+ });
+ }
+
+ _needsEvaluation = false;
+ }
+
+ if (dependentObservable.isDifferent(_latestValue, newValue)) {
+ if (!isSleeping) {
+ notify(_latestValue, "beforeChange");
+ }
+
+ _latestValue = newValue;
+ if (DEBUG) dependentObservable._latestValue = _latestValue;
+
+ if (isSleeping) {
+ dependentObservable.updateVersion();
+ } else if (notifyChange) {
+ notify(_latestValue);
+ }
+ }
+
+ if (isInitial) {
+ notify(_latestValue, "awake");
+ }
+ } finally {
+ _isBeingEvaluated = false;
+ }
+
+ if (!_dependenciesCount)
+ dispose();
+ }
+
+ function dependentObservable() {
+ if (arguments.length > 0) {
+ if (typeof writeFunction === "function") {
+ // Writing a value
+ writeFunction.apply(evaluatorFunctionTarget, arguments);
+ } else {
+ throw new Error("Cannot write a value to a ko.computed unless you specify a 'write' option. If you wish to read the current value, don't pass any parameters.");
+ }
+ return this; // Permits chained assignments
+ } else {
+ // Reading the value
+ ko.dependencyDetection.registerDependency(dependentObservable);
+ if (_needsEvaluation || (isSleeping && haveDependenciesChanged())) {
+ evaluateImmediate();
+ }
+ return _latestValue;
+ }
+ }
+
+ function peek() {
+ // Peek won't re-evaluate, except while the computed is sleeping or to get the initial value when "deferEvaluation" is set.
+ if ((_needsEvaluation && !_dependenciesCount) || (isSleeping && haveDependenciesChanged())) {
+ evaluateImmediate();
+ }
+ return _latestValue;
+ }
+
+ function isActive() {
+ return _needsEvaluation || _dependenciesCount > 0;
+ }
+
+ function notify(value, event) {
+ dependentObservable["notifySubscribers"](value, event);
+ }
+
+ // By here, "options" is always non-null
+ var writeFunction = options["write"],
+ disposeWhenNodeIsRemoved = options["disposeWhenNodeIsRemoved"] || options.disposeWhenNodeIsRemoved || null,
+ disposeWhenOption = options["disposeWhen"] || options.disposeWhen,
+ disposeWhen = disposeWhenOption,
+ dispose = disposeComputed,
+ dependencyTracking = {},
+ _dependenciesCount = 0,
+ evaluationTimeoutInstance = null;
+
+ if (!evaluatorFunctionTarget)
+ evaluatorFunctionTarget = options["owner"];
+
+ ko.subscribable.call(dependentObservable);
+ ko.utils.setPrototypeOfOrExtend(dependentObservable, ko.dependentObservable['fn']);
+
+ dependentObservable.peek = peek;
+ dependentObservable.getDependenciesCount = function () { return _dependenciesCount; };
+ dependentObservable.hasWriteFunction = typeof writeFunction === "function";
+ dependentObservable.dispose = function () { dispose(); };
+ dependentObservable.isActive = isActive;
+
+ // Replace the limit function with one that delays evaluation as well.
+ var originalLimit = dependentObservable.limit;
+ dependentObservable.limit = function(limitFunction) {
+ originalLimit.call(dependentObservable, limitFunction);
+ dependentObservable._evalRateLimited = function() {
+ dependentObservable._rateLimitedBeforeChange(_latestValue);
+
+ _needsEvaluation = true; // Mark as dirty
+
+ // Pass the observable to the rate-limit code, which will access it when
+ // it's time to do the notification.
+ dependentObservable._rateLimitedChange(dependentObservable);
+ }
+ };
+
+ if (options['pure']) {
+ pure = true;
+ isSleeping = true; // Starts off sleeping; will awake on the first subscription
+ dependentObservable.beforeSubscriptionAdd = function (event) {
+ // If asleep, wake up the computed by subscribing to any dependencies.
+ if (!_isDisposed && isSleeping && event == 'change') {
+ isSleeping = false;
+ if (_needsEvaluation || haveDependenciesChanged()) {
+ dependencyTracking = null;
+ _dependenciesCount = 0;
+ _needsEvaluation = true;
+ evaluateImmediate();
+ } else {
+ // First put the dependencies in order
+ var dependeciesOrder = [];
+ ko.utils.objectForEach(dependencyTracking, function (id, dependency) {
+ dependeciesOrder[dependency._order] = id;
+ });
+ // Next, subscribe to each one
+ ko.utils.arrayForEach(dependeciesOrder, function(id, order) {
+ var dependency = dependencyTracking[id],
+ subscription = dependency._target.subscribe(evaluatePossiblyAsync);
+ subscription._order = order;
+ subscription._version = dependency._version;
+ dependencyTracking[id] = subscription;
+ });
+ }
+ if (!_isDisposed) { // test since evaluating could trigger disposal
+ notify(_latestValue, "awake");
+ }
+ }
+ };
+
+ dependentObservable.afterSubscriptionRemove = function (event) {
+ if (!_isDisposed && event == 'change' && !dependentObservable.hasSubscriptionsForEvent('change')) {
+ ko.utils.objectForEach(dependencyTracking, function (id, dependency) {
+ if (dependency.dispose) {
+ dependencyTracking[id] = {
+ _target: dependency._target,
+ _order: dependency._order,
+ _version: dependency._version
+ };
+ dependency.dispose();
+ }
+ });
+ isSleeping = true;
+ notify(undefined, "asleep");
+ }
+ };
+
+ // Because a pure computed is not automatically updated while it is sleeping, we can't
+ // simply return the version number. Instead, we check if any of the dependencies have
+ // changed and conditionally re-evaluate the computed observable.
+ dependentObservable._originalGetVersion = dependentObservable.getVersion;
+ dependentObservable.getVersion = function () {
+ if (isSleeping && (_needsEvaluation || haveDependenciesChanged())) {
+ evaluateImmediate();
+ }
+ return dependentObservable._originalGetVersion();
+ };
+ } else if (options['deferEvaluation']) {
+ // This will force a computed with deferEvaluation to evaluate when the first subscriptions is registered.
+ dependentObservable.beforeSubscriptionAdd = function (event) {
+ if (event == 'change' || event == 'beforeChange') {
+ peek();
+ }
+ }
+ }
+
+ ko.exportProperty(dependentObservable, 'peek', dependentObservable.peek);
+ ko.exportProperty(dependentObservable, 'dispose', dependentObservable.dispose);
+ ko.exportProperty(dependentObservable, 'isActive', dependentObservable.isActive);
+ ko.exportProperty(dependentObservable, 'getDependenciesCount', dependentObservable.getDependenciesCount);
+
+ // Add a "disposeWhen" callback that, on each evaluation, disposes if the node was removed without using ko.removeNode.
+ if (disposeWhenNodeIsRemoved) {
+ // Since this computed is associated with a DOM node, and we don't want to dispose the computed
+ // until the DOM node is *removed* from the document (as opposed to never having been in the document),
+ // we'll prevent disposal until "disposeWhen" first returns false.
+ _suppressDisposalUntilDisposeWhenReturnsFalse = true;
+
+ // Only watch for the node's disposal if the value really is a node. It might not be,
+ // e.g., { disposeWhenNodeIsRemoved: true } can be used to opt into the "only dispose
+ // after first false result" behaviour even if there's no specific node to watch. This
+ // technique is intended for KO's internal use only and shouldn't be documented or used
+ // by application code, as it's likely to change in a future version of KO.
+ if (disposeWhenNodeIsRemoved.nodeType) {
+ disposeWhen = function () {
+ return !ko.utils.domNodeIsAttachedToDocument(disposeWhenNodeIsRemoved) || (disposeWhenOption && disposeWhenOption());
+ };
+ }
+ }
+
+ // Evaluate, unless sleeping or deferEvaluation is true
+ if (!isSleeping && !options['deferEvaluation'])
+ evaluateImmediate();
+
+ // Attach a DOM node disposal callback so that the computed will be proactively disposed as soon as the node is
+ // removed using ko.removeNode. But skip if isActive is false (there will never be any dependencies to dispose).
+ if (disposeWhenNodeIsRemoved && isActive() && disposeWhenNodeIsRemoved.nodeType) {
+ dispose = function() {
+ ko.utils.domNodeDisposal.removeDisposeCallback(disposeWhenNodeIsRemoved, dispose);
+ disposeComputed();
+ };
+ ko.utils.domNodeDisposal.addDisposeCallback(disposeWhenNodeIsRemoved, dispose);
+ }
+
+ return dependentObservable;
+};
+
+ko.isComputed = function(instance) {
+ return ko.hasPrototype(instance, ko.dependentObservable);
+};
+
+var protoProp = ko.observable.protoProperty; // == "__ko_proto__"
+ko.dependentObservable[protoProp] = ko.observable;
+
+ko.dependentObservable['fn'] = {
+ "equalityComparer": valuesArePrimitiveAndEqual
+};
+ko.dependentObservable['fn'][protoProp] = ko.dependentObservable;
+
+// Note that for browsers that don't support proto assignment, the
+// inheritance chain is created manually in the ko.dependentObservable constructor
+if (ko.utils.canSetPrototype) {
+ ko.utils.setPrototypeOf(ko.dependentObservable['fn'], ko.subscribable['fn']);
+}
+
+ko.exportSymbol('dependentObservable', ko.dependentObservable);
+ko.exportSymbol('computed', ko.dependentObservable); // Make "ko.computed" an alias for "ko.dependentObservable"
+ko.exportSymbol('isComputed', ko.isComputed);
+
+ko.pureComputed = function (evaluatorFunctionOrOptions, evaluatorFunctionTarget) {
+ if (typeof evaluatorFunctionOrOptions === 'function') {
+ return ko.computed(evaluatorFunctionOrOptions, evaluatorFunctionTarget, {'pure':true});
+ } else {
+ evaluatorFunctionOrOptions = ko.utils.extend({}, evaluatorFunctionOrOptions); // make a copy of the parameter object
+ evaluatorFunctionOrOptions['pure'] = true;
+ return ko.computed(evaluatorFunctionOrOptions, evaluatorFunctionTarget);
+ }
+}
+ko.exportSymbol('pureComputed', ko.pureComputed);
+
+(function() {
+ var maxNestedObservableDepth = 10; // Escape the (unlikely) pathalogical case where an observable's current value is itself (or similar reference cycle)
+
+ ko.toJS = function(rootObject) {
+ if (arguments.length == 0)
+ throw new Error("When calling ko.toJS, pass the object you want to convert.");
+
+ // We just unwrap everything at every level in the object graph
+ return mapJsObjectGraph(rootObject, function(valueToMap) {
+ // Loop because an observable's value might in turn be another observable wrapper
+ for (var i = 0; ko.isObservable(valueToMap) && (i < maxNestedObservableDepth); i++)
+ valueToMap = valueToMap();
+ return valueToMap;
+ });
+ };
+
+ ko.toJSON = function(rootObject, replacer, space) { // replacer and space are optional
+ var plainJavaScriptObject = ko.toJS(rootObject);
+ return ko.utils.stringifyJson(plainJavaScriptObject, replacer, space);
+ };
+
+ function mapJsObjectGraph(rootObject, mapInputCallback, visitedObjects) {
+ visitedObjects = visitedObjects || new objectLookup();
+
+ rootObject = mapInputCallback(rootObject);
+ var canHaveProperties = (typeof rootObject == "object") && (rootObject !== null) && (rootObject !== undefined) && (!(rootObject instanceof Date)) && (!(rootObject instanceof String)) && (!(rootObject instanceof Number)) && (!(rootObject instanceof Boolean));
+ if (!canHaveProperties)
+ return rootObject;
+
+ var outputProperties = rootObject instanceof Array ? [] : {};
+ visitedObjects.save(rootObject, outputProperties);
+
+ visitPropertiesOrArrayEntries(rootObject, function(indexer) {
+ var propertyValue = mapInputCallback(rootObject[indexer]);
+
+ switch (typeof propertyValue) {
+ case "boolean":
+ case "number":
+ case "string":
+ case "function":
+ outputProperties[indexer] = propertyValue;
+ break;
+ case "object":
+ case "undefined":
+ var previouslyMappedValue = visitedObjects.get(propertyValue);
+ outputProperties[indexer] = (previouslyMappedValue !== undefined)
+ ? previouslyMappedValue
+ : mapJsObjectGraph(propertyValue, mapInputCallback, visitedObjects);
+ break;
+ }
+ });
+
+ return outputProperties;
+ }
+
+ function visitPropertiesOrArrayEntries(rootObject, visitorCallback) {
+ if (rootObject instanceof Array) {
+ for (var i = 0; i < rootObject.length; i++)
+ visitorCallback(i);
+
+ // For arrays, also respect toJSON property for custom mappings (fixes #278)
+ if (typeof rootObject['toJSON'] == 'function')
+ visitorCallback('toJSON');
+ } else {
+ for (var propertyName in rootObject) {
+ visitorCallback(propertyName);
+ }
+ }
+ };
+
+ function objectLookup() {
+ this.keys = [];
+ this.values = [];
+ };
+
+ objectLookup.prototype = {
+ constructor: objectLookup,
+ save: function(key, value) {
+ var existingIndex = ko.utils.arrayIndexOf(this.keys, key);
+ if (existingIndex >= 0)
+ this.values[existingIndex] = value;
+ else {
+ this.keys.push(key);
+ this.values.push(value);
+ }
+ },
+ get: function(key) {
+ var existingIndex = ko.utils.arrayIndexOf(this.keys, key);
+ return (existingIndex >= 0) ? this.values[existingIndex] : undefined;
+ }
+ };
+})();
+
+ko.exportSymbol('toJS', ko.toJS);
+ko.exportSymbol('toJSON', ko.toJSON);
+(function () {
+ var hasDomDataExpandoProperty = '__ko__hasDomDataOptionValue__';
+
+ // Normally, SELECT elements and their OPTIONs can only take value of type 'string' (because the values
+ // are stored on DOM attributes). ko.selectExtensions provides a way for SELECTs/OPTIONs to have values
+ // that are arbitrary objects. This is very convenient when implementing things like cascading dropdowns.
+ ko.selectExtensions = {
+ readValue : function(element) {
+ switch (ko.utils.tagNameLower(element)) {
+ case 'option':
+ if (element[hasDomDataExpandoProperty] === true)
+ return ko.utils.domData.get(element, ko.bindingHandlers.options.optionValueDomDataKey);
+ return ko.utils.ieVersion <= 7
+ ? (element.getAttributeNode('value') && element.getAttributeNode('value').specified ? element.value : element.text)
+ : element.value;
+ case 'select':
+ return element.selectedIndex >= 0 ? ko.selectExtensions.readValue(element.options[element.selectedIndex]) : undefined;
+ default:
+ return element.value;
+ }
+ },
+
+ writeValue: function(element, value, allowUnset) {
+ switch (ko.utils.tagNameLower(element)) {
+ case 'option':
+ switch(typeof value) {
+ case "string":
+ ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, undefined);
+ if (hasDomDataExpandoProperty in element) { // IE <= 8 throws errors if you delete non-existent properties from a DOM node
+ delete element[hasDomDataExpandoProperty];
+ }
+ element.value = value;
+ break;
+ default:
+ // Store arbitrary object using DomData
+ ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, value);
+ element[hasDomDataExpandoProperty] = true;
+
+ // Special treatment of numbers is just for backward compatibility. KO 1.2.1 wrote numerical values to element.value.
+ element.value = typeof value === "number" ? value : "";
+ break;
+ }
+ break;
+ case 'select':
+ if (value === "" || value === null) // A blank string or null value will select the caption
+ value = undefined;
+ var selection = -1;
+ for (var i = 0, n = element.options.length, optionValue; i < n; ++i) {
+ optionValue = ko.selectExtensions.readValue(element.options[i]);
+ // Include special check to handle selecting a caption with a blank string value
+ if (optionValue == value || (optionValue == "" && value === undefined)) {
+ selection = i;
+ break;
+ }
+ }
+ if (allowUnset || selection >= 0 || (value === undefined && element.size > 1)) {
+ element.selectedIndex = selection;
+ }
+ break;
+ default:
+ if ((value === null) || (value === undefined))
+ value = "";
+ element.value = value;
+ break;
+ }
+ }
+ };
+})();
+
+ko.exportSymbol('selectExtensions', ko.selectExtensions);
+ko.exportSymbol('selectExtensions.readValue', ko.selectExtensions.readValue);
+ko.exportSymbol('selectExtensions.writeValue', ko.selectExtensions.writeValue);
+ko.expressionRewriting = (function () {
+ var javaScriptReservedWords = ["true", "false", "null", "undefined"];
+
+ // Matches something that can be assigned to--either an isolated identifier or something ending with a property accessor
+ // This is designed to be simple and avoid false negatives, but could produce false positives (e.g., a+b.c).
+ // This also will not properly handle nested brackets (e.g., obj1[obj2['prop']]; see #911).
+ var javaScriptAssignmentTarget = /^(?:[$_a-z][$\w]*|(.+)(\.\s*[$_a-z][$\w]*|\[.+\]))$/i;
+
+ function getWriteableValue(expression) {
+ if (ko.utils.arrayIndexOf(javaScriptReservedWords, expression) >= 0)
+ return false;
+ var match = expression.match(javaScriptAssignmentTarget);
+ return match === null ? false : match[1] ? ('Object(' + match[1] + ')' + match[2]) : expression;
+ }
+
+ // The following regular expressions will be used to split an object-literal string into tokens
+
+ // These two match strings, either with double quotes or single quotes
+ var stringDouble = '"(?:[^"\\\\]|\\\\.)*"',
+ stringSingle = "'(?:[^'\\\\]|\\\\.)*'",
+ // Matches a regular expression (text enclosed by slashes), but will also match sets of divisions
+ // as a regular expression (this is handled by the parsing loop below).
+ stringRegexp = '/(?:[^/\\\\]|\\\\.)*/\w*',
+ // These characters have special meaning to the parser and must not appear in the middle of a
+ // token, except as part of a string.
+ specials = ',"\'{}()/:[\\]',
+ // Match text (at least two characters) that does not contain any of the above special characters,
+ // although some of the special characters are allowed to start it (all but the colon and comma).
+ // The text can contain spaces, but leading or trailing spaces are skipped.
+ everyThingElse = '[^\\s:,/][^' + specials + ']*[^\\s' + specials + ']',
+ // Match any non-space character not matched already. This will match colons and commas, since they're
+ // not matched by "everyThingElse", but will also match any other single character that wasn't already
+ // matched (for example: in "a: 1, b: 2", each of the non-space characters will be matched by oneNotSpace).
+ oneNotSpace = '[^\\s]',
+
+ // Create the actual regular expression by or-ing the above strings. The order is important.
+ bindingToken = RegExp(stringDouble + '|' + stringSingle + '|' + stringRegexp + '|' + everyThingElse + '|' + oneNotSpace, 'g'),
+
+ // Match end of previous token to determine whether a slash is a division or regex.
+ divisionLookBehind = /[\])"'A-Za-z0-9_$]+$/,
+ keywordRegexLookBehind = {'in':1,'return':1,'typeof':1};
+
+ function parseObjectLiteral(objectLiteralString) {
+ // Trim leading and trailing spaces from the string
+ var str = ko.utils.stringTrim(objectLiteralString);
+
+ // Trim braces '{' surrounding the whole object literal
+ if (str.charCodeAt(0) === 123) str = str.slice(1, -1);
+
+ // Split into tokens
+ var result = [], toks = str.match(bindingToken), key, values = [], depth = 0;
+
+ if (toks) {
+ // Append a comma so that we don't need a separate code block to deal with the last item
+ toks.push(',');
+
+ for (var i = 0, tok; tok = toks[i]; ++i) {
+ var c = tok.charCodeAt(0);
+ // A comma signals the end of a key/value pair if depth is zero
+ if (c === 44) { // ","
+ if (depth <= 0) {
+ result.push((key && values.length) ? {key: key, value: values.join('')} : {'unknown': key || values.join('')});
+ key = depth = 0;
+ values = [];
+ continue;
+ }
+ // Simply skip the colon that separates the name and value
+ } else if (c === 58) { // ":"
+ if (!depth && !key && values.length === 1) {
+ key = values.pop();
+ continue;
+ }
+ // A set of slashes is initially matched as a regular expression, but could be division
+ } else if (c === 47 && i && tok.length > 1) { // "/"
+ // Look at the end of the previous token to determine if the slash is actually division
+ var match = toks[i-1].match(divisionLookBehind);
+ if (match && !keywordRegexLookBehind[match[0]]) {
+ // The slash is actually a division punctuator; re-parse the remainder of the string (not including the slash)
+ str = str.substr(str.indexOf(tok) + 1);
+ toks = str.match(bindingToken);
+ toks.push(',');
+ i = -1;
+ // Continue with just the slash
+ tok = '/';
+ }
+ // Increment depth for parentheses, braces, and brackets so that interior commas are ignored
+ } else if (c === 40 || c === 123 || c === 91) { // '(', '{', '['
+ ++depth;
+ } else if (c === 41 || c === 125 || c === 93) { // ')', '}', ']'
+ --depth;
+ // The key will be the first token; if it's a string, trim the quotes
+ } else if (!key && !values.length && (c === 34 || c === 39)) { // '"', "'"
+ tok = tok.slice(1, -1);
+ }
+ values.push(tok);
+ }
+ }
+ return result;
+ }
+
+ // Two-way bindings include a write function that allow the handler to update the value even if it's not an observable.
