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/**
* Unobtrusive scripting adapter for jQuery
*
* Requires jQuery 1.6.0 or later.
* https://github.com/rails/jquery-ujs
* Uploading file using rails.js
* =============================
*
* By default, browsers do not allow files to be uploaded via AJAX. As a result, if there are any non-blank file fields
* in the remote form, this adapter aborts the AJAX submission and allows the form to submit through standard means.
*
* The `ajax:aborted:file` event allows you to bind your own handler to process the form submission however you wish.
*
* Ex:
* $('form').live('ajax:aborted:file', function(event, elements){
* // Implement own remote file-transfer handler here for non-blank file inputs passed in `elements`.
* // Returning false in this handler tells rails.js to disallow standard form submission
* return false;
* });
*
* The `ajax:aborted:file` event is fired when a file-type input is detected with a non-blank value.
*
* Third-party tools can use this hook to detect when an AJAX file upload is attempted, and then use
* techniques like the iframe method to upload the file instead.
*
* Required fields in rails.js
* ===========================
*
* If any blank required inputs (required="required") are detected in the remote form, the whole form submission
* is canceled. Note that this is unlike file inputs, which still allow standard (non-AJAX) form submission.
*
* The `ajax:aborted:required` event allows you to bind your own handler to inform the user of blank required inputs.
*
* !! Note that Opera does not fire the form's submit event if there are blank required inputs, so this event may never
* get fired in Opera. This event is what causes other browsers to exhibit the same submit-aborting behavior.
*
* Ex:
* $('form').live('ajax:aborted:required', function(event, elements){
* // Returning false in this handler tells rails.js to submit the form anyway.
* // The blank required inputs are passed to this function in `elements`.
* return ! confirm("Would you like to submit the form with missing info?");
* });
*/
// Shorthand to make it a little easier to call public rails functions from within rails.js
var rails;
$.rails = rails = {
// Link elements bound by jquery-ujs
linkClickSelector: 'a[data-confirm], a[data-method], a[data-remote], a[data-disable-with]',
// Select elements bound by jquery-ujs
inputChangeSelector: 'select[data-remote], input[data-remote], textarea[data-remote]',
// Form elements bound by jquery-ujs
formSubmitSelector: 'form',
// Form input elements bound by jquery-ujs
formInputClickSelector: 'form input[type=submit], form input[type=image], form button[type=submit], form button:not(button[type])',
// Form input elements disabled during form submission
disableSelector: 'input[data-disable-with], button[data-disable-with], textarea[data-disable-with]',
// Form input elements re-enabled after form submission
enableSelector: 'input[data-disable-with]:disabled, button[data-disable-with]:disabled, textarea[data-disable-with]:disabled',
// Form required input elements
requiredInputSelector: 'input[name][required]:not([disabled]),textarea[name][required]:not([disabled])',
// Form file input elements
fileInputSelector: 'input:file',
// Link onClick disable selector with possible reenable after remote submission
linkDisableSelector: 'a[data-disable-with]',
// Make sure that every Ajax request sends the CSRF token
CSRFProtection: function(xhr) {
var token = $('meta[name="csrf-token"]').attr('content');
if (token) xhr.setRequestHeader('X-CSRF-Token', token);
},
// Triggers an event on an element and returns false if the event result is false
fire: function(obj, name, data) {
var event = $.Event(name);
obj.trigger(event, data);
return event.result !== false;
},
// Default confirm dialog, may be overridden with custom confirm dialog in $.rails.confirm
confirm: function(message) {
return confirm(message);
},
// Default ajax function, may be overridden with custom function in $.rails.ajax
ajax: function(options) {
return $.ajax(options);
},
// Submits "remote" forms and links with ajax
handleRemote: function(element) {
var method, url, data,
crossDomain = element.data('cross-domain') || null,
dataType = element.data('type') || ($.ajaxSettings && $.ajaxSettings.dataType),
options;
if (rails.fire(element, 'ajax:before')) {
if (element.is('form')) {
method = element.attr('method');
url = element.attr('action');
data = element.serializeArray();
// memoized value from clicked submit button
var button = element.data('ujs:submit-button');
if (button) {
data.push(button);
element.data('ujs:submit-button', null);
}
} else if (element.is(rails.inputChangeSelector)) {
method = element.data('method');
url = element.data('url');
data = element.serialize();
if (element.data('params')) data = data + "&" + element.data('params');
} else {
method = element.data('method');
url = element.attr('href');
data = element.data('params') || null;
}
options = {
type: method || 'GET', data: data, dataType: dataType, crossDomain: crossDomain,
// stopping the "ajax:beforeSend" event will cancel the ajax request
beforeSend: function(xhr, settings) {
if (settings.dataType === undefined) {
xhr.setRequestHeader('accept', '*/*;q=0.5, ' + settings.accepts.script);
}
return rails.fire(element, 'ajax:beforeSend', [xhr, settings]);
},
success: function(data, status, xhr) {
element.trigger('ajax:success', [data, status, xhr]);
},
complete: function(xhr, status) {
element.trigger('ajax:complete', [xhr, status]);
},