+ var twoWayBindings = {};
+
+ function preProcessBindings(bindingsStringOrKeyValueArray, bindingOptions) {
+ bindingOptions = bindingOptions || {};
+
+ function processKeyValue(key, val) {
+ var writableVal;
+ function callPreprocessHook(obj) {
+ return (obj && obj['preprocess']) ? (val = obj['preprocess'](val, key, processKeyValue)) : true;
+ }
+ if (!bindingParams) {
+ if (!callPreprocessHook(ko['getBindingHandler'](key)))
+ return;
+
+ if (twoWayBindings[key] && (writableVal = getWriteableValue(val))) {
+ // For two-way bindings, provide a write method in case the value
+ // isn't a writable observable.
+ propertyAccessorResultStrings.push("'" + key + "':function(_z){" + writableVal + "=_z}");
+ }
+ }
+ // Values are wrapped in a function so that each value can be accessed independently
+ if (makeValueAccessors) {
+ val = 'function(){return ' + val + ' }';
+ }
+ resultStrings.push("'" + key + "':" + val);
+ }
+
+ var resultStrings = [],
+ propertyAccessorResultStrings = [],
+ makeValueAccessors = bindingOptions['valueAccessors'],
+ bindingParams = bindingOptions['bindingParams'],
+ keyValueArray = typeof bindingsStringOrKeyValueArray === "string" ?
+ parseObjectLiteral(bindingsStringOrKeyValueArray) : bindingsStringOrKeyValueArray;
+
+ ko.utils.arrayForEach(keyValueArray, function(keyValue) {
+ processKeyValue(keyValue.key || keyValue['unknown'], keyValue.value);
+ });
+
+ if (propertyAccessorResultStrings.length)
+ processKeyValue('_ko_property_writers', "{" + propertyAccessorResultStrings.join(",") + " }");
+
+ return resultStrings.join(",");
+ }
+
+ return {
+ bindingRewriteValidators: [],
+
+ twoWayBindings: twoWayBindings,
+
+ parseObjectLiteral: parseObjectLiteral,
+
+ preProcessBindings: preProcessBindings,
+
+ keyValueArrayContainsKey: function(keyValueArray, key) {
+ for (var i = 0; i < keyValueArray.length; i++)
+ if (keyValueArray[i]['key'] == key)
+ return true;
+ return false;
+ },
+
+ // Internal, private KO utility for updating model properties from within bindings
+ // property: If the property being updated is (or might be) an observable, pass it here
+ // If it turns out to be a writable observable, it will be written to directly
+ // allBindings: An object with a get method to retrieve bindings in the current execution context.
+ // This will be searched for a '_ko_property_writers' property in case you're writing to a non-observable
+ // key: The key identifying the property to be written. Example: for { hasFocus: myValue }, write to 'myValue' by specifying the key 'hasFocus'
+ // value: The value to be written
+ // checkIfDifferent: If true, and if the property being written is a writable observable, the value will only be written if
+ // it is !== existing value on that writable observable
+ writeValueToProperty: function(property, allBindings, key, value, checkIfDifferent) {
+ if (!property || !ko.isObservable(property)) {
+ var propWriters = allBindings.get('_ko_property_writers');
+ if (propWriters && propWriters[key])
+ propWriters[key](value);
+ } else if (ko.isWriteableObservable(property) && (!checkIfDifferent || property.peek() !== value)) {
+ property(value);
+ }
+ }
+ };
+})();
+
+ko.exportSymbol('expressionRewriting', ko.expressionRewriting);
+ko.exportSymbol('expressionRewriting.bindingRewriteValidators', ko.expressionRewriting.bindingRewriteValidators);
+ko.exportSymbol('expressionRewriting.parseObjectLiteral', ko.expressionRewriting.parseObjectLiteral);
+ko.exportSymbol('expressionRewriting.preProcessBindings', ko.expressionRewriting.preProcessBindings);
+
+// Making bindings explicitly declare themselves as "two way" isn't ideal in the long term (it would be better if
+// all bindings could use an official 'property writer' API without needing to declare that they might). However,
+// since this is not, and has never been, a public API (_ko_property_writers was never documented), it's acceptable
+// as an internal implementation detail in the short term.
+// For those developers who rely on _ko_property_writers in their custom bindings, we expose _twoWayBindings as an
+// undocumented feature that makes it relatively easy to upgrade to KO 3.0. However, this is still not an official
+// public API, and we reserve the right to remove it at any time if we create a real public property writers API.
+ko.exportSymbol('expressionRewriting._twoWayBindings', ko.expressionRewriting.twoWayBindings);
+
+// For backward compatibility, define the following aliases. (Previously, these function names were misleading because
+// they referred to JSON specifically, even though they actually work with arbitrary JavaScript object literal expressions.)
+ko.exportSymbol('jsonExpressionRewriting', ko.expressionRewriting);
+ko.exportSymbol('jsonExpressionRewriting.insertPropertyAccessorsIntoJson', ko.expressionRewriting.preProcessBindings);
+(function() {
+ // "Virtual elements" is an abstraction on top of the usual DOM API which understands the notion that comment nodes
+ // may be used to represent hierarchy (in addition to the DOM's natural hierarchy).
+ // If you call the DOM-manipulating functions on ko.virtualElements, you will be able to read and write the state
+ // of that virtual hierarchy
+ //
+ // The point of all this is to support containerless templates (e.g., <!-- ko foreach:someCollection -->blah<!-- /ko -->)
+ // without having to scatter special cases all over the binding and templating code.
+
+ // IE 9 cannot reliably read the "nodeValue" property of a comment node (see https://github.com/SteveSanderson/knockout/issues/186)
+ // but it does give them a nonstandard alternative property called "text" that it can read reliably. Other browsers don't have that property.
+ // So, use node.text where available, and node.nodeValue elsewhere
+ var commentNodesHaveTextProperty = document && document.createComment("test").text === "<!--test-->";
+
+ var startCommentRegex = commentNodesHaveTextProperty ? /^<!--\s*ko(?:\s+([\s\S]+))?\s*-->$/ : /^\s*ko(?:\s+([\s\S]+))?\s*$/;
+ var endCommentRegex = commentNodesHaveTextProperty ? /^<!--\s*\/ko\s*-->$/ : /^\s*\/ko\s*$/;
+ var htmlTagsWithOptionallyClosingChildren = { 'ul': true, 'ol': true };
+
+ function isStartComment(node) {
+ return (node.nodeType == 8) && startCommentRegex.test(commentNodesHaveTextProperty ? node.text : node.nodeValue);
+ }
+
+ function isEndComment(node) {
+ return (node.nodeType == 8) && endCommentRegex.test(commentNodesHaveTextProperty ? node.text : node.nodeValue);
+ }
+
+ function getVirtualChildren(startComment, allowUnbalanced) {
+ var currentNode = startComment;
+ var depth = 1;
+ var children = [];
+ while (currentNode = currentNode.nextSibling) {
+ if (isEndComment(currentNode)) {
+ depth--;
+ if (depth === 0)
+ return children;
+ }
+
+ children.push(currentNode);
+
+ if (isStartComment(currentNode))
+ depth++;
+ }
+ if (!allowUnbalanced)
+ throw new Error("Cannot find closing comment tag to match: " + startComment.nodeValue);
+ return null;
+ }
+
+ function getMatchingEndComment(startComment, allowUnbalanced) {
+ var allVirtualChildren = getVirtualChildren(startComment, allowUnbalanced);
+ if (allVirtualChildren) {
+ if (allVirtualChildren.length > 0)
+ return allVirtualChildren[allVirtualChildren.length - 1].nextSibling;
+ return startComment.nextSibling;
+ } else
+ return null; // Must have no matching end comment, and allowUnbalanced is true
+ }
+
+ function getUnbalancedChildTags(node) {
+ // e.g., from <div>OK</div><!-- ko blah --><span>Another</span>, returns: <!-- ko blah --><span>Another</span>
+ // from <div>OK</div><!-- /ko --><!-- /ko -->, returns: <!-- /ko --><!-- /ko -->
+ var childNode = node.firstChild, captureRemaining = null;
+ if (childNode) {
+ do {
+ if (captureRemaining) // We already hit an unbalanced node and are now just scooping up all subsequent nodes
+ captureRemaining.push(childNode);
+ else if (isStartComment(childNode)) {
+ var matchingEndComment = getMatchingEndComment(childNode, /* allowUnbalanced: */ true);
+ if (matchingEndComment) // It's a balanced tag, so skip immediately to the end of this virtual set
+ childNode = matchingEndComment;
+ else
+ captureRemaining = [childNode]; // It's unbalanced, so start capturing from this point
+ } else if (isEndComment(childNode)) {
+ captureRemaining = [childNode]; // It's unbalanced (if it wasn't, we'd have skipped over it already), so start capturing
+ }
+ } while (childNode = childNode.nextSibling);
+ }
+ return captureRemaining;
+ }
+
+ ko.virtualElements = {
+ allowedBindings: {},
+
+ childNodes: function(node) {
+ return isStartComment(node) ? getVirtualChildren(node) : node.childNodes;
+ },
+
+ emptyNode: function(node) {
+ if (!isStartComment(node))
+ ko.utils.emptyDomNode(node);
+ else {
+ var virtualChildren = ko.virtualElements.childNodes(node);
+ for (var i = 0, j = virtualChildren.length; i < j; i++)
+ ko.removeNode(virtualChildren[i]);
+ }
+ },
+
+ setDomNodeChildren: function(node, childNodes) {
+ if (!isStartComment(node))
+ ko.utils.setDomNodeChildren(node, childNodes);
+ else {
+ ko.virtualElements.emptyNode(node);
+ var endCommentNode = node.nextSibling; // Must be the next sibling, as we just emptied the children
+ for (var i = 0, j = childNodes.length; i < j; i++)
+ endCommentNode.parentNode.insertBefore(childNodes[i], endCommentNode);
+ }
+ },
+
+ prepend: function(containerNode, nodeToPrepend) {
+ if (!isStartComment(containerNode)) {
+ if (containerNode.firstChild)
+ containerNode.insertBefore(nodeToPrepend, containerNode.firstChild);
+ else
+ containerNode.appendChild(nodeToPrepend);
+ } else {
+ // Start comments must always have a parent and at least one following sibling (the end comment)
+ containerNode.parentNode.insertBefore(nodeToPrepend, containerNode.nextSibling);
+ }
+ },
+
+ insertAfter: function(containerNode, nodeToInsert, insertAfterNode) {
+ if (!insertAfterNode) {
+ ko.virtualElements.prepend(containerNode, nodeToInsert);
+ } else if (!isStartComment(containerNode)) {
+ // Insert after insertion point
+ if (insertAfterNode.nextSibling)
+ containerNode.insertBefore(nodeToInsert, insertAfterNode.nextSibling);
+ else
+ containerNode.appendChild(nodeToInsert);
+ } else {
+ // Children of start comments must always have a parent and at least one following sibling (the end comment)
+ containerNode.parentNode.insertBefore(nodeToInsert, insertAfterNode.nextSibling);
+ }
+ },
+
+ firstChild: function(node) {
+ if (!isStartComment(node))
+ return node.firstChild;
+ if (!node.nextSibling || isEndComment(node.nextSibling))
+ return null;
+ return node.nextSibling;
+ },
+
+ nextSibling: function(node) {
+ if (isStartComment(node))
+ node = getMatchingEndComment(node);
+ if (node.nextSibling && isEndComment(node.nextSibling))
+ return null;
+ return node.nextSibling;
+ },
+
+ hasBindingValue: isStartComment,
+
+ virtualNodeBindingValue: function(node) {
+ var regexMatch = (commentNodesHaveTextProperty ? node.text : node.nodeValue).match(startCommentRegex);
+ return regexMatch ? regexMatch[1] : null;
+ },
+
+ normaliseVirtualElementDomStructure: function(elementVerified) {
+ // Workaround for https://github.com/SteveSanderson/knockout/issues/155
+ // (IE <= 8 or IE 9 quirks mode parses your HTML weirdly, treating closing </li> tags as if they don't exist, thereby moving comment nodes
+ // that are direct descendants of <ul> into the preceding <li>)
+ if (!htmlTagsWithOptionallyClosingChildren[ko.utils.tagNameLower(elementVerified)])
+ return;
+
+ // Scan immediate children to see if they contain unbalanced comment tags. If they do, those comment tags
+ // must be intended to appear *after* that child, so move them there.
+ var childNode = elementVerified.firstChild;
+ if (childNode) {
+ do {
+ if (childNode.nodeType === 1) {
+ var unbalancedTags = getUnbalancedChildTags(childNode);
+ if (unbalancedTags) {
+ // Fix up the DOM by moving the unbalanced tags to where they most likely were intended to be placed - *after* the child
+ var nodeToInsertBefore = childNode.nextSibling;
+ for (var i = 0; i < unbalancedTags.length; i++) {
+ if (nodeToInsertBefore)
+ elementVerified.insertBefore(unbalancedTags[i], nodeToInsertBefore);
+ else
+ elementVerified.appendChild(unbalancedTags[i]);
+ }
+ }
+ }
+ } while (childNode = childNode.nextSibling);
+ }
+ }
+ };
+})();
+ko.exportSymbol('virtualElements', ko.virtualElements);
+ko.exportSymbol('virtualElements.allowedBindings', ko.virtualElements.allowedBindings);
+ko.exportSymbol('virtualElements.emptyNode', ko.virtualElements.emptyNode);
+//ko.exportSymbol('virtualElements.firstChild', ko.virtualElements.firstChild); // firstChild is not minified
+ko.exportSymbol('virtualElements.insertAfter', ko.virtualElements.insertAfter);
+//ko.exportSymbol('virtualElements.nextSibling', ko.virtualElements.nextSibling); // nextSibling is not minified
+ko.exportSymbol('virtualElements.prepend', ko.virtualElements.prepend);
+ko.exportSymbol('virtualElements.setDomNodeChildren', ko.virtualElements.setDomNodeChildren);
+(function() {
+ var defaultBindingAttributeName = "data-bind";
+
+ ko.bindingProvider = function() {
+ this.bindingCache = {};
+ };
+
+ ko.utils.extend(ko.bindingProvider.prototype, {
+ 'nodeHasBindings': function(node) {
+ switch (node.nodeType) {
+ case 1: // Element
+ return node.getAttribute(defaultBindingAttributeName) != null
+ || ko.components['getComponentNameForNode'](node);
+ case 8: // Comment node
+ return ko.virtualElements.hasBindingValue(node);
+ default: return false;
+ }
+ },
+
+ 'getBindings': function(node, bindingContext) {
+ var bindingsString = this['getBindingsString'](node, bindingContext),
+ parsedBindings = bindingsString ? this['parseBindingsString'](bindingsString, bindingContext, node) : null;
+ return ko.components.addBindingsForCustomElement(parsedBindings, node, bindingContext, /* valueAccessors */ false);
+ },
+
+ 'getBindingAccessors': function(node, bindingContext) {
+ var bindingsString = this['getBindingsString'](node, bindingContext),
+ parsedBindings = bindingsString ? this['parseBindingsString'](bindingsString, bindingContext, node, { 'valueAccessors': true }) : null;
+ return ko.components.addBindingsForCustomElement(parsedBindings, node, bindingContext, /* valueAccessors */ true);
+ },
+
+ // The following function is only used internally by this default provider.
+ // It's not part of the interface definition for a general binding provider.
+ 'getBindingsString': function(node, bindingContext) {
+ switch (node.nodeType) {
+ case 1: return node.getAttribute(defaultBindingAttributeName); // Element
+ case 8: return ko.virtualElements.virtualNodeBindingValue(node); // Comment node
+ default: return null;
+ }
+ },
+
+ // The following function is only used internally by this default provider.
+ // It's not part of the interface definition for a general binding provider.
+ 'parseBindingsString': function(bindingsString, bindingContext, node, options) {
+ try {
+ var bindingFunction = createBindingsStringEvaluatorViaCache(bindingsString, this.bindingCache, options);
+ return bindingFunction(bindingContext, node);
+ } catch (ex) {
+ ex.message = "Unable to parse bindings.\nBindings value: " + bindingsString + "\nMessage: " + ex.message;
+ throw ex;
+ }
+ }
+ });
+
+ ko.bindingProvider['instance'] = new ko.bindingProvider();
+
+ function createBindingsStringEvaluatorViaCache(bindingsString, cache, options) {
+ var cacheKey = bindingsString + (options && options['valueAccessors'] || '');
+ return cache[cacheKey]
+ || (cache[cacheKey] = createBindingsStringEvaluator(bindingsString, options));
+ }
+
+ function createBindingsStringEvaluator(bindingsString, options) {
+ // Build the source for a function that evaluates "expression"
+ // For each scope variable, add an extra level of "with" nesting
+ // Example result: with(sc1) { with(sc0) { return (expression) } }
+ var rewrittenBindings = ko.expressionRewriting.preProcessBindings(bindingsString, options),
+ functionBody = "with($context){with($data||{}){return{" + rewrittenBindings + "}}}";
+ return new Function("$context", "$element", functionBody);
+ }
+})();
+
+ko.exportSymbol('bindingProvider', ko.bindingProvider);
+(function () {
+ ko.bindingHandlers = {};
+
+ // The following element types will not be recursed into during binding. In the future, we
+ // may consider adding <template> to this list, because such elements' contents are always
+ // intended to be bound in a different context from where they appear in the document.
+ var bindingDoesNotRecurseIntoElementTypes = {
+ // Don't want bindings that operate on text nodes to mutate <script> and <textarea> contents,
+ // because it's unexpected and a potential XSS issue
+ 'script': true,
+ 'textarea': true
+ };
+
+ // Use an overridable method for retrieving binding handlers so that a plugins may support dynamically created handlers
+ ko['getBindingHandler'] = function(bindingKey) {
+ return ko.bindingHandlers[bindingKey];
+ };
+
+ // The ko.bindingContext constructor is only called directly to create the root context. For child
+ // contexts, use bindingContext.createChildContext or bindingContext.extend.
+ ko.bindingContext = function(dataItemOrAccessor, parentContext, dataItemAlias, extendCallback) {
+
+ // The binding context object includes static properties for the current, parent, and root view models.
+ // If a view model is actually stored in an observable, the corresponding binding context object, and
+ // any child contexts, must be updated when the view model is changed.
+ function updateContext() {
+ // Most of the time, the context will directly get a view model object, but if a function is given,
+ // we call the function to retrieve the view model. If the function accesses any obsevables or returns
+ // an observable, the dependency is tracked, and those observables can later cause the binding
+ // context to be updated.
+ var dataItemOrObservable = isFunc ? dataItemOrAccessor() : dataItemOrAccessor,
+ dataItem = ko.utils.unwrapObservable(dataItemOrObservable);
+
+ if (parentContext) {
+ // When a "parent" context is given, register a dependency on the parent context. Thus whenever the
+ // parent context is updated, this context will also be updated.
+ if (parentContext._subscribable)
+ parentContext._subscribable();
+
+ // Copy $root and any custom properties from the parent context
+ ko.utils.extend(self, parentContext);
+
+ // Because the above copy overwrites our own properties, we need to reset them.
+ // During the first execution, "subscribable" isn't set, so don't bother doing the update then.
+ if (subscribable) {
+ self._subscribable = subscribable;
+ }
+ } else {
+ self['$parents'] = [];
+ self['$root'] = dataItem;
+
+ // Export 'ko' in the binding context so it will be available in bindings and templates
+ // even if 'ko' isn't exported as a global, such as when using an AMD loader.
+ // See https://github.com/SteveSanderson/knockout/issues/490
+ self['ko'] = ko;
+ }
+ self['$rawData'] = dataItemOrObservable;
+ self['$data'] = dataItem;
+ if (dataItemAlias)
+ self[dataItemAlias] = dataItem;
+
+ // The extendCallback function is provided when creating a child context or extending a context.
+ // It handles the specific actions needed to finish setting up the binding context. Actions in this
+ // function could also add dependencies to this binding context.
+ if (extendCallback)
+ extendCallback(self, parentContext, dataItem);
+
+ return self['$data'];
+ }
+ function disposeWhen() {
+ return nodes && !ko.utils.anyDomNodeIsAttachedToDocument(nodes);
+ }
+
+ var self = this,
+ isFunc = typeof(dataItemOrAccessor) == "function" && !ko.isObservable(dataItemOrAccessor),
+ nodes,
+ subscribable = ko.dependentObservable(updateContext, null, { disposeWhen: disposeWhen, disposeWhenNodeIsRemoved: true });
+
+ // At this point, the binding context has been initialized, and the "subscribable" computed observable is
+ // subscribed to any observables that were accessed in the process. If there is nothing to track, the
+ // computed will be inactive, and we can safely throw it away. If it's active, the computed is stored in
+ // the context object.
+ if (subscribable.isActive()) {
+ self._subscribable = subscribable;
+
+ // Always notify because even if the model ($data) hasn't changed, other context properties might have changed
+ subscribable['equalityComparer'] = null;
+
+ // We need to be able to dispose of this computed observable when it's no longer needed. This would be
+ // easy if we had a single node to watch, but binding contexts can be used by many different nodes, and
+ // we cannot assume that those nodes have any relation to each other. So instead we track any node that
+ // the context is attached to, and dispose the computed when all of those nodes have been cleaned.
+
+ // Add properties to *subscribable* instead of *self* because any properties added to *self* may be overwritten on updates
+ nodes = [];
+ subscribable._addNode = function(node) {
+ nodes.push(node);
+ ko.utils.domNodeDisposal.addDisposeCallback(node, function(node) {
+ ko.utils.arrayRemoveItem(nodes, node);
+ if (!nodes.length) {
+ subscribable.dispose();
+ self._subscribable = subscribable = undefined;
+ }
+ });
+ };
+ }
+ }
+
+ // Extend the binding context hierarchy with a new view model object. If the parent context is watching
+ // any obsevables, the new child context will automatically get a dependency on the parent context.
+ // But this does not mean that the $data value of the child context will also get updated. If the child
+ // view model also depends on the parent view model, you must provide a function that returns the correct
+ // view model on each update.
+ ko.bindingContext.prototype['createChildContext'] = function (dataItemOrAccessor, dataItemAlias, extendCallback) {
+ return new ko.bindingContext(dataItemOrAccessor, this, dataItemAlias, function(self, parentContext) {
+ // Extend the context hierarchy by setting the appropriate pointers
+ self['$parentContext'] = parentContext;
+ self['$parent'] = parentContext['$data'];
+ self['$parents'] = (parentContext['$parents'] || []).slice(0);
+ self['$parents'].unshift(self['$parent']);
+ if (extendCallback)
+ extendCallback(self);
+ });
+ };
+
+ // Extend the binding context with new custom properties. This doesn't change the context hierarchy.
+ // Similarly to "child" contexts, provide a function here to make sure that the correct values are set
+ // when an observable view model is updated.
+ ko.bindingContext.prototype['extend'] = function(properties) {
+ // If the parent context references an observable view model, "_subscribable" will always be the
+ // latest view model object. If not, "_subscribable" isn't set, and we can use the static "$data" value.
+ return new ko.bindingContext(this._subscribable || this['$data'], this, null, function(self, parentContext) {
+ // This "child" context doesn't directly track a parent observable view model,
+ // so we need to manually set the $rawData value to match the parent.
+ self['$rawData'] = parentContext['$rawData'];
+ ko.utils.extend(self, typeof(properties) == "function" ? properties() : properties);
+ });
+ };
+
+ // Returns the valueAccesor function for a binding value
+ function makeValueAccessor(value) {
+ return function() {
+ return value;
+ };
+ }
+
+ // Returns the value of a valueAccessor function
+ function evaluateValueAccessor(valueAccessor) {
+ return valueAccessor();
+ }
+
+ // Given a function that returns bindings, create and return a new object that contains
+ // binding value-accessors functions. Each accessor function calls the original function
+ // so that it always gets the latest value and all dependencies are captured. This is used
+ // by ko.applyBindingsToNode and getBindingsAndMakeAccessors.
+ function makeAccessorsFromFunction(callback) {
+ return ko.utils.objectMap(ko.dependencyDetection.ignore(callback), function(value, key) {
+ return function() {
+ return callback()[key];
+ };
+ });
+ }
+
+ // Given a bindings function or object, create and return a new object that contains
+ // binding value-accessors functions. This is used by ko.applyBindingsToNode.
+ function makeBindingAccessors(bindings, context, node) {
+ if (typeof bindings === 'function') {
+ return makeAccessorsFromFunction(bindings.bind(null, context, node));
+ } else {
+ return ko.utils.objectMap(bindings, makeValueAccessor);
+ }
+ }
+
+ // This function is used if the binding provider doesn't include a getBindingAccessors function.
+ // It must be called with 'this' set to the provider instance.
+ function getBindingsAndMakeAccessors(node, context) {
+ return makeAccessorsFromFunction(this['getBindings'].bind(this, node, context));
+ }
+
+ function validateThatBindingIsAllowedForVirtualElements(bindingName) {
+ var validator = ko.virtualElements.allowedBindings[bindingName];
+ if (!validator)
+ throw new Error("The binding '" + bindingName + "' cannot be used with virtual elements")
+ }
+
+ function applyBindingsToDescendantsInternal (bindingContext, elementOrVirtualElement, bindingContextsMayDifferFromDomParentElement) {
+ var currentChild,
+ nextInQueue = ko.virtualElements.firstChild(elementOrVirtualElement),
+ provider = ko.bindingProvider['instance'],
+ preprocessNode = provider['preprocessNode'];
+
+ // Preprocessing allows a binding provider to mutate a node before bindings are applied to it. For example it's
+ // possible to insert new siblings after it, and/or replace the node with a different one. This can be used to
+ // implement custom binding syntaxes, such as {{ value }} for string interpolation, or custom element types that
+ // trigger insertion of <template> contents at that point in the document.
+ if (preprocessNode) {
+ while (currentChild = nextInQueue) {
+ nextInQueue = ko.virtualElements.nextSibling(currentChild);
+ preprocessNode.call(provider, currentChild);
+ }
+ // Reset nextInQueue for the next loop
+ nextInQueue = ko.virtualElements.firstChild(elementOrVirtualElement);
+ }
+
+ while (currentChild = nextInQueue) {
+ // Keep a record of the next child *before* applying bindings, in case the binding removes the current child from its position
+ nextInQueue = ko.virtualElements.nextSibling(currentChild);
+ applyBindingsToNodeAndDescendantsInternal(bindingContext, currentChild, bindingContextsMayDifferFromDomParentElement);
+ }
+ }
+
+ function applyBindingsToNodeAndDescendantsInternal (bindingContext, nodeVerified, bindingContextMayDifferFromDomParentElement) {
+ var shouldBindDescendants = true;
+
+ // Perf optimisation: Apply bindings only if...
+ // (1) We need to store the binding context on this node (because it may differ from the DOM parent node's binding context)
+ // Note that we can't store binding contexts on non-elements (e.g., text nodes), as IE doesn't allow expando properties for those
+ // (2) It might have bindings (e.g., it has a data-bind attribute, or it's a marker for a containerless template)
+ var isElement = (nodeVerified.nodeType === 1);
+ if (isElement) // Workaround IE <= 8 HTML parsing weirdness
+ ko.virtualElements.normaliseVirtualElementDomStructure(nodeVerified);
+
+ var shouldApplyBindings = (isElement && bindingContextMayDifferFromDomParentElement) // Case (1)
+ || ko.bindingProvider['instance']['nodeHasBindings'](nodeVerified); // Case (2)
+ if (shouldApplyBindings)
+ shouldBindDescendants = applyBindingsToNodeInternal(nodeVerified, null, bindingContext, bindingContextMayDifferFromDomParentElement)['shouldBindDescendants'];
+
+ if (shouldBindDescendants && !bindingDoesNotRecurseIntoElementTypes[ko.utils.tagNameLower(nodeVerified)]) {
+ // We're recursing automatically into (real or virtual) child nodes without changing binding contexts. So,
+ // * For children of a *real* element, the binding context is certainly the same as on their DOM .parentNode,
+ // hence bindingContextsMayDifferFromDomParentElement is false
+ // * For children of a *virtual* element, we can't be sure. Evaluating .parentNode on those children may
+ // skip over any number of intermediate virtual elements, any of which might define a custom binding context,
+ // hence bindingContextsMayDifferFromDomParentElement is true
+ applyBindingsToDescendantsInternal(bindingContext, nodeVerified, /* bindingContextsMayDifferFromDomParentElement: */ !isElement);
+ }
+ }
+
+ var boundElementDomDataKey = ko.utils.domData.nextKey();
+
+
+ function topologicalSortBindings(bindings) {
+ // Depth-first sort
+ var result = [], // The list of key/handler pairs that we will return
+ bindingsConsidered = {}, // A temporary record of which bindings are already in 'result'
+ cyclicDependencyStack = []; // Keeps track of a depth-search so that, if there's a cycle, we know which bindings caused it
+ ko.utils.objectForEach(bindings, function pushBinding(bindingKey) {
+ if (!bindingsConsidered[bindingKey]) {
+ var binding = ko['getBindingHandler'](bindingKey);
+ if (binding) {
+ // First add dependencies (if any) of the current binding
+ if (binding['after']) {
+ cyclicDependencyStack.push(bindingKey);
+ ko.utils.arrayForEach(binding['after'], function(bindingDependencyKey) {
+ if (bindings[bindingDependencyKey]) {
+ if (ko.utils.arrayIndexOf(cyclicDependencyStack, bindingDependencyKey) !== -1) {
+ throw Error("Cannot combine the following bindings, because they have a cyclic dependency: " + cyclicDependencyStack.join(", "));
+ } else {
+ pushBinding(bindingDependencyKey);
+ }
+ }
+ });
+ cyclicDependencyStack.length--;
+ }
+ // Next add the current binding
+ result.push({ key: bindingKey, handler: binding });
+ }
+ bindingsConsidered[bindingKey] = true;
+ }
+ });
+
+ return result;
+ }
+
+ function applyBindingsToNodeInternal(node, sourceBindings, bindingContext, bindingContextMayDifferFromDomParentElement) {
+ // Prevent multiple applyBindings calls for the same node, except when a binding value is specified
+ var alreadyBound = ko.utils.domData.get(node, boundElementDomDataKey);
+ if (!sourceBindings) {
+ if (alreadyBound) {
+ throw Error("You cannot apply bindings multiple times to the same element.");
+ }
+ ko.utils.domData.set(node, boundElementDomDataKey, true);
+ }
+
+ // Optimization: Don't store the binding context on this node if it's definitely the same as on node.parentNode, because
+ // we can easily recover it just by scanning up the node's ancestors in the DOM
+ // (note: here, parent node means "real DOM parent" not "virtual parent", as there's no O(1) way to find the virtual parent)
+ if (!alreadyBound && bindingContextMayDifferFromDomParentElement)
+ ko.storedBindingContextForNode(node, bindingContext);
+
+ // Use bindings if given, otherwise fall back on asking the bindings provider to give us some bindings
+ var bindings;
+ if (sourceBindings && typeof sourceBindings !== 'function') {
+ bindings = sourceBindings;
+ } else {
+ var provider = ko.bindingProvider['instance'],
+ getBindings = provider['getBindingAccessors'] || getBindingsAndMakeAccessors;
+
+ // Get the binding from the provider within a computed observable so that we can update the bindings whenever
+ // the binding context is updated or if the binding provider accesses observables.
+ var bindingsUpdater = ko.dependentObservable(
+ function() {
+ bindings = sourceBindings ? sourceBindings(bindingContext, node) : getBindings.call(provider, node, bindingContext);
+ // Register a dependency on the binding context to support obsevable view models.
+ if (bindings && bindingContext._subscribable)
+ bindingContext._subscribable();
+ return bindings;
+ },
+ null, { disposeWhenNodeIsRemoved: node }
+ );
+
+ if (!bindings || !bindingsUpdater.isActive())
+ bindingsUpdater = null;
+ }
+
+ var bindingHandlerThatControlsDescendantBindings;
+ if (bindings) {
+ // Return the value accessor for a given binding. When bindings are static (won't be updated because of a binding
+ // context update), just return the value accessor from the binding. Otherwise, return a function that always gets
+ // the latest binding value and registers a dependency on the binding updater.
+ var getValueAccessor = bindingsUpdater
+ ? function(bindingKey) {
+ return function() {
+ return evaluateValueAccessor(bindingsUpdater()[bindingKey]);
+ };
+ } : function(bindingKey) {
+ return bindings[bindingKey];
+ };
+
+ // Use of allBindings as a function is maintained for backwards compatibility, but its use is deprecated
+ function allBindings() {
+ return ko.utils.objectMap(bindingsUpdater ? bindingsUpdater() : bindings, evaluateValueAccessor);
+ }
+ // The following is the 3.x allBindings API
+ allBindings['get'] = function(key) {
+ return bindings[key] && evaluateValueAccessor(getValueAccessor(key));
+ };
+ allBindings['has'] = function(key) {
+ return key in bindings;
+ };
+
+ // First put the bindings into the right order
+ var orderedBindings = topologicalSortBindings(bindings);
+
+ // Go through the sorted bindings, calling init and update for each
+ ko.utils.arrayForEach(orderedBindings, function(bindingKeyAndHandler) {
+ // Note that topologicalSortBindings has already filtered out any nonexistent binding handlers,
+ // so bindingKeyAndHandler.handler will always be nonnull.
+ var handlerInitFn = bindingKeyAndHandler.handler["init"],
+ handlerUpdateFn = bindingKeyAndHandler.handler["update"],
+ bindingKey = bindingKeyAndHandler.key;
+
+ if (node.nodeType === 8) {
+ validateThatBindingIsAllowedForVirtualElements(bindingKey);
+ }
+
+ try {
+ // Run init, ignoring any dependencies
+ if (typeof handlerInitFn == "function") {
+ ko.dependencyDetection.ignore(function() {
+ var initResult = handlerInitFn(node, getValueAccessor(bindingKey), allBindings, bindingContext['$data'], bindingContext);
+
+ // If this binding handler claims to control descendant bindings, make a note of this
+ if (initResult && initResult['controlsDescendantBindings']) {
+ if (bindingHandlerThatControlsDescendantBindings !== undefined)
+ throw new Error("Multiple bindings (" + bindingHandlerThatControlsDescendantBindings + " and " + bindingKey + ") are trying to control descendant bindings of the same element. You cannot use these bindings together on the same element.");
+ bindingHandlerThatControlsDescendantBindings = bindingKey;
+ }
+ });
+ }
+
+ // Run update in its own computed wrapper
+ if (typeof handlerUpdateFn == "function") {
+ ko.dependentObservable(
+ function() {
+ handlerUpdateFn(node, getValueAccessor(bindingKey), allBindings, bindingContext['$data'], bindingContext);
+ },
+ null,
+ { disposeWhenNodeIsRemoved: node }
+ );
+ }
+ } catch (ex) {
+ ex.message = "Unable to process binding \"" + bindingKey + ": " + bindings[bindingKey] + "\"\nMessage: " + ex.message;
+ throw ex;
+ }
+ });
+ }
+
+ return {
+ 'shouldBindDescendants': bindingHandlerThatControlsDescendantBindings === undefined
+ };
+ };
+
+ var storedBindingContextDomDataKey = ko.utils.domData.nextKey();
+ ko.storedBindingContextForNode = function (node, bindingContext) {
+ if (arguments.length == 2) {
+ ko.utils.domData.set(node, storedBindingContextDomDataKey, bindingContext);
+ if (bindingContext._subscribable)
+ bindingContext._subscribable._addNode(node);
+ } else {
+ return ko.utils.domData.get(node, storedBindingContextDomDataKey);
+ }
+ }
+
+ function getBindingContext(viewModelOrBindingContext) {
+ return viewModelOrBindingContext && (viewModelOrBindingContext instanceof ko.bindingContext)
+ ? viewModelOrBindingContext
+ : new ko.bindingContext(viewModelOrBindingContext);
+ }
+
+ ko.applyBindingAccessorsToNode = function (node, bindings, viewModelOrBindingContext) {
+ if (node.nodeType === 1) // If it's an element, workaround IE <= 8 HTML parsing weirdness
+ ko.virtualElements.normaliseVirtualElementDomStructure(node);
+ return applyBindingsToNodeInternal(node, bindings, getBindingContext(viewModelOrBindingContext), true);
+ };
+
+ ko.applyBindingsToNode = function (node, bindings, viewModelOrBindingContext) {
+ var context = getBindingContext(viewModelOrBindingContext);
+ return ko.applyBindingAccessorsToNode(node, makeBindingAccessors(bindings, context, node), context);
+ };
+
+ ko.applyBindingsToDescendants = function(viewModelOrBindingContext, rootNode) {
+ if (rootNode.nodeType === 1 || rootNode.nodeType === 8)
+ applyBindingsToDescendantsInternal(getBindingContext(viewModelOrBindingContext), rootNode, true);
+ };
+
+ ko.applyBindings = function (viewModelOrBindingContext, rootNode) {
+ // If jQuery is loaded after Knockout, we won't initially have access to it. So save it here.
+ if (!jQueryInstance && window['jQuery']) {
+ jQueryInstance = window['jQuery'];
+ }
+
+ if (rootNode && (rootNode.nodeType !== 1) && (rootNode.nodeType !== 8))
+ throw new Error("ko.applyBindings: first parameter should be your view model; second parameter should be a DOM node");
+ rootNode = rootNode || window.document.body; // Make "rootNode" parameter optional
+
+ applyBindingsToNodeAndDescendantsInternal(getBindingContext(viewModelOrBindingContext), rootNode, true);
+ };
+
+ // Retrieving binding context from arbitrary nodes
+ ko.contextFor = function(node) {
+ // We can only do something meaningful for elements and comment nodes (in particular, not text nodes, as IE can't store domdata for them)
+ switch (node.nodeType) {
+ case 1:
+ case 8:
+ var context = ko.storedBindingContextForNode(node);
+ if (context) return context;
+ if (node.parentNode) return ko.contextFor(node.parentNode);
+ break;
+ }
+ return undefined;
+ };
+ ko.dataFor = function(node) {
+ var context = ko.contextFor(node);
+ return context ? context['$data'] : undefined;
+ };
+
+ ko.exportSymbol('bindingHandlers', ko.bindingHandlers);
+ ko.exportSymbol('applyBindings', ko.applyBindings);
+ ko.exportSymbol('applyBindingsToDescendants', ko.applyBindingsToDescendants);
+ ko.exportSymbol('applyBindingAccessorsToNode', ko.applyBindingAccessorsToNode);
+ ko.exportSymbol('applyBindingsToNode', ko.applyBindingsToNode);
+ ko.exportSymbol('contextFor', ko.contextFor);
+ ko.exportSymbol('dataFor', ko.dataFor);
+})();
+(function(undefined) {
+ var loadingSubscribablesCache = {}, // Tracks component loads that are currently in flight
+ loadedDefinitionsCache = {}; // Tracks component loads that have already completed
+
+ ko.components = {
+ get: function(componentName, callback) {
+ var cachedDefinition = getObjectOwnProperty(loadedDefinitionsCache, componentName);
+ if (cachedDefinition) {
+ // It's already loaded and cached. Reuse the same definition object.
+ // Note that for API consistency, even cache hits complete asynchronously by default.
+ // You can bypass this by putting synchronous:true on your component config.
+ if (cachedDefinition.isSynchronousComponent) {
+ ko.dependencyDetection.ignore(function() { // See comment in loaderRegistryBehaviors.js for reasoning
+ callback(cachedDefinition.definition);
+ });
+ } else {
+ setTimeout(function() { callback(cachedDefinition.definition); }, 0);
+ }
+ } else {
+ // Join the loading process that is already underway, or start a new one.
+ loadComponentAndNotify(componentName, callback);
+ }
+ },
+
+ clearCachedDefinition: function(componentName) {
+ delete loadedDefinitionsCache[componentName];
+ },
+
+ _getFirstResultFromLoaders: getFirstResultFromLoaders
+ };
+
+ function getObjectOwnProperty(obj, propName) {
+ return obj.hasOwnProperty(propName) ? obj[propName] : undefined;
+ }
+
+ function loadComponentAndNotify(componentName, callback) {
+ var subscribable = getObjectOwnProperty(loadingSubscribablesCache, componentName),
+ completedAsync;
+ if (!subscribable) {
+ // It's not started loading yet. Start loading, and when it's done, move it to loadedDefinitionsCache.
+ subscribable = loadingSubscribablesCache[componentName] = new ko.subscribable();
+ subscribable.subscribe(callback);
+
+ beginLoadingComponent(componentName, function(definition, config) {
+ var isSynchronousComponent = !!(config && config['synchronous']);
+ loadedDefinitionsCache[componentName] = { definition: definition, isSynchronousComponent: isSynchronousComponent };
+ delete loadingSubscribablesCache[componentName];
+
+ // For API consistency, all loads complete asynchronously. However we want to avoid
+ // adding an extra setTimeout if it's unnecessary (i.e., the completion is already
+ // async) since setTimeout(..., 0) still takes about 16ms or more on most browsers.
+ //
+ // You can bypass the 'always synchronous' feature by putting the synchronous:true
+ // flag on your component configuration when you register it.
+ if (completedAsync || isSynchronousComponent) {
+ // Note that notifySubscribers ignores any dependencies read within the callback.
+ // See comment in loaderRegistryBehaviors.js for reasoning
+ subscribable['notifySubscribers'](definition);
+ } else {
+ setTimeout(function() {
+ subscribable['notifySubscribers'](definition);
+ }, 0);
+ }
+ });
+ completedAsync = true;
+ } else {
+ subscribable.subscribe(callback);
+ }
+ }
+
+ function beginLoadingComponent(componentName, callback) {
+ getFirstResultFromLoaders('getConfig', [componentName], function(config) {
+ if (config) {
+ // We have a config, so now load its definition
+ getFirstResultFromLoaders('loadComponent', [componentName, config], function(definition) {
+ callback(definition, config);
+ });
+ } else {
+ // The component has no config - it's unknown to all the loaders.
+ // Note that this is not an error (e.g., a module loading error) - that would abort the
+ // process and this callback would not run. For this callback to run, all loaders must
+ // have confirmed they don't know about this component.
+ callback(null, null);
+ }
+ });
+ }
+
+ function getFirstResultFromLoaders(methodName, argsExceptCallback, callback, candidateLoaders) {
+ // On the first call in the stack, start with the full set of loaders
+ if (!candidateLoaders) {
+ candidateLoaders = ko.components['loaders'].slice(0); // Use a copy, because we'll be mutating this array
+ }
+
+ // Try the next candidate
+ var currentCandidateLoader = candidateLoaders.shift();
+ if (currentCandidateLoader) {
+ var methodInstance = currentCandidateLoader[methodName];
+ if (methodInstance) {
+ var wasAborted = false,
+ synchronousReturnValue = methodInstance.apply(currentCandidateLoader, argsExceptCallback.concat(function(result) {
+ if (wasAborted) {
+ callback(null);
+ } else if (result !== null) {
+ // This candidate returned a value. Use it.
+ callback(result);
+ } else {
+ // Try the next candidate
+ getFirstResultFromLoaders(methodName, argsExceptCallback, callback, candidateLoaders);
+ }
+ }));
+
+ // Currently, loaders may not return anything synchronously. This leaves open the possibility
+ // that we'll extend the API to support synchronous return values in the future. It won't be
+ // a breaking change, because currently no loader is allowed to return anything except undefined.
+ if (synchronousReturnValue !== undefined) {
+ wasAborted = true;
+
+ // Method to suppress exceptions will remain undocumented. This is only to keep
+ // KO's specs running tidily, since we can observe the loading got aborted without
+ // having exceptions cluttering up the console too.
+ if (!currentCandidateLoader['suppressLoaderExceptions']) {
+ throw new Error('Component loaders must supply values by invoking the callback, not by returning values synchronously.');
+ }
+ }
+ } else {
+ // This candidate doesn't have the relevant handler. Synchronously move on to the next one.
+ getFirstResultFromLoaders(methodName, argsExceptCallback, callback, candidateLoaders);
+ }
+ } else {
+ // No candidates returned a value
+ callback(null);
+ }
+ }
+
+ // Reference the loaders via string name so it's possible for developers
+ // to replace the whole array by assigning to ko.components.loaders
+ ko.components['loaders'] = [];
+
+ ko.exportSymbol('components', ko.components);
+ ko.exportSymbol('components.get', ko.components.get);
+ ko.exportSymbol('components.clearCachedDefinition', ko.components.clearCachedDefinition);
+})();
+(function(undefined) {
+
+ // The default loader is responsible for two things:
+ // 1. Maintaining the default in-memory registry of component configuration objects
+ // (i.e., the thing you're writing to when you call ko.components.register(someName, ...))
+ // 2. Answering requests for components by fetching configuration objects
+ // from that default in-memory registry and resolving them into standard
+ // component definition objects (of the form { createViewModel: ..., template: ... })
+ // Custom loaders may override either of these facilities, i.e.,
+ // 1. To supply configuration objects from some other source (e.g., conventions)
+ // 2. Or, to resolve configuration objects by loading viewmodels/templates via arbitrary logic.
+
+ var defaultConfigRegistry = {};
+
+ ko.components.register = function(componentName, config) {
+ if (!config) {
+ throw new Error('Invalid configuration for ' + componentName);
+ }
+
+ if (ko.components.isRegistered(componentName)) {
+ throw new Error('Component ' + componentName + ' is already registered');
+ }
+
+ defaultConfigRegistry[componentName] = config;
+ }
+
+ ko.components.isRegistered = function(componentName) {
+ return componentName in defaultConfigRegistry;
+ }
+
+ ko.components.unregister = function(componentName) {
+ delete defaultConfigRegistry[componentName];
+ ko.components.clearCachedDefinition(componentName);
+ }
+
+ ko.components.defaultLoader = {
+ 'getConfig': function(componentName, callback) {
+ var result = defaultConfigRegistry.hasOwnProperty(componentName)
+ ? defaultConfigRegistry[componentName]
+ : null;
+ callback(result);
+ },
+
+ 'loadComponent': function(componentName, config, callback) {
+ var errorCallback = makeErrorCallback(componentName);
+ possiblyGetConfigFromAmd(errorCallback, config, function(loadedConfig) {
+ resolveConfig(componentName, errorCallback, loadedConfig, callback);
+ });
+ },
+
+ 'loadTemplate': function(componentName, templateConfig, callback) {
+ resolveTemplate(makeErrorCallback(componentName), templateConfig, callback);
+ },
+
+ 'loadViewModel': function(componentName, viewModelConfig, callback) {
+ resolveViewModel(makeErrorCallback(componentName), viewModelConfig, callback);
+ }
+ };
+
+ var createViewModelKey = 'createViewModel';
+
+ // Takes a config object of the form { template: ..., viewModel: ... }, and asynchronously convert it
+ // into the standard component definition format:
+ // { template: <ArrayOfDomNodes>, createViewModel: function(params, componentInfo) { ... } }.
+ // Since both template and viewModel may need to be resolved asynchronously, both tasks are performed
+ // in parallel, and the results joined when both are ready. We don't depend on any promises infrastructure,
+ // so this is implemented manually below.
+ function resolveConfig(componentName, errorCallback, config, callback) {
+ var result = {},
+ makeCallBackWhenZero = 2,
+ tryIssueCallback = function() {
+ if (--makeCallBackWhenZero === 0) {
+ callback(result);
+ }
+ },
+ templateConfig = config['template'],
+ viewModelConfig = config['viewModel'];
+
+ if (templateConfig) {
+ possiblyGetConfigFromAmd(errorCallback, templateConfig, function(loadedConfig) {
+ ko.components._getFirstResultFromLoaders('loadTemplate', [componentName, loadedConfig], function(resolvedTemplate) {
+ result['template'] = resolvedTemplate;
+ tryIssueCallback();
+ });
+ });
+ } else {
+ tryIssueCallback();
+ }
+
+ if (viewModelConfig) {
+ possiblyGetConfigFromAmd(errorCallback, viewModelConfig, function(loadedConfig) {
+ ko.components._getFirstResultFromLoaders('loadViewModel', [componentName, loadedConfig], function(resolvedViewModel) {
+ result[createViewModelKey] = resolvedViewModel;
+ tryIssueCallback();
+ });
+ });
+ } else {
+ tryIssueCallback();
+ }
+ }
+
+ function resolveTemplate(errorCallback, templateConfig, callback) {
+ if (typeof templateConfig === 'string') {
+ // Markup - parse it
+ callback(ko.utils.parseHtmlFragment(templateConfig));
+ } else if (templateConfig instanceof Array) {
+ // Assume already an array of DOM nodes - pass through unchanged
+ callback(templateConfig);
+ } else if (isDocumentFragment(templateConfig)) {
+ // Document fragment - use its child nodes
+ callback(ko.utils.makeArray(templateConfig.childNodes));
+ } else if (templateConfig['element']) {
+ var element = templateConfig['element'];
+ if (isDomElement(element)) {
+ // Element instance - copy its child nodes
+ callback(cloneNodesFromTemplateSourceElement(element));
+ } else if (typeof element === 'string') {
+ // Element ID - find it, then copy its child nodes
+ var elemInstance = document.getElementById(element);
+ if (elemInstance) {
+ callback(cloneNodesFromTemplateSourceElement(elemInstance));
+ } else {
+ errorCallback('Cannot find element with ID ' + element);
+ }
+ } else {
+ errorCallback('Unknown element type: ' + element);
+ }
+ } else {
+ errorCallback('Unknown template value: ' + templateConfig);
+ }
+ }
+
+ function resolveViewModel(errorCallback, viewModelConfig, callback) {
+ if (typeof viewModelConfig === 'function') {
+ // Constructor - convert to standard factory function format
+ // By design, this does *not* supply componentInfo to the constructor, as the intent is that
+ // componentInfo contains non-viewmodel data (e.g., the component's element) that should only
+ // be used in factory functions, not viewmodel constructors.
+ callback(function (params /*, componentInfo */) {
+ return new viewModelConfig(params);
+ });
+ } else if (typeof viewModelConfig[createViewModelKey] === 'function') {
+ // Already a factory function - use it as-is
+ callback(viewModelConfig[createViewModelKey]);
+ } else if ('instance' in viewModelConfig) {
+ // Fixed object instance - promote to createViewModel format for API consistency
+ var fixedInstance = viewModelConfig['instance'];
+ callback(function (params, componentInfo) {
+ return fixedInstance;
+ });
+ } else if ('viewModel' in viewModelConfig) {
+ // Resolved AMD module whose value is of the form { viewModel: ... }
+ resolveViewModel(errorCallback, viewModelConfig['viewModel'], callback);
+ } else {
+ errorCallback('Unknown viewModel value: ' + viewModelConfig);
+ }
+ }
+
+ function cloneNodesFromTemplateSourceElement(elemInstance) {
+ switch (ko.utils.tagNameLower(elemInstance)) {
+ case 'script':
+ return ko.utils.parseHtmlFragment(elemInstance.text);
+ case 'textarea':
+ return ko.utils.parseHtmlFragment(elemInstance.value);
+ case 'template':
+ // For browsers with proper <template> element support (i.e., where the .content property
+ // gives a document fragment), use that document fragment.
+ if (isDocumentFragment(elemInstance.content)) {
+ return ko.utils.cloneNodes(elemInstance.content.childNodes);
+ }
+ }
+
+ // Regular elements such as <div>, and <template> elements on old browsers that don't really
+ // understand <template> and just treat it as a regular container
+ return ko.utils.cloneNodes(elemInstance.childNodes);
+ }
+
+ function isDomElement(obj) {
+ if (window['HTMLElement']) {
+ return obj instanceof HTMLElement;
+ } else {
+ return obj && obj.tagName && obj.nodeType === 1;
+ }
+ }
+
+ function isDocumentFragment(obj) {
+ if (window['DocumentFragment']) {
+ return obj instanceof DocumentFragment;
+ } else {
+ return obj && obj.nodeType === 11;
+ }
+ }
+
+ function possiblyGetConfigFromAmd(errorCallback, config, callback) {
+ if (typeof config['require'] === 'string') {
+ // The config is the value of an AMD module
+ if (amdRequire || window['require']) {
+ (amdRequire || window['require'])([config['require']], callback);
+ } else {
+ errorCallback('Uses require, but no AMD loader is present');
+ }
+ } else {
+ callback(config);
+ }
+ }
+
+ function makeErrorCallback(componentName) {
+ return function (message) {
+ throw new Error('Component \'' + componentName + '\': ' + message);
+ };
+ }
+
+ ko.exportSymbol('components.register', ko.components.register);
+ ko.exportSymbol('components.isRegistered', ko.components.isRegistered);
+ ko.exportSymbol('components.unregister', ko.components.unregister);
+
+ // Expose the default loader so that developers can directly ask it for configuration
+ // or to resolve configuration
+ ko.exportSymbol('components.defaultLoader', ko.components.defaultLoader);
+
+ // By default, the default loader is the only registered component loader
+ ko.components['loaders'].push(ko.components.defaultLoader);
+
+ // Privately expose the underlying config registry for use in old-IE shim
+ ko.components._allRegisteredComponents = defaultConfigRegistry;
+})();
+(function (undefined) {
+ // Overridable API for determining which component name applies to a given node. By overriding this,
+ // you can for example map specific tagNames to components that are not preregistered.
+ ko.components['getComponentNameForNode'] = function(node) {
+ var tagNameLower = ko.utils.tagNameLower(node);
+ return ko.components.isRegistered(tagNameLower) && tagNameLower;
+ };
+
+ ko.components.addBindingsForCustomElement = function(allBindings, node, bindingContext, valueAccessors) {
+ // Determine if it's really a custom element matching a component
+ if (node.nodeType === 1) {
+ var componentName = ko.components['getComponentNameForNode'](node);
+ if (componentName) {
+ // It does represent a component, so add a component binding for it
+ allBindings = allBindings || {};
+
+ if (allBindings['component']) {
+ // Avoid silently overwriting some other 'component' binding that may already be on the element
+ throw new Error('Cannot use the "component" binding on a custom element matching a component');
+ }
+
+ var componentBindingValue = { 'name': componentName, 'params': getComponentParamsFromCustomElement(node, bindingContext) };
+
+ allBindings['component'] = valueAccessors
+ ? function() { return componentBindingValue; }
+ : componentBindingValue;
+ }
+ }
+
+ return allBindings;
+ }
+
+ var nativeBindingProviderInstance = new ko.bindingProvider();
+
+ function getComponentParamsFromCustomElement(elem, bindingContext) {
+ var paramsAttribute = elem.getAttribute('params');
+
+ if (paramsAttribute) {
+ var params = nativeBindingProviderInstance['parseBindingsString'](paramsAttribute, bindingContext, elem, { 'valueAccessors': true, 'bindingParams': true }),
+ rawParamComputedValues = ko.utils.objectMap(params, function(paramValue, paramName) {
+ return ko.computed(paramValue, null, { disposeWhenNodeIsRemoved: elem });
+ }),
+ result = ko.utils.objectMap(rawParamComputedValues, function(paramValueComputed, paramName) {
+ var paramValue = paramValueComputed.peek();
+ // Does the evaluation of the parameter value unwrap any observables?
+ if (!paramValueComputed.isActive()) {
+ // No it doesn't, so there's no need for any computed wrapper. Just pass through the supplied value directly.
+ // Example: "someVal: firstName, age: 123" (whether or not firstName is an observable/computed)
+ return paramValue;
+ } else {
+ // Yes it does. Supply a computed property that unwraps both the outer (binding expression)
+ // level of observability, and any inner (resulting model value) level of observability.
+ // This means the component doesn't have to worry about multiple unwrapping. If the value is a
+ // writable observable, the computed will also be writable and pass the value on to the observable.
+ return ko.computed({
+ 'read': function() {
+ return ko.utils.unwrapObservable(paramValueComputed());
+ },
+ 'write': ko.isWriteableObservable(paramValue) && function(value) {
+ paramValueComputed()(value);
+ },
+ disposeWhenNodeIsRemoved: elem
+ });
+ }
+ });
+
+ // Give access to the raw computeds, as long as that wouldn't overwrite any custom param also called '$raw'
+ // This is in case the developer wants to react to outer (binding) observability separately from inner
+ // (model value) observability, or in case the model value observable has subobservables.
+ if (!result.hasOwnProperty('$raw')) {
+ result['$raw'] = rawParamComputedValues;
+ }
+
+ return result;
+ } else {
+ // For consistency, absence of a "params" attribute is treated the same as the presence of
+ // any empty one. Otherwise component viewmodels need special code to check whether or not
+ // 'params' or 'params.$raw' is null/undefined before reading subproperties, which is annoying.
+ return { '$raw': {} };
+ }
+ }
+
+ // --------------------------------------------------------------------------------
+ // Compatibility code for older (pre-HTML5) IE browsers
+
+ if (ko.utils.ieVersion < 9) {
+ // Whenever you preregister a component, enable it as a custom element in the current document
+ ko.components['register'] = (function(originalFunction) {
+ return function(componentName) {
+ document.createElement(componentName); // Allows IE<9 to parse markup containing the custom element
+ return originalFunction.apply(this, arguments);
+ }
+ })(ko.components['register']);
+
+ // Whenever you create a document fragment, enable all preregistered component names as custom elements
+ // This is needed to make innerShiv/jQuery HTML parsing correctly handle the custom elements
+ document.createDocumentFragment = (function(originalFunction) {
+ return function() {
+ var newDocFrag = originalFunction(),
+ allComponents = ko.components._allRegisteredComponents;
+ for (var componentName in allComponents) {
+ if (allComponents.hasOwnProperty(componentName)) {
+ newDocFrag.createElement(componentName);
+ }
+ }
+ return newDocFrag;
+ };
+ })(document.createDocumentFragment);
+ }
+})();(function(undefined) {
+
+ var componentLoadingOperationUniqueId = 0;
+
+ ko.bindingHandlers['component'] = {
+ 'init': function(element, valueAccessor, ignored1, ignored2, bindingContext) {
+ var currentViewModel,
+ currentLoadingOperationId,
+ disposeAssociatedComponentViewModel = function () {
+ var currentViewModelDispose = currentViewModel && currentViewModel['dispose'];
+ if (typeof currentViewModelDispose === 'function') {
+ currentViewModelDispose.call(currentViewModel);
+ }
+
+ // Any in-flight loading operation is no longer relevant, so make sure we ignore its completion
+ currentLoadingOperationId = null;
+ },
+ originalChildNodes = ko.utils.makeArray(ko.virtualElements.childNodes(element));
+
+ ko.utils.domNodeDisposal.addDisposeCallback(element, disposeAssociatedComponentViewModel);
+
+ ko.computed(function () {
+ var value = ko.utils.unwrapObservable(valueAccessor()),
+ componentName, componentParams;
+
+ if (typeof value === 'string') {
+ componentName = value;
+ } else {
+ componentName = ko.utils.unwrapObservable(value['name']);
+ componentParams = ko.utils.unwrapObservable(value['params']);
+ }
+
+ if (!componentName) {
+ throw new Error('No component name specified');
+ }
+
+ var loadingOperationId = currentLoadingOperationId = ++componentLoadingOperationUniqueId;
+ ko.components.get(componentName, function(componentDefinition) {
+ // If this is not the current load operation for this element, ignore it.
+ if (currentLoadingOperationId !== loadingOperationId) {
+ return;
+ }
+
+ // Clean up previous state
+ disposeAssociatedComponentViewModel();
+
+ // Instantiate and bind new component. Implicitly this cleans any old DOM nodes.
+ if (!componentDefinition) {
+ throw new Error('Unknown component \'' + componentName + '\'');
+ }
+ cloneTemplateIntoElement(componentName, componentDefinition, element);
+ var componentViewModel = createViewModel(componentDefinition, element, originalChildNodes, componentParams),
+ childBindingContext = bindingContext['createChildContext'](componentViewModel, /* dataItemAlias */ undefined, function(ctx) {
+ ctx['$component'] = componentViewModel;
+ ctx['$componentTemplateNodes'] = originalChildNodes;
+ });
+ currentViewModel = componentViewModel;
+ ko.applyBindingsToDescendants(childBindingContext, element);
+ });
+ }, null, { disposeWhenNodeIsRemoved: element });
+
+ return { 'controlsDescendantBindings': true };
+ }
+ };
+
+ ko.virtualElements.allowedBindings['component'] = true;
+
+ function cloneTemplateIntoElement(componentName, componentDefinition, element) {
+ var template = componentDefinition['template'];
+ if (!template) {
+ throw new Error('Component \'' + componentName + '\' has no template');
+ }
+
+ var clonedNodesArray = ko.utils.cloneNodes(template);
+ ko.virtualElements.setDomNodeChildren(element, clonedNodesArray);
+ }
+
+ function createViewModel(componentDefinition, element, originalChildNodes, componentParams) {
+ var componentViewModelFactory = componentDefinition['createViewModel'];
+ return componentViewModelFactory
+ ? componentViewModelFactory.call(componentDefinition, componentParams, { 'element': element, 'templateNodes': originalChildNodes })
+ : componentParams; // Template-only component
+ }
+
+})();
+var attrHtmlToJavascriptMap = { 'class': 'className', 'for': 'htmlFor' };
+ko.bindingHandlers['attr'] = {
+ 'update': function(element, valueAccessor, allBindings) {
+ var value = ko.utils.unwrapObservable(valueAccessor()) || {};
+ ko.utils.objectForEach(value, function(attrName, attrValue) {
+ attrValue = ko.utils.unwrapObservable(attrValue);
+
+ // To cover cases like "attr: { checked:someProp }", we want to remove the attribute entirely
+ // when someProp is a "no value"-like value (strictly null, false, or undefined)
+ // (because the absence of the "checked" attr is how to mark an element as not checked, etc.)
+ var toRemove = (attrValue === false) || (attrValue === null) || (attrValue === undefined);
+ if (toRemove)
+ element.removeAttribute(attrName);
+
+ // In IE <= 7 and IE8 Quirks Mode, you have to use the Javascript property name instead of the
+ // HTML attribute name for certain attributes. IE8 Standards Mode supports the correct behavior,
+ // but instead of figuring out the mode, we'll just set the attribute through the Javascript
+ // property for IE <= 8.
+ if (ko.utils.ieVersion <= 8 && attrName in attrHtmlToJavascriptMap) {
+ attrName = attrHtmlToJavascriptMap[attrName];
+ if (toRemove)
+ element.removeAttribute(attrName);
+ else
+ element[attrName] = attrValue;
+ } else if (!toRemove) {
+ element.setAttribute(attrName, attrValue.toString());
+ }
+
+ // Treat "name" specially - although you can think of it as an attribute, it also needs
+ // special handling on older versions of IE (https://github.com/SteveSanderson/knockout/pull/333)
+ // Deliberately being case-sensitive here because XHTML would regard "Name" as a different thing
+ // entirely, and there's no strong reason to allow for such casing in HTML.
+ if (attrName === "name") {
+ ko.utils.setElementName(element, toRemove ? "" : attrValue.toString());
+ }
+ });
+ }
+};
+(function() {
+
+ko.bindingHandlers['checked'] = {
+ 'after': ['value', 'attr'],
+ 'init': function (element, valueAccessor, allBindings) {
+ var checkedValue = ko.pureComputed(function() {
+ // Treat "value" like "checkedValue" when it is included with "checked" binding
+ if (allBindings['has']('checkedValue')) {
+ return ko.utils.unwrapObservable(allBindings.get('checkedValue'));
+ } else if (allBindings['has']('value')) {
+ return ko.utils.unwrapObservable(allBindings.get('value'));
+ }
+
+ return element.value;
+ });
+
+ function updateModel() {
+ // This updates the model value from the view value.
+ // It runs in response to DOM events (click) and changes in checkedValue.
+ var isChecked = element.checked,
+ elemValue = useCheckedValue ? checkedValue() : isChecked;
+
+ // When we're first setting up this computed, don't change any model state.
+ if (ko.computedContext.isInitial()) {
+ return;
+ }
+
+ // We can ignore unchecked radio buttons, because some other radio
+ // button will be getting checked, and that one can take care of updating state.
+ if (isRadio && !isChecked) {
+ return;
+ }
+
+ var modelValue = ko.dependencyDetection.ignore(valueAccessor);
+ if (isValueArray) {
+ if (oldElemValue !== elemValue) {
+ // When we're responding to the checkedValue changing, and the element is
+ // currently checked, replace the old elem value with the new elem value
+ // in the model array.
+ if (isChecked) {
+ ko.utils.addOrRemoveItem(modelValue, elemValue, true);
+ ko.utils.addOrRemoveItem(modelValue, oldElemValue, false);
+ }
+
+ oldElemValue = elemValue;
+ } else {
+ // When we're responding to the user having checked/unchecked a checkbox,
+ // add/remove the element value to the model array.
+ ko.utils.addOrRemoveItem(modelValue, elemValue, isChecked);
+ }
+ } else {
+ ko.expressionRewriting.writeValueToProperty(modelValue, allBindings, 'checked', elemValue, true);
+ }
+ };
+
+ function updateView() {
+ // This updates the view value from the model value.
+ // It runs in response to changes in the bound (checked) value.
+ var modelValue = ko.utils.unwrapObservable(valueAccessor());
+
+ if (isValueArray) {
+ // When a checkbox is bound to an array, being checked represents its value being present in that array
+ element.checked = ko.utils.arrayIndexOf(modelValue, checkedValue()) >= 0;
+ } else if (isCheckbox) {
+ // When a checkbox is bound to any other value (not an array), being checked represents the value being trueish
+ element.checked = modelValue;
+ } else {
+ // For radio buttons, being checked means that the radio button's value corresponds to the model value
+ element.checked = (checkedValue() === modelValue);
+ }
+ };
+
+ var isCheckbox = element.type == "checkbox",
+ isRadio = element.type == "radio";
+
+ // Only bind to check boxes and radio buttons
+ if (!isCheckbox && !isRadio) {
+ return;
+ }
+
+ var isValueArray = isCheckbox && (ko.utils.unwrapObservable(valueAccessor()) instanceof Array),
+ oldElemValue = isValueArray ? checkedValue() : undefined,
+ useCheckedValue = isRadio || isValueArray;
+
+ // IE 6 won't allow radio buttons to be selected unless they have a name
+ if (isRadio && !element.name)
+ ko.bindingHandlers['uniqueName']['init'](element, function() { return true });
+
+ // Set up two computeds to update the binding:
+
+ // The first responds to changes in the checkedValue value and to element clicks
+ ko.computed(updateModel, null, { disposeWhenNodeIsRemoved: element });
+ ko.utils.registerEventHandler(element, "click", updateModel);
+
+ // The second responds to changes in the model value (the one associated with the checked binding)
+ ko.computed(updateView, null, { disposeWhenNodeIsRemoved: element });
+ }
+};
+ko.expressionRewriting.twoWayBindings['checked'] = true;
+
+ko.bindingHandlers['checkedValue'] = {
+ 'update': function (element, valueAccessor) {
+ element.value = ko.utils.unwrapObservable(valueAccessor());
+ }
+};
+
+})();var classesWrittenByBindingKey = '__ko__cssValue';
+ko.bindingHandlers['css'] = {
+ 'update': function (element, valueAccessor) {
+ var value = ko.utils.unwrapObservable(valueAccessor());
+ if (value !== null && typeof value == "object") {
+ ko.utils.objectForEach(value, function(className, shouldHaveClass) {
+ shouldHaveClass = ko.utils.unwrapObservable(shouldHaveClass);
+ ko.utils.toggleDomNodeCssClass(element, className, shouldHaveClass);
+ });
+ } else {
+ value = String(value || ''); // Make sure we don't try to store or set a non-string value
+ ko.utils.toggleDomNodeCssClass(element, element[classesWrittenByBindingKey], false);
+ element[classesWrittenByBindingKey] = value;
+ ko.utils.toggleDomNodeCssClass(element, value, true);
+ }
+ }
+};
+ko.bindingHandlers['enable'] = {
+ 'update': function (element, valueAccessor) {
+ var value = ko.utils.unwrapObservable(valueAccessor());
+ if (value && element.disabled)
+ element.removeAttribute("disabled");
+ else if ((!value) && (!element.disabled))
+ element.disabled = true;
+ }
+};
+
+ko.bindingHandlers['disable'] = {
+ 'update': function (element, valueAccessor) {
+ ko.bindingHandlers['enable']['update'](element, function() { return !ko.utils.unwrapObservable(valueAccessor()) });
+ }
+};
+// For certain common events (currently just 'click'), allow a simplified data-binding syntax
+// e.g. click:handler instead of the usual full-length event:{click:handler}
+function makeEventHandlerShortcut(eventName) {
+ ko.bindingHandlers[eventName] = {
+ 'init': function(element, valueAccessor, allBindings, viewModel, bindingContext) {
+ var newValueAccessor = function () {
+ var result = {};
+ result[eventName] = valueAccessor();
+ return result;
+ };
+ return ko.bindingHandlers['event']['init'].call(this, element, newValueAccessor, allBindings, viewModel, bindingContext);
+ }
+ }
+}
+
+ko.bindingHandlers['event'] = {
+ 'init' : function (element, valueAccessor, allBindings, viewModel, bindingContext) {
+ var eventsToHandle = valueAccessor() || {};
+ ko.utils.objectForEach(eventsToHandle, function(eventName) {
+ if (typeof eventName == "string") {
+ ko.utils.registerEventHandler(element, eventName, function (event) {
+ var handlerReturnValue;
+ var handlerFunction = valueAccessor()[eventName];
+ if (!handlerFunction)
+ return;
+
+ try {
+ // Take all the event args, and prefix with the viewmodel
+ var argsForHandler = ko.utils.makeArray(arguments);
+ viewModel = bindingContext['$data'];
+ argsForHandler.unshift(viewModel);
+ handlerReturnValue = handlerFunction.apply(viewModel, argsForHandler);
+ } finally {
+ if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true.
+ if (event.preventDefault)
+ event.preventDefault();
+ else
+ event.returnValue = false;
+ }
+ }
+
+ var bubble = allBindings.get(eventName + 'Bubble') !== false;
+ if (!bubble) {
+ event.cancelBubble = true;
+ if (event.stopPropagation)
+ event.stopPropagation();
+ }
+ });
+ }
+ });
+ }
+};
+// "foreach: someExpression" is equivalent to "template: { foreach: someExpression }"
+// "foreach: { data: someExpression, afterAdd: myfn }" is equivalent to "template: { foreach: someExpression, afterAdd: myfn }"
+ko.bindingHandlers['foreach'] = {
+ makeTemplateValueAccessor: function(valueAccessor) {
+ return function() {
+ var modelValue = valueAccessor(),
+ unwrappedValue = ko.utils.peekObservable(modelValue); // Unwrap without setting a dependency here
+
+ // If unwrappedValue is the array, pass in the wrapped value on its own
+ // The value will be unwrapped and tracked within the template binding
+ // (See https://github.com/SteveSanderson/knockout/issues/523)
+ if ((!unwrappedValue) || typeof unwrappedValue.length == "number")
+ return { 'foreach': modelValue, 'templateEngine': ko.nativeTemplateEngine.instance };
+
+ // If unwrappedValue.data is the array, preserve all relevant options and unwrap again value so we get updates
+ ko.utils.unwrapObservable(modelValue);
+ return {
+ 'foreach': unwrappedValue['data'],
+ 'as': unwrappedValue['as'],
+ 'includeDestroyed': unwrappedValue['includeDestroyed'],
+ 'afterAdd': unwrappedValue['afterAdd'],
+ 'beforeRemove': unwrappedValue['beforeRemove'],
+ 'afterRender': unwrappedValue['afterRender'],
+ 'beforeMove': unwrappedValue['beforeMove'],
+ 'afterMove': unwrappedValue['afterMove'],
+ 'templateEngine': ko.nativeTemplateEngine.instance
+ };
+ };
+ },
+ 'init': function(element, valueAccessor, allBindings, viewModel, bindingContext) {
+ return ko.bindingHandlers['template']['init'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor));
+ },
+ 'update': function(element, valueAccessor, allBindings, viewModel, bindingContext) {
+ return ko.bindingHandlers['template']['update'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor), allBindings, viewModel, bindingContext);
+ }
+};
+ko.expressionRewriting.bindingRewriteValidators['foreach'] = false; // Can't rewrite control flow bindings
+ko.virtualElements.allowedBindings['foreach'] = true;
+var hasfocusUpdatingProperty = '__ko_hasfocusUpdating';
+var hasfocusLastValue = '__ko_hasfocusLastValue';
+ko.bindingHandlers['hasfocus'] = {
+ 'init': function(element, valueAccessor, allBindings) {
+ var handleElementFocusChange = function(isFocused) {
+ // Where possible, ignore which event was raised and determine focus state using activeElement,
+ // as this avoids phantom focus/blur events raised when changing tabs in modern browsers.
+ // However, not all KO-targeted browsers (Firefox 2) support activeElement. For those browsers,
+ // prevent a loss of focus when changing tabs/windows by setting a flag that prevents hasfocus
+ // from calling 'blur()' on the element when it loses focus.
+ // Discussion at https://github.com/SteveSanderson/knockout/pull/352
+ element[hasfocusUpdatingProperty] = true;
+ var ownerDoc = element.ownerDocument;
+ if ("activeElement" in ownerDoc) {
+ var active;
+ try {
+ active = ownerDoc.activeElement;
+ } catch(e) {
+ // IE9 throws if you access activeElement during page load (see issue #703)
+ active = ownerDoc.body;
+ }
+ isFocused = (active === element);
+ }
+ var modelValue = valueAccessor();
+ ko.expressionRewriting.writeValueToProperty(modelValue, allBindings, 'hasfocus', isFocused, true);
+
+ //cache the latest value, so we can avoid unnecessarily calling focus/blur in the update function
+ element[hasfocusLastValue] = isFocused;
+ element[hasfocusUpdatingProperty] = false;
+ };
+ var handleElementFocusIn = handleElementFocusChange.bind(null, true);
+ var handleElementFocusOut = handleElementFocusChange.bind(null, false);
+
+ ko.utils.registerEventHandler(element, "focus", handleElementFocusIn);
+ ko.utils.registerEventHandler(element, "focusin", handleElementFocusIn); // For IE
+ ko.utils.registerEventHandler(element, "blur", handleElementFocusOut);
+ ko.utils.registerEventHandler(element, "focusout", handleElementFocusOut); // For IE
+ },
+ 'update': function(element, valueAccessor) {
+ var value = !!ko.utils.unwrapObservable(valueAccessor()); //force boolean to compare with last value
+ if (!element[hasfocusUpdatingProperty] && element[hasfocusLastValue] !== value) {
+ value ? element.focus() : element.blur();
+ ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, value ? "focusin" : "focusout"]); // For IE, which doesn't reliably fire "focus" or "blur" events synchronously
+ }
+ }
+};
+ko.expressionRewriting.twoWayBindings['hasfocus'] = true;
+
+ko.bindingHandlers['hasFocus'] = ko.bindingHandlers['hasfocus']; // Make "hasFocus" an alias
+ko.expressionRewriting.twoWayBindings['hasFocus'] = true;
+ko.bindingHandlers['html'] = {
+ 'init': function() {
+ // Prevent binding on the dynamically-injected HTML (as developers are unlikely to expect that, and it has security implications)
+ return { 'controlsDescendantBindings': true };
+ },
+ 'update': function (element, valueAccessor) {
+ // setHtml will unwrap the value if needed
+ ko.utils.setHtml(element, valueAccessor());
+ }
+};
+// Makes a binding like with or if
+function makeWithIfBinding(bindingKey, isWith, isNot, makeContextCallback) {
+ ko.bindingHandlers[bindingKey] = {
+ 'init': function(element, valueAccessor, allBindings, viewModel, bindingContext) {
+ var didDisplayOnLastUpdate,
+ savedNodes;
+ ko.computed(function() {
+ var dataValue = ko.utils.unwrapObservable(valueAccessor()),
+ shouldDisplay = !isNot !== !dataValue, // equivalent to isNot ? !dataValue : !!dataValue
+ isFirstRender = !savedNodes,
+ needsRefresh = isFirstRender || isWith || (shouldDisplay !== didDisplayOnLastUpdate);
+
+ if (needsRefresh) {
+ // Save a copy of the inner nodes on the initial update, but only if we have dependencies.
+ if (isFirstRender && ko.computedContext.getDependenciesCount()) {
+ savedNodes = ko.utils.cloneNodes(ko.virtualElements.childNodes(element), true /* shouldCleanNodes */);
+ }
+
+ if (shouldDisplay) {
+ if (!isFirstRender) {
+ ko.virtualElements.setDomNodeChildren(element, ko.utils.cloneNodes(savedNodes));
+ }
+ ko.applyBindingsToDescendants(makeContextCallback ? makeContextCallback(bindingContext, dataValue) : bindingContext, element);
+ } else {
+ ko.virtualElements.emptyNode(element);
+ }
+
+ didDisplayOnLastUpdate = shouldDisplay;
+ }
+ }, null, { disposeWhenNodeIsRemoved: element });
+ return { 'controlsDescendantBindings': true };
+ }
+ };
+ ko.expressionRewriting.bindingRewriteValidators[bindingKey] = false; // Can't rewrite control flow bindings
+ ko.virtualElements.allowedBindings[bindingKey] = true;
+}
+
+// Construct the actual binding handlers
+makeWithIfBinding('if');
+makeWithIfBinding('ifnot', false /* isWith */, true /* isNot */);
+makeWithIfBinding('with', true /* isWith */, false /* isNot */,
+ function(bindingContext, dataValue) {
+ return bindingContext['createChildContext'](dataValue);
+ }
+);
+var captionPlaceholder = {};
+ko.bindingHandlers['options'] = {
+ 'init': function(element) {
+ if (ko.utils.tagNameLower(element) !== "select")
+ throw new Error("options binding applies only to SELECT elements");
+
+ // Remove all existing <option>s.
+ while (element.length > 0) {
+ element.remove(0);
+ }
+
+ // Ensures that the binding processor doesn't try to bind the options
+ return { 'controlsDescendantBindings': true };
+ },
+ 'update': function (element, valueAccessor, allBindings) {
+ function selectedOptions() {
+ return ko.utils.arrayFilter(element.options, function (node) { return node.selected; });
+ }
+
+ var selectWasPreviouslyEmpty = element.length == 0,
+ multiple = element.multiple,
+ previousScrollTop = (!selectWasPreviouslyEmpty && multiple) ? element.scrollTop : null,
+ unwrappedArray = ko.utils.unwrapObservable(valueAccessor()),
+ valueAllowUnset = allBindings.get('valueAllowUnset') && allBindings['has']('value'),
+ includeDestroyed = allBindings.get('optionsIncludeDestroyed'),
+ arrayToDomNodeChildrenOptions = {},
+ captionValue,
+ filteredArray,
+ previousSelectedValues = [];
+
+ if (!valueAllowUnset) {
+ if (multiple) {
+ previousSelectedValues = ko.utils.arrayMap(selectedOptions(), ko.selectExtensions.readValue);
+ } else if (element.selectedIndex >= 0) {
+ previousSelectedValues.push(ko.selectExtensions.readValue(element.options[element.selectedIndex]));
+ }
+ }
+
+ if (unwrappedArray) {
+ if (typeof unwrappedArray.length == "undefined") // Coerce single value into array
+ unwrappedArray = [unwrappedArray];
+
+ // Filter out any entries marked as destroyed
+ filteredArray = ko.utils.arrayFilter(unwrappedArray, function(item) {
+ return includeDestroyed || item === undefined || item === null || !ko.utils.unwrapObservable(item['_destroy']);
+ });
+
+ // If caption is included, add it to the array
+ if (allBindings['has']('optionsCaption')) {
+ captionValue = ko.utils.unwrapObservable(allBindings.get('optionsCaption'));
+ // If caption value is null or undefined, don't show a caption
+ if (captionValue !== null && captionValue !== undefined) {
+ filteredArray.unshift(captionPlaceholder);
+ }
+ }
+ } else {
+ // If a falsy value is provided (e.g. null), we'll simply empty the select element
+ }
+
+ function applyToObject(object, predicate, defaultValue) {
+ var predicateType = typeof predicate;
+ if (predicateType == "function") // Given a function; run it against the data value
+ return predicate(object);
+ else if (predicateType == "string") // Given a string; treat it as a property name on the data value
+ return object[predicate];
+ else // Given no optionsText arg; use the data value itself
+ return defaultValue;
+ }
+
+ // The following functions can run at two different times:
+ // The first is when the whole array is being updated directly from this binding handler.
+ // The second is when an observable value for a specific array entry is updated.
+ // oldOptions will be empty in the first case, but will be filled with the previously generated option in the second.
+ var itemUpdate = false;
+ function optionForArrayItem(arrayEntry, index, oldOptions) {
+ if (oldOptions.length) {
+ previousSelectedValues = !valueAllowUnset && oldOptions[0].selected ? [ ko.selectExtensions.readValue(oldOptions[0]) ] : [];
+ itemUpdate = true;
+ }
+ var option = element.ownerDocument.createElement("option");
+ if (arrayEntry === captionPlaceholder) {
+ ko.utils.setTextContent(option, allBindings.get('optionsCaption'));
+ ko.selectExtensions.writeValue(option, undefined);
+ } else {
+ // Apply a value to the option element
+ var optionValue = applyToObject(arrayEntry, allBindings.get('optionsValue'), arrayEntry);
+ ko.selectExtensions.writeValue(option, ko.utils.unwrapObservable(optionValue));
+
+ // Apply some text to the option element
+ var optionText = applyToObject(arrayEntry, allBindings.get('optionsText'), optionValue);
+ ko.utils.setTextContent(option, optionText);
+ }
+ return [option];
+ }
+
+ // By using a beforeRemove callback, we delay the removal until after new items are added. This fixes a selection
+ // problem in IE<=8 and Firefox. See https://github.com/knockout/knockout/issues/1208
+ arrayToDomNodeChildrenOptions['beforeRemove'] =
+ function (option) {
+ element.removeChild(option);
+ };
+
+ function setSelectionCallback(arrayEntry, newOptions) {
+ if (itemUpdate && valueAllowUnset) {
+ // The model value is authoritative, so make sure its value is the one selected
+ // There is no need to use dependencyDetection.ignore since setDomNodeChildrenFromArrayMapping does so already.
+ ko.selectExtensions.writeValue(element, ko.utils.unwrapObservable(allBindings.get('value')), true /* allowUnset */);
+ } else if (previousSelectedValues.length) {
+ // IE6 doesn't like us to assign selection to OPTION nodes before they're added to the document.
+ // That's why we first added them without selection. Now it's time to set the selection.
+ var isSelected = ko.utils.arrayIndexOf(previousSelectedValues, ko.selectExtensions.readValue(newOptions[0])) >= 0;
+ ko.utils.setOptionNodeSelectionState(newOptions[0], isSelected);
+
+ // If this option was changed from being selected during a single-item update, notify the change
+ if (itemUpdate && !isSelected) {
+ ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, "change"]);
+ }
+ }
+ }
+
+ var callback = setSelectionCallback;
+ if (allBindings['has']('optionsAfterRender') && typeof allBindings.get('optionsAfterRender') == "function") {
+ callback = function(arrayEntry, newOptions) {
+ setSelectionCallback(arrayEntry, newOptions);
+ ko.dependencyDetection.ignore(allBindings.get('optionsAfterRender'), null, [newOptions[0], arrayEntry !== captionPlaceholder ? arrayEntry : undefined]);
+ }
+ }
+
+ ko.utils.setDomNodeChildrenFromArrayMapping(element, filteredArray, optionForArrayItem, arrayToDomNodeChildrenOptions, callback);
+
+ ko.dependencyDetection.ignore(function () {
+ if (valueAllowUnset) {
+ // The model value is authoritative, so make sure its value is the one selected
+ ko.selectExtensions.writeValue(element, ko.utils.unwrapObservable(allBindings.get('value')), true /* allowUnset */);
+ } else {
+ // Determine if the selection has changed as a result of updating the options list
+ var selectionChanged;
+ if (multiple) {
+ // For a multiple-select box, compare the new selection count to the previous one
+ // But if nothing was selected before, the selection can't have changed
+ selectionChanged = previousSelectedValues.length && selectedOptions().length < previousSelectedValues.length;
+ } else {
+ // For a single-select box, compare the current value to the previous value
+ // But if nothing was selected before or nothing is selected now, just look for a change in selection
+ selectionChanged = (previousSelectedValues.length && element.selectedIndex >= 0)
+ ? (ko.selectExtensions.readValue(element.options[element.selectedIndex]) !== previousSelectedValues[0])
+ : (previousSelectedValues.length || element.selectedIndex >= 0);
+ }
+
+ // Ensure consistency between model value and selected option.
+ // If the dropdown was changed so that selection is no longer the same,
+ // notify the value or selectedOptions binding.
+ if (selectionChanged) {
+ ko.utils.triggerEvent(element, "change");
+ }
+ }
+ });
+
+ // Workaround for IE bug
+ ko.utils.ensureSelectElementIsRenderedCorrectly(element);
+
+ if (previousScrollTop && Math.abs(previousScrollTop - element.scrollTop) > 20)
+ element.scrollTop = previousScrollTop;
+ }
+};
+ko.bindingHandlers['options'].optionValueDomDataKey = ko.utils.domData.nextKey();
+ko.bindingHandlers['selectedOptions'] = {
+ 'after': ['options', 'foreach'],
+ 'init': function (element, valueAccessor, allBindings) {
+ ko.utils.registerEventHandler(element, "change", function () {
+ var value = valueAccessor(), valueToWrite = [];
+ ko.utils.arrayForEach(element.getElementsByTagName("option"), function(node) {
+ if (node.selected)
+ valueToWrite.push(ko.selectExtensions.readValue(node));
+ });
+ ko.expressionRewriting.writeValueToProperty(value, allBindings, 'selectedOptions', valueToWrite);
+ });
+ },
+ 'update': function (element, valueAccessor) {
+ if (ko.utils.tagNameLower(element) != "select")
+ throw new Error("values binding applies only to SELECT elements");
+
+ var newValue = ko.utils.unwrapObservable(valueAccessor());
+ if (newValue && typeof newValue.length == "number") {
+ ko.utils.arrayForEach(element.getElementsByTagName("option"), function(node) {
+ var isSelected = ko.utils.arrayIndexOf(newValue, ko.selectExtensions.readValue(node)) >= 0;
+ ko.utils.setOptionNodeSelectionState(node, isSelected);
+ });
+ }
+ }
+};
+ko.expressionRewriting.twoWayBindings['selectedOptions'] = true;
+ko.bindingHandlers['style'] = {
+ 'update': function (element, valueAccessor) {
+ var value = ko.utils.unwrapObservable(valueAccessor() || {});
+ ko.utils.objectForEach(value, function(styleName, styleValue) {
+ styleValue = ko.utils.unwrapObservable(styleValue);
+
+ if (styleValue === null || styleValue === undefined || styleValue === false) {
+ // Empty string removes the value, whereas null/undefined have no effect
+ styleValue = "";
+ }
+
+ element.style[styleName] = styleValue;
+ });
+ }
+};
+ko.bindingHandlers['submit'] = {
+ 'init': function (element, valueAccessor, allBindings, viewModel, bindingContext) {
+ if (typeof valueAccessor() != "function")
+ throw new Error("The value for a submit binding must be a function");
+ ko.utils.registerEventHandler(element, "submit", function (event) {
+ var handlerReturnValue;
+ var value = valueAccessor();
+ try { handlerReturnValue = value.call(bindingContext['$data'], element); }
+ finally {
+ if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true.
+ if (event.preventDefault)
+ event.preventDefault();
+ else
+ event.returnValue = false;
+ }
+ }
+ });
+ }
+};
+ko.bindingHandlers['text'] = {
+ 'init': function() {
+ // Prevent binding on the dynamically-injected text node (as developers are unlikely to expect that, and it has security implications).
+ // It should also make things faster, as we no longer have to consider whether the text node might be bindable.
+ return { 'controlsDescendantBindings': true };
+ },
+ 'update': function (element, valueAccessor) {
+ ko.utils.setTextContent(element, valueAccessor());
+ }
+};
+ko.virtualElements.allowedBindings['text'] = true;
+(function () {
+
+if (window && window.navigator) {
+ var parseVersion = function (matches) {
+ if (matches) {
+ return parseFloat(matches[1]);
+ }
+ };
+
+ // Detect various browser versions because some old versions don't fully support the 'input' event
+ var operaVersion = window.opera && window.opera.version && parseInt(window.opera.version()),
+ userAgent = window.navigator.userAgent,
+ safariVersion = parseVersion(userAgent.match(/^(?:(?!chrome).)*version\/([^ ]*) safari/i)),
+ firefoxVersion = parseVersion(userAgent.match(/Firefox\/([^ ]*)/));
+}
+
+// IE 8 and 9 have bugs that prevent the normal events from firing when the value changes.
+// But it does fire the 'selectionchange' event on many of those, presumably because the
+// cursor is moving and that counts as the selection changing. The 'selectionchange' event is
+// fired at the document level only and doesn't directly indicate which element changed. We
+// set up just one event handler for the document and use 'activeElement' to determine which
+// element was changed.
+if (ko.utils.ieVersion < 10) {
+ var selectionChangeRegisteredName = ko.utils.domData.nextKey(),
+ selectionChangeHandlerName = ko.utils.domData.nextKey();
+ var selectionChangeHandler = function(event) {
+ var target = this.activeElement,
+ handler = target && ko.utils.domData.get(target, selectionChangeHandlerName);
+ if (handler) {
+ handler(event);
+ }
+ };
+ var registerForSelectionChangeEvent = function (element, handler) {
+ var ownerDoc = element.ownerDocument;
+ if (!ko.utils.domData.get(ownerDoc, selectionChangeRegisteredName)) {
+ ko.utils.domData.set(ownerDoc, selectionChangeRegisteredName, true);
+ ko.utils.registerEventHandler(ownerDoc, 'selectionchange', selectionChangeHandler);
+ }
+ ko.utils.domData.set(element, selectionChangeHandlerName, handler);
+ };
+}
+
+ko.bindingHandlers['textInput'] = {
+ 'init': function (element, valueAccessor, allBindings) {
+
+ var previousElementValue = element.value,
+ timeoutHandle,
+ elementValueBeforeEvent;
+
+ var updateModel = function (event) {
+ clearTimeout(timeoutHandle);
+ elementValueBeforeEvent = timeoutHandle = undefined;
+
+ var elementValue = element.value;
+ if (previousElementValue !== elementValue) {
+ // Provide a way for tests to know exactly which event was processed
+ if (DEBUG && event) element['_ko_textInputProcessedEvent'] = event.type;
+ previousElementValue = elementValue;
+ ko.expressionRewriting.writeValueToProperty(valueAccessor(), allBindings, 'textInput', elementValue);
+ }
+ };
+
+ var deferUpdateModel = function (event) {
+ if (!timeoutHandle) {
+ // The elementValueBeforeEvent variable is set *only* during the brief gap between an
+ // event firing and the updateModel function running. This allows us to ignore model
+ // updates that are from the previous state of the element, usually due to techniques
+ // such as rateLimit. Such updates, if not ignored, can cause keystrokes to be lost.
+ elementValueBeforeEvent = element.value;
+ var handler = DEBUG ? updateModel.bind(element, {type: event.type}) : updateModel;
+ timeoutHandle = setTimeout(handler, 4);
+ }
+ };
+
+ var updateView = function () {
+ var modelValue = ko.utils.unwrapObservable(valueAccessor());
+
+ if (modelValue === null || modelValue === undefined) {
+ modelValue = '';
+ }
+
+ if (elementValueBeforeEvent !== undefined && modelValue === elementValueBeforeEvent) {
+ setTimeout(updateView, 4);
+ return;
+ }
+
+ // Update the element only if the element and model are different. On some browsers, updating the value
+ // will move the cursor to the end of the input, which would be bad while the user is typing.
+ if (element.value !== modelValue) {
+ previousElementValue = modelValue; // Make sure we ignore events (propertychange) that result from updating the value
+ element.value = modelValue;
+ }
+ };
+
+ var onEvent = function (event, handler) {
+ ko.utils.registerEventHandler(element, event, handler);
+ };
+
+ if (DEBUG && ko.bindingHandlers['textInput']['_forceUpdateOn']) {
+ // Provide a way for tests to specify exactly which events are bound
+ ko.utils.arrayForEach(ko.bindingHandlers['textInput']['_forceUpdateOn'], function(eventName) {
+ if (eventName.slice(0,5) == 'after') {
+ onEvent(eventName.slice(5), deferUpdateModel);
+ } else {
+ onEvent(eventName, updateModel);
+ }
+ });
+ } else {
+ if (ko.utils.ieVersion < 10) {
+ // Internet Explorer <= 8 doesn't support the 'input' event, but does include 'propertychange' that fires whenever
+ // any property of an element changes. Unlike 'input', it also fires if a property is changed from JavaScript code,
+ // but that's an acceptable compromise for this binding. IE 9 does support 'input', but since it doesn't fire it
+ // when using autocomplete, we'll use 'propertychange' for it also.
+ onEvent('propertychange', function(event) {
+ if (event.propertyName === 'value') {
+ updateModel(event);
+ }
+ });
+
+ if (ko.utils.ieVersion == 8) {
+ // IE 8 has a bug where it fails to fire 'propertychange' on the first update following a value change from
+ // JavaScript code. It also doesn't fire if you clear the entire value. To fix this, we bind to the following
+ // events too.
+ onEvent('keyup', updateModel); // A single keystoke
+ onEvent('keydown', updateModel); // The first character when a key is held down
+ }
+ if (ko.utils.ieVersion >= 8) {
+ // Internet Explorer 9 doesn't fire the 'input' event when deleting text, including using
+ // the backspace, delete, or ctrl-x keys, clicking the 'x' to clear the input, dragging text
+ // out of the field, and cutting or deleting text using the context menu. 'selectionchange'
+ // can detect all of those except dragging text out of the field, for which we use 'dragend'.
+ // These are also needed in IE8 because of the bug described above.
+ registerForSelectionChangeEvent(element, updateModel); // 'selectionchange' covers cut, paste, drop, delete, etc.
+ onEvent('dragend', deferUpdateModel);
+ }
+ } else {
+ // All other supported browsers support the 'input' event, which fires whenever the content of the element is changed
+ // through the user interface.
+ onEvent('input', updateModel);
+
+ if (safariVersion < 5 && ko.utils.tagNameLower(element) === "textarea") {
+ // Safari <5 doesn't fire the 'input' event for <textarea> elements (it does fire 'textInput'
+ // but only when typing). So we'll just catch as much as we can with keydown, cut, and paste.
+ onEvent('keydown', deferUpdateModel);
+ onEvent('paste', deferUpdateModel);
+ onEvent('cut', deferUpdateModel);
+ } else if (operaVersion < 11) {
+ // Opera 10 doesn't always fire the 'input' event for cut, paste, undo & drop operations.
+ // We can try to catch some of those using 'keydown'.
+ onEvent('keydown', deferUpdateModel);
+ } else if (firefoxVersion < 4.0) {
+ // Firefox <= 3.6 doesn't fire the 'input' event when text is filled in through autocomplete
+ onEvent('DOMAutoComplete', updateModel);
+
+ // Firefox <=3.5 doesn't fire the 'input' event when text is dropped into the input.
+ onEvent('dragdrop', updateModel); // <3.5
+ onEvent('drop', updateModel); // 3.5
+ }
+ }
+ }
+
+ // Bind to the change event so that we can catch programmatic updates of the value that fire this event.
+ onEvent('change', updateModel);
+
+ ko.computed(updateView, null, { disposeWhenNodeIsRemoved: element });
+ }
+};
+ko.expressionRewriting.twoWayBindings['textInput'] = true;
+
+// textinput is an alias for textInput
+ko.bindingHandlers['textinput'] = {
+ // preprocess is the only way to set up a full alias
+ 'preprocess': function (value, name, addBinding) {
+ addBinding('textInput', value);
+ }
+};
+
+})();ko.bindingHandlers['uniqueName'] = {
+ 'init': function (element, valueAccessor) {
+ if (valueAccessor()) {
+ var name = "ko_unique_" + (++ko.bindingHandlers['uniqueName'].currentIndex);
+ ko.utils.setElementName(element, name);
+ }
+ }
+};
+ko.bindingHandlers['uniqueName'].currentIndex = 0;
+ko.bindingHandlers['value'] = {
+ 'after': ['options', 'foreach'],
+ 'init': function (element, valueAccessor, allBindings) {
+ // If the value binding is placed on a radio/checkbox, then just pass through to checkedValue and quit
+ if (element.tagName.toLowerCase() == "input" && (element.type == "checkbox" || element.type == "radio")) {
+ ko.applyBindingAccessorsToNode(element, { 'checkedValue': valueAccessor });
+ return;
+ }
+
+ // Always catch "change" event; possibly other events too if asked
+ var eventsToCatch = ["change"];
+ var requestedEventsToCatch = allBindings.get("valueUpdate");
+ var propertyChangedFired = false;
+ var elementValueBeforeEvent = null;
+
+ if (requestedEventsToCatch) {
+ if (typeof requestedEventsToCatch == "string") // Allow both individual event names, and arrays of event names
+ requestedEventsToCatch = [requestedEventsToCatch];
+ ko.utils.arrayPushAll(eventsToCatch, requestedEventsToCatch);
+ eventsToCatch = ko.utils.arrayGetDistinctValues(eventsToCatch);
+ }
+
+ var valueUpdateHandler = function() {
+ elementValueBeforeEvent = null;
+ propertyChangedFired = false;
+ var modelValue = valueAccessor();
+ var elementValue = ko.selectExtensions.readValue(element);
+ ko.expressionRewriting.writeValueToProperty(modelValue, allBindings, 'value', elementValue);
+ }
+
+ // Workaround for https://github.com/SteveSanderson/knockout/issues/122
+ // IE doesn't fire "change" events on textboxes if the user selects a value from its autocomplete list
+ var ieAutoCompleteHackNeeded = ko.utils.ieVersion && element.tagName.toLowerCase() == "input" && element.type == "text"
+ && element.autocomplete != "off" && (!element.form || element.form.autocomplete != "off");
+ if (ieAutoCompleteHackNeeded && ko.utils.arrayIndexOf(eventsToCatch, "propertychange") == -1) {
+ ko.utils.registerEventHandler(element, "propertychange", function () { propertyChangedFired = true });
+ ko.utils.registerEventHandler(element, "focus", function () { propertyChangedFired = false });
+ ko.utils.registerEventHandler(element, "blur", function() {
+ if (propertyChangedFired) {
+ valueUpdateHandler();
+ }
+ });
+ }
+
+ ko.utils.arrayForEach(eventsToCatch, function(eventName) {
+ // The syntax "after<eventname>" means "run the handler asynchronously after the event"
+ // This is useful, for example, to catch "keydown" events after the browser has updated the control
+ // (otherwise, ko.selectExtensions.readValue(this) will receive the control's value *before* the key event)
+ var handler = valueUpdateHandler;
+ if (ko.utils.stringStartsWith(eventName, "after")) {
+ handler = function() {
+ // The elementValueBeforeEvent variable is non-null *only* during the brief gap between
+ // a keyX event firing and the valueUpdateHandler running, which is scheduled to happen
+ // at the earliest asynchronous opportunity. We store this temporary information so that
+ // if, between keyX and valueUpdateHandler, the underlying model value changes separately,
+ // we can overwrite that model value change with the value the user just typed. Otherwise,
+ // techniques like rateLimit can trigger model changes at critical moments that will
+ // override the user's inputs, causing keystrokes to be lost.
+ elementValueBeforeEvent = ko.selectExtensions.readValue(element);
+ setTimeout(valueUpdateHandler, 0);
+ };
+ eventName = eventName.substring("after".length);
+ }
+ ko.utils.registerEventHandler(element, eventName, handler);
+ });
+
+ var updateFromModel = function () {
+ var newValue = ko.utils.unwrapObservable(valueAccessor());
+ var elementValue = ko.selectExtensions.readValue(element);
+
+ if (elementValueBeforeEvent !== null && newValue === elementValueBeforeEvent) {
+ setTimeout(updateFromModel, 0);
+ return;
+ }
+
+ var valueHasChanged = (newValue !== elementValue);
+
+ if (valueHasChanged) {
+ if (ko.utils.tagNameLower(element) === "select") {
+ var allowUnset = allBindings.get('valueAllowUnset');
+ var applyValueAction = function () {
+ ko.selectExtensions.writeValue(element, newValue, allowUnset);
+ };
+ applyValueAction();
+
+ if (!allowUnset && newValue !== ko.selectExtensions.readValue(element)) {
+ // If you try to set a model value that can't be represented in an already-populated dropdown, reject that change,
+ // because you're not allowed to have a model value that disagrees with a visible UI selection.
+ ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, "change"]);
+ } else {
+ // Workaround for IE6 bug: It won't reliably apply values to SELECT nodes during the same execution thread
+ // right after you've changed the set of OPTION nodes on it. So for that node type, we'll schedule a second thread
+ // to apply the value as well.
+ setTimeout(applyValueAction, 0);
+ }
+ } else {
+ ko.selectExtensions.writeValue(element, newValue);
+ }
+ }
+ };
+
+ ko.computed(updateFromModel, null, { disposeWhenNodeIsRemoved: element });
+ },
+ 'update': function() {} // Keep for backwards compatibility with code that may have wrapped value binding
+};
+ko.expressionRewriting.twoWayBindings['value'] = true;
+ko.bindingHandlers['visible'] = {
+ 'update': function (element, valueAccessor) {
+ var value = ko.utils.unwrapObservable(valueAccessor());
+ var isCurrentlyVisible = !(element.style.display == "none");
+ if (value && !isCurrentlyVisible)
+ element.style.display = "";
+ else if ((!value) && isCurrentlyVisible)
+ element.style.display = "none";
+ }
+};
+// 'click' is just a shorthand for the usual full-length event:{click:handler}
+makeEventHandlerShortcut('click');
+// If you want to make a custom template engine,
+//
+// [1] Inherit from this class (like ko.nativeTemplateEngine does)
+// [2] Override 'renderTemplateSource', supplying a function with this signature:
+//
+// function (templateSource, bindingContext, options) {
+// // - templateSource.text() is the text of the template you should render
+// // - bindingContext.$data is the data you should pass into the template
+// // - you might also want to make bindingContext.$parent, bindingContext.$parents,
+// // and bindingContext.$root available in the template too
+// // - options gives you access to any other properties set on "data-bind: { template: options }"
+// // - templateDocument is the document object of the template
+// //
+// // Return value: an array of DOM nodes
+// }
+//
+// [3] Override 'createJavaScriptEvaluatorBlock', supplying a function with this signature:
+//
+// function (script) {
+// // Return value: Whatever syntax means "Evaluate the JavaScript statement 'script' and output the result"
+// // For example, the jquery.tmpl template engine converts 'someScript' to '${ someScript }'
+// }
+//
+// This is only necessary if you want to allow data-bind attributes to reference arbitrary template variables.
+// If you don't want to allow that, you can set the property 'allowTemplateRewriting' to false (like ko.nativeTemplateEngine does)
+// and then you don't need to override 'createJavaScriptEvaluatorBlock'.
+
+ko.templateEngine = function () { };
+
+ko.templateEngine.prototype['renderTemplateSource'] = function (templateSource, bindingContext, options, templateDocument) {
+ throw new Error("Override renderTemplateSource");
+};
+
+ko.templateEngine.prototype['createJavaScriptEvaluatorBlock'] = function (script) {
+ throw new Error("Override createJavaScriptEvaluatorBlock");
+};
+
+ko.templateEngine.prototype['makeTemplateSource'] = function(template, templateDocument) {
+ // Named template
+ if (typeof template == "string") {
+ templateDocument = templateDocument || document;
+ var elem = templateDocument.getElementById(template);
+ if (!elem)
+ throw new Error("Cannot find template with ID " + template);
+ return new ko.templateSources.domElement(elem);
+ } else if ((template.nodeType == 1) || (template.nodeType == 8)) {
+ // Anonymous template
+ return new ko.templateSources.anonymousTemplate(template);
+ } else
+ throw new Error("Unknown template type: " + template);
+};
+
+ko.templateEngine.prototype['renderTemplate'] = function (template, bindingContext, options, templateDocument) {
+ var templateSource = this['makeTemplateSource'](template, templateDocument);
+ return this['renderTemplateSource'](templateSource, bindingContext, options, templateDocument);
+};
+
+ko.templateEngine.prototype['isTemplateRewritten'] = function (template, templateDocument) {
+ // Skip rewriting if requested
+ if (this['allowTemplateRewriting'] === false)
+ return true;
+ return this['makeTemplateSource'](template, templateDocument)['data']("isRewritten");
+};
+
+ko.templateEngine.prototype['rewriteTemplate'] = function (template, rewriterCallback, templateDocument) {
+ var templateSource = this['makeTemplateSource'](template, templateDocument);
+ var rewritten = rewriterCallback(templateSource['text']());
+ templateSource['text'](rewritten);
+ templateSource['data']("isRewritten", true);
+};
+
+ko.exportSymbol('templateEngine', ko.templateEngine);
+
+ko.templateRewriting = (function () {
+ var memoizeDataBindingAttributeSyntaxRegex = /(<([a-z]+\d*)(?:\s+(?!data-bind\s*=\s*)[a-z0-9\-]+(?:=(?:\"[^\"]*\"|\'[^\']*\'|[^>]*))?)*\s+)data-bind\s*=\s*(["'])([\s\S]*?)\3/gi;
+ var memoizeVirtualContainerBindingSyntaxRegex = /<!--\s*ko\b\s*([\s\S]*?)\s*-->/g;
+
+ function validateDataBindValuesForRewriting(keyValueArray) {
+ var allValidators = ko.expressionRewriting.bindingRewriteValidators;
+ for (var i = 0; i < keyValueArray.length; i++) {
+ var key = keyValueArray[i]['key'];
+ if (allValidators.hasOwnProperty(key)) {
+ var validator = allValidators[key];
+
+ if (typeof validator === "function") {
+ var possibleErrorMessage = validator(keyValueArray[i]['value']);
+ if (possibleErrorMessage)
+ throw new Error(possibleErrorMessage);
+ } else if (!validator) {
+ throw new Error("This template engine does not support the '" + key + "' binding within its templates");
+ }
+ }
+ }
+ }
+
+ function constructMemoizedTagReplacement(dataBindAttributeValue, tagToRetain, nodeName, templateEngine) {
+ var dataBindKeyValueArray = ko.expressionRewriting.parseObjectLiteral(dataBindAttributeValue);
+ validateDataBindValuesForRewriting(dataBindKeyValueArray);
+ var rewrittenDataBindAttributeValue = ko.expressionRewriting.preProcessBindings(dataBindKeyValueArray, {'valueAccessors':true});
+
+ // For no obvious reason, Opera fails to evaluate rewrittenDataBindAttributeValue unless it's wrapped in an additional
+ // anonymous function, even though Opera's built-in debugger can evaluate it anyway. No other browser requires this
+ // extra indirection.
+ var applyBindingsToNextSiblingScript =
+ "ko.__tr_ambtns(function($context,$element){return(function(){return{ " + rewrittenDataBindAttributeValue + " } })()},'" + nodeName.toLowerCase() + "')";
+ return templateEngine['createJavaScriptEvaluatorBlock'](applyBindingsToNextSiblingScript) + tagToRetain;
+ }
+
+ return {
+ ensureTemplateIsRewritten: function (template, templateEngine, templateDocument) {
+ if (!templateEngine['isTemplateRewritten'](template, templateDocument))
+ templateEngine['rewriteTemplate'](template, function (htmlString) {
+ return ko.templateRewriting.memoizeBindingAttributeSyntax(htmlString, templateEngine);
+ }, templateDocument);
+ },
+
+ memoizeBindingAttributeSyntax: function (htmlString, templateEngine) {
+ return htmlString.replace(memoizeDataBindingAttributeSyntaxRegex, function () {
+ return constructMemoizedTagReplacement(/* dataBindAttributeValue: */ arguments[4], /* tagToRetain: */ arguments[1], /* nodeName: */ arguments[2], templateEngine);
+ }).replace(memoizeVirtualContainerBindingSyntaxRegex, function() {
+ return constructMemoizedTagReplacement(/* dataBindAttributeValue: */ arguments[1], /* tagToRetain: */ "<!-- ko -->", /* nodeName: */ "#comment", templateEngine);
+ });
+ },
+
+ applyMemoizedBindingsToNextSibling: function (bindings, nodeName) {
+ return ko.memoization.memoize(function (domNode, bindingContext) {
+ var nodeToBind = domNode.nextSibling;
+ if (nodeToBind && nodeToBind.nodeName.toLowerCase() === nodeName) {
+ ko.applyBindingAccessorsToNode(nodeToBind, bindings, bindingContext);
+ }
+ });
+ }
+ }
+})();
+
+
+// Exported only because it has to be referenced by string lookup from within rewritten template
+ko.exportSymbol('__tr_ambtns', ko.templateRewriting.applyMemoizedBindingsToNextSibling);
+(function() {
+ // A template source represents a read/write way of accessing a template. This is to eliminate the need for template loading/saving
+ // logic to be duplicated in every template engine (and means they can all work with anonymous templates, etc.)
+ //
+ // Two are provided by default:
+ // 1. ko.templateSources.domElement - reads/writes the text content of an arbitrary DOM element
+ // 2. ko.templateSources.anonymousElement - uses ko.utils.domData to read/write text *associated* with the DOM element, but
+ // without reading/writing the actual element text content, since it will be overwritten
+ // with the rendered template output.
+ // You can implement your own template source if you want to fetch/store templates somewhere other than in DOM elements.
+ // Template sources need to have the following functions:
+ // text() - returns the template text from your storage location
+ // text(value) - writes the supplied template text to your storage location
+ // data(key) - reads values stored using data(key, value) - see below
+ // data(key, value) - associates "value" with this template and the key "key". Is used to store information like "isRewritten".
+ //
+ // Optionally, template sources can also have the following functions:
+ // nodes() - returns a DOM element containing the nodes of this template, where available
+ // nodes(value) - writes the given DOM element to your storage location
+ // If a DOM element is available for a given template source, template engines are encouraged to use it in preference over text()
+ // for improved speed. However, all templateSources must supply text() even if they don't supply nodes().
+ //
+ // Once you've implemented a templateSource, make your template engine use it by subclassing whatever template engine you were
+ // using and overriding "makeTemplateSource" to return an instance of your custom template source.
+
+ ko.templateSources = {};
+
+ // ---- ko.templateSources.domElement -----
+
+ ko.templateSources.domElement = function(element) {
+ this.domElement = element;
+ }
+
+ ko.templateSources.domElement.prototype['text'] = function(/* valueToWrite */) {
+ var tagNameLower = ko.utils.tagNameLower(this.domElement),
+ elemContentsProperty = tagNameLower === "script" ? "text"
+ : tagNameLower === "textarea" ? "value"
+ : "innerHTML";
+
+ if (arguments.length == 0) {
+ return this.domElement[elemContentsProperty];
+ } else {
+ var valueToWrite = arguments[0];
+ if (elemContentsProperty === "innerHTML")
+ ko.utils.setHtml(this.domElement, valueToWrite);
+ else
+ this.domElement[elemContentsProperty] = valueToWrite;
+ }
+ };
+
+ var dataDomDataPrefix = ko.utils.domData.nextKey() + "_";
+ ko.templateSources.domElement.prototype['data'] = function(key /*, valueToWrite */) {
+ if (arguments.length === 1) {
+ return ko.utils.domData.get(this.domElement, dataDomDataPrefix + key);
+ } else {
+ ko.utils.domData.set(this.domElement, dataDomDataPrefix + key, arguments[1]);
+ }
+ };
+
+ // ---- ko.templateSources.anonymousTemplate -----
+ // Anonymous templates are normally saved/retrieved as DOM nodes through "nodes".
+ // For compatibility, you can also read "text"; it will be serialized from the nodes on demand.
+ // Writing to "text" is still supported, but then the template data will not be available as DOM nodes.
+
+ var anonymousTemplatesDomDataKey = ko.utils.domData.nextKey();
+ ko.templateSources.anonymousTemplate = function(element) {
+ this.domElement = element;
+ }
+ ko.templateSources.anonymousTemplate.prototype = new ko.templateSources.domElement();
+ ko.templateSources.anonymousTemplate.prototype.constructor = ko.templateSources.anonymousTemplate;
+ ko.templateSources.anonymousTemplate.prototype['text'] = function(/* valueToWrite */) {
+ if (arguments.length == 0) {
+ var templateData = ko.utils.domData.get(this.domElement, anonymousTemplatesDomDataKey) || {};
+ if (templateData.textData === undefined && templateData.containerData)
+ templateData.textData = templateData.containerData.innerHTML;
+ return templateData.textData;
+ } else {
+ var valueToWrite = arguments[0];
+ ko.utils.domData.set(this.domElement, anonymousTemplatesDomDataKey, {textData: valueToWrite});
+ }
+ };
+ ko.templateSources.domElement.prototype['nodes'] = function(/* valueToWrite */) {
+ if (arguments.length == 0) {
+ var templateData = ko.utils.domData.get(this.domElement, anonymousTemplatesDomDataKey) || {};
+ return templateData.containerData;
+ } else {
+ var valueToWrite = arguments[0];
+ ko.utils.domData.set(this.domElement, anonymousTemplatesDomDataKey, {containerData: valueToWrite});
+ }
+ };
+
+ ko.exportSymbol('templateSources', ko.templateSources);
+ ko.exportSymbol('templateSources.domElement', ko.templateSources.domElement);
+ ko.exportSymbol('templateSources.anonymousTemplate', ko.templateSources.anonymousTemplate);
+})();
+(function () {
+ var _templateEngine;
+ ko.setTemplateEngine = function (templateEngine) {
+ if ((templateEngine != undefined) && !(templateEngine instanceof ko.templateEngine))
+ throw new Error("templateEngine must inherit from ko.templateEngine");
+ _templateEngine = templateEngine;
+ }
+
+ function invokeForEachNodeInContinuousRange(firstNode, lastNode, action) {
+ var node, nextInQueue = firstNode, firstOutOfRangeNode = ko.virtualElements.nextSibling(lastNode);
+ while (nextInQueue && ((node = nextInQueue) !== firstOutOfRangeNode)) {
+ nextInQueue = ko.virtualElements.nextSibling(node);
+ action(node, nextInQueue);
+ }
+ }
+
+ function activateBindingsOnContinuousNodeArray(continuousNodeArray, bindingContext) {
+ // To be used on any nodes that have been rendered by a template and have been inserted into some parent element
+ // Walks through continuousNodeArray (which *must* be continuous, i.e., an uninterrupted sequence of sibling nodes, because
+ // the algorithm for walking them relies on this), and for each top-level item in the virtual-element sense,
+ // (1) Does a regular "applyBindings" to associate bindingContext with this node and to activate any non-memoized bindings
+ // (2) Unmemoizes any memos in the DOM subtree (e.g., to activate bindings that had been memoized during template rewriting)
+
+ if (continuousNodeArray.length) {
+ var firstNode = continuousNodeArray[0],
+ lastNode = continuousNodeArray[continuousNodeArray.length - 1],
+ parentNode = firstNode.parentNode,
+ provider = ko.bindingProvider['instance'],
+ preprocessNode = provider['preprocessNode'];
+
+ if (preprocessNode) {
+ invokeForEachNodeInContinuousRange(firstNode, lastNode, function(node, nextNodeInRange) {
+ var nodePreviousSibling = node.previousSibling;
+ var newNodes = preprocessNode.call(provider, node);
+ if (newNodes) {
+ if (node === firstNode)
+ firstNode = newNodes[0] || nextNodeInRange;
+ if (node === lastNode)
+ lastNode = newNodes[newNodes.length - 1] || nodePreviousSibling;
+ }
+ });
+
+ // Because preprocessNode can change the nodes, including the first and last nodes, update continuousNodeArray to match.
+ // We need the full set, including inner nodes, because the unmemoize step might remove the first node (and so the real
+ // first node needs to be in the array).
+ continuousNodeArray.length = 0;
+ if (!firstNode) { // preprocessNode might have removed all the nodes, in which case there's nothing left to do
+ return;
+ }
+ if (firstNode === lastNode) {
+ continuousNodeArray.push(firstNode);
+ } else {
+ continuousNodeArray.push(firstNode, lastNode);
+ ko.utils.fixUpContinuousNodeArray(continuousNodeArray, parentNode);
+ }
+ }
+
+ // Need to applyBindings *before* unmemoziation, because unmemoization might introduce extra nodes (that we don't want to re-bind)
+ // whereas a regular applyBindings won't introduce new memoized nodes
+ invokeForEachNodeInContinuousRange(firstNode, lastNode, function(node) {
+ if (node.nodeType === 1 || node.nodeType === 8)
+ ko.applyBindings(bindingContext, node);
+ });
+ invokeForEachNodeInContinuousRange(firstNode, lastNode, function(node) {
+ if (node.nodeType === 1 || node.nodeType === 8)
+ ko.memoization.unmemoizeDomNodeAndDescendants(node, [bindingContext]);
+ });
+
+ // Make sure any changes done by applyBindings or unmemoize are reflected in the array
+ ko.utils.fixUpContinuousNodeArray(continuousNodeArray, parentNode);
+ }
+ }
+
+ function getFirstNodeFromPossibleArray(nodeOrNodeArray) {
+ return nodeOrNodeArray.nodeType ? nodeOrNodeArray
+ : nodeOrNodeArray.length > 0 ? nodeOrNodeArray[0]
+ : null;
+ }
+
+ function executeTemplate(targetNodeOrNodeArray, renderMode, template, bindingContext, options) {
+ options = options || {};
+ var firstTargetNode = targetNodeOrNodeArray && getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
+ var templateDocument = (firstTargetNode || template || {}).ownerDocument;
+ var templateEngineToUse = (options['templateEngine'] || _templateEngine);
+ ko.templateRewriting.ensureTemplateIsRewritten(template, templateEngineToUse, templateDocument);
+ var renderedNodesArray = templateEngineToUse['renderTemplate'](template, bindingContext, options, templateDocument);
+
+ // Loosely check result is an array of DOM nodes
+ if ((typeof renderedNodesArray.length != "number") || (renderedNodesArray.length > 0 && typeof renderedNodesArray[0].nodeType != "number"))
+ throw new Error("Template engine must return an array of DOM nodes");
+
+ var haveAddedNodesToParent = false;
+ switch (renderMode) {
+ case "replaceChildren":
+ ko.virtualElements.setDomNodeChildren(targetNodeOrNodeArray, renderedNodesArray);
+ haveAddedNodesToParent = true;
+ break;
+ case "replaceNode":
+ ko.utils.replaceDomNodes(targetNodeOrNodeArray, renderedNodesArray);
+ haveAddedNodesToParent = true;
+ break;
+ case "ignoreTargetNode": break;
+ default:
+ throw new Error("Unknown renderMode: " + renderMode);
+ }
+
+ if (haveAddedNodesToParent) {
+ activateBindingsOnContinuousNodeArray(renderedNodesArray, bindingContext);
+ if (options['afterRender'])
+ ko.dependencyDetection.ignore(options['afterRender'], null, [renderedNodesArray, bindingContext['$data']]);
+ }
+
+ return renderedNodesArray;
+ }
+
+ function resolveTemplateName(template, data, context) {
+ // The template can be specified as:
+ if (ko.isObservable(template)) {
+ // 1. An observable, with string value
+ return template();
+ } else if (typeof template === 'function') {
+ // 2. A function of (data, context) returning a string
+ return template(data, context);
+ } else {
+ // 3. A string
+ return template;
+ }
+ }
+
+ ko.renderTemplate = function (template, dataOrBindingContext, options, targetNodeOrNodeArray, renderMode) {
+ options = options || {};
+ if ((options['templateEngine'] || _templateEngine) == undefined)
+ throw new Error("Set a template engine before calling renderTemplate");
+ renderMode = renderMode || "replaceChildren";
+
+ if (targetNodeOrNodeArray) {
+ var firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
+
+ var whenToDispose = function () { return (!firstTargetNode) || !ko.utils.domNodeIsAttachedToDocument(firstTargetNode); }; // Passive disposal (on next evaluation)
+ var activelyDisposeWhenNodeIsRemoved = (firstTargetNode && renderMode == "replaceNode") ? firstTargetNode.parentNode : firstTargetNode;
+
+ return ko.dependentObservable( // So the DOM is automatically updated when any dependency changes
+ function () {
+ // Ensure we've got a proper binding context to work with
+ var bindingContext = (dataOrBindingContext && (dataOrBindingContext instanceof ko.bindingContext))
+ ? dataOrBindingContext
+ : new ko.bindingContext(ko.utils.unwrapObservable(dataOrBindingContext));
+
+ var templateName = resolveTemplateName(template, bindingContext['$data'], bindingContext),
+ renderedNodesArray = executeTemplate(targetNodeOrNodeArray, renderMode, templateName, bindingContext, options);
+
+ if (renderMode == "replaceNode") {
+ targetNodeOrNodeArray = renderedNodesArray;
+ firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
+ }
+ },
+ null,
+ { disposeWhen: whenToDispose, disposeWhenNodeIsRemoved: activelyDisposeWhenNodeIsRemoved }
+ );
+ } else {
+ // We don't yet have a DOM node to evaluate, so use a memo and render the template later when there is a DOM node
+ return ko.memoization.memoize(function (domNode) {
+ ko.renderTemplate(template, dataOrBindingContext, options, domNode, "replaceNode");
+ });
+ }
+ };
+
+ ko.renderTemplateForEach = function (template, arrayOrObservableArray, options, targetNode, parentBindingContext) {
+ // Since setDomNodeChildrenFromArrayMapping always calls executeTemplateForArrayItem and then
+ // activateBindingsCallback for added items, we can store the binding context in the former to use in the latter.
+ var arrayItemContext;
+
+ // This will be called by setDomNodeChildrenFromArrayMapping to get the nodes to add to targetNode
+ var executeTemplateForArrayItem = function (arrayValue, index) {
+ // Support selecting template as a function of the data being rendered
+ arrayItemContext = parentBindingContext['createChildContext'](arrayValue, options['as'], function(context) {
+ context['$index'] = index;
+ });
+
+ var templateName = resolveTemplateName(template, arrayValue, arrayItemContext);
+ return executeTemplate(null, "ignoreTargetNode", templateName, arrayItemContext, options);
+ }
+
+ // This will be called whenever setDomNodeChildrenFromArrayMapping has added nodes to targetNode
+ var activateBindingsCallback = function(arrayValue, addedNodesArray, index) {
+ activateBindingsOnContinuousNodeArray(addedNodesArray, arrayItemContext);
+ if (options['afterRender'])
+ options['afterRender'](addedNodesArray, arrayValue);
+
+ // release the "cache" variable, so that it can be collected by
+ // the GC when its value isn't used from within the bindings anymore.
+ arrayItemContext = null;
+ };
+
+ return ko.dependentObservable(function () {
+ var unwrappedArray = ko.utils.unwrapObservable(arrayOrObservableArray) || [];
+ if (typeof unwrappedArray.length == "undefined") // Coerce single value into array
+ unwrappedArray = [unwrappedArray];
+
+ // Filter out any entries marked as destroyed
+ var filteredArray = ko.utils.arrayFilter(unwrappedArray, function(item) {
+ return options['includeDestroyed'] || item === undefined || item === null || !ko.utils.unwrapObservable(item['_destroy']);
+ });
+
+ // Call setDomNodeChildrenFromArrayMapping, ignoring any observables unwrapped within (most likely from a callback function).
+ // If the array items are observables, though, they will be unwrapped in executeTemplateForArrayItem and managed within setDomNodeChildrenFromArrayMapping.
+ ko.dependencyDetection.ignore(ko.utils.setDomNodeChildrenFromArrayMapping, null, [targetNode, filteredArray, executeTemplateForArrayItem, options, activateBindingsCallback]);
+
+ }, null, { disposeWhenNodeIsRemoved: targetNode });
+ };
+
+ var templateComputedDomDataKey = ko.utils.domData.nextKey();
+ function disposeOldComputedAndStoreNewOne(element, newComputed) {
+ var oldComputed = ko.utils.domData.get(element, templateComputedDomDataKey);
+ if (oldComputed && (typeof(oldComputed.dispose) == 'function'))
+ oldComputed.dispose();
+ ko.utils.domData.set(element, templateComputedDomDataKey, (newComputed && newComputed.isActive()) ? newComputed : undefined);
+ }
+
+ ko.bindingHandlers['template'] = {
+ 'init': function(element, valueAccessor) {
+ // Support anonymous templates
+ var bindingValue = ko.utils.unwrapObservable(valueAccessor());
+ if (typeof bindingValue == "string" || bindingValue['name']) {
+ // It's a named template - clear the element
+ ko.virtualElements.emptyNode(element);
+ } else if ('nodes' in bindingValue) {
+ // We've been given an array of DOM nodes. Save them as the template source.
+ // There is no known use case for the node array being an observable array (if the output
+ // varies, put that behavior *into* your template - that's what templates are for), and
+ // the implementation would be a mess, so assert that it's not observable.
+ var nodes = bindingValue['nodes'] || [];
+ if (ko.isObservable(nodes)) {
+ throw new Error('The "nodes" option must be a plain, non-observable array.');
+ }
+ var container = ko.utils.moveCleanedNodesToContainerElement(nodes); // This also removes the nodes from their current parent
+ new ko.templateSources.anonymousTemplate(element)['nodes'](container);
+ } else {
+ // It's an anonymous template - store the element contents, then clear the element
+ var templateNodes = ko.virtualElements.childNodes(element),
+ container = ko.utils.moveCleanedNodesToContainerElement(templateNodes); // This also removes the nodes from their current parent
+ new ko.templateSources.anonymousTemplate(element)['nodes'](container);
+ }
+ return { 'controlsDescendantBindings': true };
+ },
+ 'update': function (element, valueAccessor, allBindings, viewModel, bindingContext) {
+ var value = valueAccessor(),
+ dataValue,
+ options = ko.utils.unwrapObservable(value),
+ shouldDisplay = true,
+ templateComputed = null,
+ templateName;
+
+ if (typeof options == "string") {
+ templateName = value;
+ options = {};
+ } else {
+ templateName = options['name'];
+
+ // Support "if"/"ifnot" conditions
+ if ('if' in options)
+ shouldDisplay = ko.utils.unwrapObservable(options['if']);
+ if (shouldDisplay && 'ifnot' in options)
+ shouldDisplay = !ko.utils.unwrapObservable(options['ifnot']);
+
+ dataValue = ko.utils.unwrapObservable(options['data']);
+ }
+
+ if ('foreach' in options) {
+ // Render once for each data point (treating data set as empty if shouldDisplay==false)
+ var dataArray = (shouldDisplay && options['foreach']) || [];
+ templateComputed = ko.renderTemplateForEach(templateName || element, dataArray, options, element, bindingContext);
+ } else if (!shouldDisplay) {
+ ko.virtualElements.emptyNode(element);
+ } else {
+ // Render once for this single data point (or use the viewModel if no data was provided)
+ var innerBindingContext = ('data' in options) ?
+ bindingContext['createChildContext'](dataValue, options['as']) : // Given an explitit 'data' value, we create a child binding context for it
+ bindingContext; // Given no explicit 'data' value, we retain the same binding context
+ templateComputed = ko.renderTemplate(templateName || element, innerBindingContext, options, element);
+ }
+
+ // It only makes sense to have a single template computed per element (otherwise which one should have its output displayed?)
+ disposeOldComputedAndStoreNewOne(element, templateComputed);
+ }
+ };
+
+ // Anonymous templates can't be rewritten. Give a nice error message if you try to do it.
+ ko.expressionRewriting.bindingRewriteValidators['template'] = function(bindingValue) {
+ var parsedBindingValue = ko.expressionRewriting.parseObjectLiteral(bindingValue);
+
+ if ((parsedBindingValue.length == 1) && parsedBindingValue[0]['unknown'])
+ return null; // It looks like a string literal, not an object literal, so treat it as a named template (which is allowed for rewriting)
+
+ if (ko.expressionRewriting.keyValueArrayContainsKey(parsedBindingValue, "name"))
+ return null; // Named templates can be rewritten, so return "no error"
+ return "This template engine does not support anonymous templates nested within its templates";
+ };
+
+ ko.virtualElements.allowedBindings['template'] = true;
+})();
+
+ko.exportSymbol('setTemplateEngine', ko.setTemplateEngine);
+ko.exportSymbol('renderTemplate', ko.renderTemplate);
+// Go through the items that have been added and deleted and try to find matches between them.
+ko.utils.findMovesInArrayComparison = function (left, right, limitFailedCompares) {
+ if (left.length && right.length) {
+ var failedCompares, l, r, leftItem, rightItem;
+ for (failedCompares = l = 0; (!limitFailedCompares || failedCompares < limitFailedCompares) && (leftItem = left[l]); ++l) {
+ for (r = 0; rightItem = right[r]; ++r) {
+ if (leftItem['value'] === rightItem['value']) {
+ leftItem['moved'] = rightItem['index'];
+ rightItem['moved'] = leftItem['index'];
+ right.splice(r, 1); // This item is marked as moved; so remove it from right list
+ failedCompares = r = 0; // Reset failed compares count because we're checking for consecutive failures
+ break;
+ }
+ }
+ failedCompares += r;
+ }
+ }
+};
+
+ko.utils.compareArrays = (function () {
+ var statusNotInOld = 'added', statusNotInNew = 'deleted';
+
+ // Simple calculation based on Levenshtein distance.
+ function compareArrays(oldArray, newArray, options) {
+ // For backward compatibility, if the third arg is actually a bool, interpret
+ // it as the old parameter 'dontLimitMoves'. Newer code should use { dontLimitMoves: true }.
+ options = (typeof options === 'boolean') ? { 'dontLimitMoves': options } : (options || {});
+ oldArray = oldArray || [];
+ newArray = newArray || [];
+
+ if (oldArray.length <= newArray.length)
+ return compareSmallArrayToBigArray(oldArray, newArray, statusNotInOld, statusNotInNew, options);
+ else
+ return compareSmallArrayToBigArray(newArray, oldArray, statusNotInNew, statusNotInOld, options);
+ }
+
+ function compareSmallArrayToBigArray(smlArray, bigArray, statusNotInSml, statusNotInBig, options) {
+ var myMin = Math.min,
+ myMax = Math.max,
+ editDistanceMatrix = [],
+ smlIndex, smlIndexMax = smlArray.length,
+ bigIndex, bigIndexMax = bigArray.length,
+ compareRange = (bigIndexMax - smlIndexMax) || 1,
+ maxDistance = smlIndexMax + bigIndexMax + 1,
+ thisRow, lastRow,
+ bigIndexMaxForRow, bigIndexMinForRow;
+
+ for (smlIndex = 0; smlIndex <= smlIndexMax; smlIndex++) {
+ lastRow = thisRow;
+ editDistanceMatrix.push(thisRow = []);
+ bigIndexMaxForRow = myMin(bigIndexMax, smlIndex + compareRange);
+ bigIndexMinForRow = myMax(0, smlIndex - 1);
+ for (bigIndex = bigIndexMinForRow; bigIndex <= bigIndexMaxForRow; bigIndex++) {
+ if (!bigIndex)
+ thisRow[bigIndex] = smlIndex + 1;
+ else if (!smlIndex) // Top row - transform empty array into new array via additions
+ thisRow[bigIndex] = bigIndex + 1;
+ else if (smlArray[smlIndex - 1] === bigArray[bigIndex - 1])
+ thisRow[bigIndex] = lastRow[bigIndex - 1]; // copy value (no edit)
+ else {
+ var northDistance = lastRow[bigIndex] || maxDistance; // not in big (deletion)
+ var westDistance = thisRow[bigIndex - 1] || maxDistance; // not in small (addition)
+ thisRow[bigIndex] = myMin(northDistance, westDistance) + 1;
+ }
+ }
+ }
+
+ var editScript = [], meMinusOne, notInSml = [], notInBig = [];
+ for (smlIndex = smlIndexMax, bigIndex = bigIndexMax; smlIndex || bigIndex;) {
+ meMinusOne = editDistanceMatrix[smlIndex][bigIndex] - 1;
+ if (bigIndex && meMinusOne === editDistanceMatrix[smlIndex][bigIndex-1]) {
+ notInSml.push(editScript[editScript.length] = { // added
+ 'status': statusNotInSml,
+ 'value': bigArray[--bigIndex],
+ 'index': bigIndex });
+ } else if (smlIndex && meMinusOne === editDistanceMatrix[smlIndex - 1][bigIndex]) {
+ notInBig.push(editScript[editScript.length] = { // deleted
+ 'status': statusNotInBig,
+ 'value': smlArray[--smlIndex],
+ 'index': smlIndex });
+ } else {
+ --bigIndex;
+ --smlIndex;
+ if (!options['sparse']) {
+ editScript.push({
+ 'status': "retained",
+ 'value': bigArray[bigIndex] });
+ }
+ }
+ }
+
+ // Set a limit on the number of consecutive non-matching comparisons; having it a multiple of
+ // smlIndexMax keeps the time complexity of this algorithm linear.
+ ko.utils.findMovesInArrayComparison(notInSml, notInBig, smlIndexMax * 10);
+
+ return editScript.reverse();
+ }
+
+ return compareArrays;
+})();
+
+ko.exportSymbol('utils.compareArrays', ko.utils.compareArrays);
+(function () {
+ // Objective:
+ // * Given an input array, a container DOM node, and a function from array elements to arrays of DOM nodes,
+ // map the array elements to arrays of DOM nodes, concatenate together all these arrays, and use them to populate the container DOM node
+ // * Next time we're given the same combination of things (with the array possibly having mutated), update the container DOM node
+ // so that its children is again the concatenation of the mappings of the array elements, but don't re-map any array elements that we
+ // previously mapped - retain those nodes, and just insert/delete other ones
+
+ // "callbackAfterAddingNodes" will be invoked after any "mapping"-generated nodes are inserted into the container node
+ // You can use this, for example, to activate bindings on those nodes.
+
+ function mapNodeAndRefreshWhenChanged(containerNode, mapping, valueToMap, callbackAfterAddingNodes, index) {
+ // Map this array value inside a dependentObservable so we re-map when any dependency changes
+ var mappedNodes = [];
+ var dependentObservable = ko.dependentObservable(function() {
+ var newMappedNodes = mapping(valueToMap, index, ko.utils.fixUpContinuousNodeArray(mappedNodes, containerNode)) || [];
+
+ // On subsequent evaluations, just replace the previously-inserted DOM nodes
+ if (mappedNodes.length > 0) {
+ ko.utils.replaceDomNodes(mappedNodes, newMappedNodes);
+ if (callbackAfterAddingNodes)
+ ko.dependencyDetection.ignore(callbackAfterAddingNodes, null, [valueToMap, newMappedNodes, index]);
+ }
+
+ // Replace the contents of the mappedNodes array, thereby updating the record
+ // of which nodes would be deleted if valueToMap was itself later removed
+ mappedNodes.length = 0;
+ ko.utils.arrayPushAll(mappedNodes, newMappedNodes);
+ }, null, { disposeWhenNodeIsRemoved: containerNode, disposeWhen: function() { return !ko.utils.anyDomNodeIsAttachedToDocument(mappedNodes); } });
+ return { mappedNodes : mappedNodes, dependentObservable : (dependentObservable.isActive() ? dependentObservable : undefined) };
+ }
+
+ var lastMappingResultDomDataKey = ko.utils.domData.nextKey();
+
+ ko.utils.setDomNodeChildrenFromArrayMapping = function (domNode, array, mapping, options, callbackAfterAddingNodes) {
+ // Compare the provided array against the previous one
+ array = array || [];
+ options = options || {};
+ var isFirstExecution = ko.utils.domData.get(domNode, lastMappingResultDomDataKey) === undefined;
+ var lastMappingResult = ko.utils.domData.get(domNode, lastMappingResultDomDataKey) || [];
+ var lastArray = ko.utils.arrayMap(lastMappingResult, function (x) { return x.arrayEntry; });
+ var editScript = ko.utils.compareArrays(lastArray, array, options['dontLimitMoves']);
+
+ // Build the new mapping result
+ var newMappingResult = [];
+ var lastMappingResultIndex = 0;
+ var newMappingResultIndex = 0;
+
+ var nodesToDelete = [];
+ var itemsToProcess = [];
+ var itemsForBeforeRemoveCallbacks = [];
+ var itemsForMoveCallbacks = [];
+ var itemsForAfterAddCallbacks = [];
+ var mapData;
+
+ function itemMovedOrRetained(editScriptIndex, oldPosition) {
+ mapData = lastMappingResult[oldPosition];
+ if (newMappingResultIndex !== oldPosition)
+ itemsForMoveCallbacks[editScriptIndex] = mapData;
+ // Since updating the index might change the nodes, do so before calling fixUpContinuousNodeArray
+ mapData.indexObservable(newMappingResultIndex++);
+ ko.utils.fixUpContinuousNodeArray(mapData.mappedNodes, domNode);
+ newMappingResult.push(mapData);
+ itemsToProcess.push(mapData);
+ }
+
+ function callCallback(callback, items) {
+ if (callback) {
+ for (var i = 0, n = items.length; i < n; i++) {
+ if (items[i]) {
+ ko.utils.arrayForEach(items[i].mappedNodes, function(node) {
+ callback(node, i, items[i].arrayEntry);
+ });
+ }
+ }
+ }
+ }
+
+ for (var i = 0, editScriptItem, movedIndex; editScriptItem = editScript[i]; i++) {
+ movedIndex = editScriptItem['moved'];
+ switch (editScriptItem['status']) {
+ case "deleted":
+ if (movedIndex === undefined) {
+ mapData = lastMappingResult[lastMappingResultIndex];
+
+ // Stop tracking changes to the mapping for these nodes
+ if (mapData.dependentObservable)
+ mapData.dependentObservable.dispose();
+
+ // Queue these nodes for later removal
+ nodesToDelete.push.apply(nodesToDelete, ko.utils.fixUpContinuousNodeArray(mapData.mappedNodes, domNode));
+ if (options['beforeRemove']) {
+ itemsForBeforeRemoveCallbacks[i] = mapData;
+ itemsToProcess.push(mapData);
+ }
+ }
+ lastMappingResultIndex++;
+ break;
+
+ case "retained":
+ itemMovedOrRetained(i, lastMappingResultIndex++);
+ break;
+
+ case "added":
+ if (movedIndex !== undefined) {
+ itemMovedOrRetained(i, movedIndex);
+ } else {
+ mapData = { arrayEntry: editScriptItem['value'], indexObservable: ko.observable(newMappingResultIndex++) };
+ newMappingResult.push(mapData);
+ itemsToProcess.push(mapData);
+ if (!isFirstExecution)
+ itemsForAfterAddCallbacks[i] = mapData;
+ }
+ break;
+ }
+ }
+
+ // Call beforeMove first before any changes have been made to the DOM
+ callCallback(options['beforeMove'], itemsForMoveCallbacks);
+
+ // Next remove nodes for deleted items (or just clean if there's a beforeRemove callback)
+ ko.utils.arrayForEach(nodesToDelete, options['beforeRemove'] ? ko.cleanNode : ko.removeNode);
+
+ // Next add/reorder the remaining items (will include deleted items if there's a beforeRemove callback)
+ for (var i = 0, nextNode = ko.virtualElements.firstChild(domNode), lastNode, node; mapData = itemsToProcess[i]; i++) {
+ // Get nodes for newly added items
+ if (!mapData.mappedNodes)
+ ko.utils.extend(mapData, mapNodeAndRefreshWhenChanged(domNode, mapping, mapData.arrayEntry, callbackAfterAddingNodes, mapData.indexObservable));
+
+ // Put nodes in the right place if they aren't there already
+ for (var j = 0; node = mapData.mappedNodes[j]; nextNode = node.nextSibling, lastNode = node, j++) {
+ if (node !== nextNode)
+ ko.virtualElements.insertAfter(domNode, node, lastNode);
+ }
+
+ // Run the callbacks for newly added nodes (for example, to apply bindings, etc.)
+ if (!mapData.initialized && callbackAfterAddingNodes) {
+ callbackAfterAddingNodes(mapData.arrayEntry, mapData.mappedNodes, mapData.indexObservable);
+ mapData.initialized = true;
+ }
+ }
+
+ // If there's a beforeRemove callback, call it after reordering.
+ // Note that we assume that the beforeRemove callback will usually be used to remove the nodes using
+ // some sort of animation, which is why we first reorder the nodes that will be removed. If the
+ // callback instead removes the nodes right away, it would be more efficient to skip reordering them.
+ // Perhaps we'll make that change in the future if this scenario becomes more common.
+ callCallback(options['beforeRemove'], itemsForBeforeRemoveCallbacks);
+
+ // Finally call afterMove and afterAdd callbacks
+ callCallback(options['afterMove'], itemsForMoveCallbacks);
+ callCallback(options['afterAdd'], itemsForAfterAddCallbacks);
+
+ // Store a copy of the array items we just considered so we can difference it next time
+ ko.utils.domData.set(domNode, lastMappingResultDomDataKey, newMappingResult);
+ }
+})();
+
+ko.exportSymbol('utils.setDomNodeChildrenFromArrayMapping', ko.utils.setDomNodeChildrenFromArrayMapping);
+ko.nativeTemplateEngine = function () {
+ this['allowTemplateRewriting'] = false;
+}
+
+ko.nativeTemplateEngine.prototype = new ko.templateEngine();
+ko.nativeTemplateEngine.prototype.constructor = ko.nativeTemplateEngine;
+ko.nativeTemplateEngine.prototype['renderTemplateSource'] = function (templateSource, bindingContext, options, templateDocument) {
+ var useNodesIfAvailable = !(ko.utils.ieVersion < 9), // IE<9 cloneNode doesn't work properly
+ templateNodesFunc = useNodesIfAvailable ? templateSource['nodes'] : null,
+ templateNodes = templateNodesFunc ? templateSource['nodes']() : null;
+
+ if (templateNodes) {
+ return ko.utils.makeArray(templateNodes.cloneNode(true).childNodes);
+ } else {
+ var templateText = templateSource['text']();
+ return ko.utils.parseHtmlFragment(templateText, templateDocument);
+ }
+};
+
+ko.nativeTemplateEngine.instance = new ko.nativeTemplateEngine();
+ko.setTemplateEngine(ko.nativeTemplateEngine.instance);
+
+ko.exportSymbol('nativeTemplateEngine', ko.nativeTemplateEngine);
+(function() {
+ ko.jqueryTmplTemplateEngine = function () {
+ // Detect which version of jquery-tmpl you're using. Unfortunately jquery-tmpl
+ // doesn't expose a version number, so we have to infer it.
+ // Note that as of Knockout 1.3, we only support jQuery.tmpl 1.0.0pre and later,
+ // which KO internally refers to as version "2", so older versions are no longer detected.
+ var jQueryTmplVersion = this.jQueryTmplVersion = (function() {
+ if (!jQueryInstance || !(jQueryInstance['tmpl']))
+ return 0;
+ // Since it exposes no official version number, we use our own numbering system. To be updated as jquery-tmpl evolves.
+ try {
+ if (jQueryInstance['tmpl']['tag']['tmpl']['open'].toString().indexOf('__') >= 0) {
+ // Since 1.0.0pre, custom tags should append markup to an array called "__"
+ return 2; // Final version of jquery.tmpl
+ }
+ } catch(ex) { /* Apparently not the version we were looking for */ }
+
+ return 1; // Any older version that we don't support
+ })();
+
+ function ensureHasReferencedJQueryTemplates() {
+ if (jQueryTmplVersion < 2)
+ throw new Error("Your version of jQuery.tmpl is too old. Please upgrade to jQuery.tmpl 1.0.0pre or later.");
+ }
+
+ function executeTemplate(compiledTemplate, data, jQueryTemplateOptions) {
+ return jQueryInstance['tmpl'](compiledTemplate, data, jQueryTemplateOptions);
+ }
+
+ this['renderTemplateSource'] = function(templateSource, bindingContext, options, templateDocument) {
+ templateDocument = templateDocument || document;
+ options = options || {};
+ ensureHasReferencedJQueryTemplates();
+
+ // Ensure we have stored a precompiled version of this template (don't want to reparse on every render)
+ var precompiled = templateSource['data']('precompiled');
+ if (!precompiled) {
+ var templateText = templateSource['text']() || "";
+ // Wrap in "with($whatever.koBindingContext) { ... }"
+ templateText = "{{ko_with $item.koBindingContext}}" + templateText + "{{/ko_with}}";
+
+ precompiled = jQueryInstance['template'](null, templateText);
+ templateSource['data']('precompiled', precompiled);
+ }
+
+ var data = [bindingContext['$data']]; // Prewrap the data in an array to stop jquery.tmpl from trying to unwrap any arrays
+ var jQueryTemplateOptions = jQueryInstance['extend']({ 'koBindingContext': bindingContext }, options['templateOptions']);
+
+ var resultNodes = executeTemplate(precompiled, data, jQueryTemplateOptions);
+ resultNodes['appendTo'](templateDocument.createElement("div")); // Using "appendTo" forces jQuery/jQuery.tmpl to perform necessary cleanup work
+
+ jQueryInstance['fragments'] = {}; // Clear jQuery's fragment cache to avoid a memory leak after a large number of template renders
+ return resultNodes;
+ };
+
+ this['createJavaScriptEvaluatorBlock'] = function(script) {
+ return "{{ko_code ((function() { return " + script + " })()) }}";
+ };
+
+ this['addTemplate'] = function(templateName, templateMarkup) {
+ document.write("<script type='text/html' id='" + templateName + "'>" + templateMarkup + "<" + "/script>");
+ };
+
+ if (jQueryTmplVersion > 0) {
+ jQueryInstance['tmpl']['tag']['ko_code'] = {
+ open: "__.push($1 || '');"
+ };
+ jQueryInstance['tmpl']['tag']['ko_with'] = {
+ open: "with($1) {",
+ close: "} "
+ };
+ }
+ };
+
+ ko.jqueryTmplTemplateEngine.prototype = new ko.templateEngine();
+ ko.jqueryTmplTemplateEngine.prototype.constructor = ko.jqueryTmplTemplateEngine;
+
+ // Use this one by default *only if jquery.tmpl is referenced*
+ var jqueryTmplTemplateEngineInstance = new ko.jqueryTmplTemplateEngine();
+ if (jqueryTmplTemplateEngineInstance.jQueryTmplVersion > 0)
+ ko.setTemplateEngine(jqueryTmplTemplateEngineInstance);
+
+ ko.exportSymbol('jqueryTmplTemplateEngine', ko.jqueryTmplTemplateEngine);
+})();
+}));
+}());
+})();