error: function(xhr, status, error) {
element.trigger('ajax:error', [xhr, status, error]);
}
};
// Only pass url to `ajax` options if not blank
if (url) { options.url = url; }
return rails.ajax(options);
} else {
return false;
}
},
// Handles "data-method" on links such as:
// Delete
handleMethod: function(link) {
var href = link.attr('href'),
method = link.data('method'),
target = link.attr('target'),
csrf_token = $('meta[name=csrf-token]').attr('content'),
csrf_param = $('meta[name=csrf-param]').attr('content'),
form = $(''),
metadata_input = '';
if (csrf_param !== undefined && csrf_token !== undefined) {
metadata_input += '';
}
if (target) { form.attr('target', target); }
form.hide().append(metadata_input).appendTo('body');
form.submit();
},
/* Disables form elements:
- Caches element value in 'ujs:enable-with' data store
- Replaces element text with value of 'data-disable-with' attribute
- Sets disabled property to true
*/
disableFormElements: function(form) {
form.find(rails.disableSelector).each(function() {
var element = $(this), method = element.is('button') ? 'html' : 'val';
element.data('ujs:enable-with', element[method]());
element[method](element.data('disable-with'));
element.prop('disabled', true);
});
},
/* Re-enables disabled form elements:
- Replaces element text with cached value from 'ujs:enable-with' data store (created in `disableFormElements`)
- Sets disabled property to false
*/
enableFormElements: function(form) {
form.find(rails.enableSelector).each(function() {
var element = $(this), method = element.is('button') ? 'html' : 'val';
if (element.data('ujs:enable-with')) element[method](element.data('ujs:enable-with'));
element.prop('disabled', false);
});
},
/* For 'data-confirm' attribute:
- Fires `confirm` event
- Shows the confirmation dialog
- Fires the `confirm:complete` event
Returns `true` if no function stops the chain and user chose yes; `false` otherwise.
Attaching a handler to the element's `confirm` event that returns a `falsy` value cancels the confirmation dialog.
Attaching a handler to the element's `confirm:complete` event that returns a `falsy` value makes this function
return false. The `confirm:complete` event is fired whether or not the user answered true or false to the dialog.
*/
allowAction: function(element) {
var message = element.data('confirm'),
answer = false, callback;
if (!message) { return true; }
if (rails.fire(element, 'confirm')) {
answer = rails.confirm(message);
callback = rails.fire(element, 'confirm:complete', [answer]);
}
return answer && callback;
},
// Helper function which checks for blank inputs in a form that match the specified CSS selector
blankInputs: function(form, specifiedSelector, nonBlank) {
var inputs = $(), input,
selector = specifiedSelector || 'input,textarea';
form.find(selector).each(function() {
input = $(this);
// Collect non-blank inputs if nonBlank option is true, otherwise, collect blank inputs
if (nonBlank ? input.val() : !input.val()) {
inputs = inputs.add(input);
}
});
return inputs.length ? inputs : false;
},
// Helper function which checks for non-blank inputs in a form that match the specified CSS selector
nonBlankInputs: function(form, specifiedSelector) {
return rails.blankInputs(form, specifiedSelector, true); // true specifies nonBlank
},
// Helper function, needed to provide consistent behavior in IE
stopEverything: function(e) {
$(e.target).trigger('ujs:everythingStopped');
e.stopImmediatePropagation();
return false;
},
// find all the submit events directly bound to the form and
// manually invoke them. If anyone returns false then stop the loop
callFormSubmitBindings: function(form, event) {
var events = form.data('events'), continuePropagation = true;
if (events !== undefined && events['submit'] !== undefined) {
$.each(events['submit'], function(i, obj){
if (typeof obj.handler === 'function') return continuePropagation = obj.handler(event);
});
}
return continuePropagation;
},
// replace element's html with the 'data-disable-with' after storing original html
// and prevent clicking on it
disableElement: function(element) {
element.data('ujs:enable-with', element.html()); // store enabled state
element.html(element.data('disable-with')); // set to disabled state
element.bind('click.railsDisable', function(e) { // prevent further clicking
return rails.stopEverything(e)
});
},
// restore element to its original state which was disabled by 'disableElement' above
enableElement: function(element) {
if (element.data('ujs:enable-with') !== undefined) {
element.html(element.data('ujs:enable-with')); // set to old enabled state
// this should be element.removeData('ujs:enable-with')
// but, there is currently a bug in jquery which makes hyphenated data attributes not get removed
element.data('ujs:enable-with', false); // clean up cache
}
element.unbind('click.railsDisable'); // enable element
}
};
$.ajaxPrefilter(function(options, originalOptions, xhr){ if ( !options.crossDomain ) { rails.CSRFProtection(xhr); }});
$(document).delegate(rails.linkDisableSelector, 'ajax:complete', function() {
rails.enableElement($(this));
});
$(document).delegate(rails.linkClickSelector, 'click.rails', function(e) {
var link = $(this), method = link.data('method'), data = link.data('params');
if (!rails.allowAction(link)) return rails.stopEverything(e);
if (link.is(rails.linkDisableSelector)) rails.disableElement(link);
if (link.data('remote') !== undefined) {
if ( (e.metaKey || e.ctrlKey) && (!method || method === 'GET') && !data ) { return true; }
if (rails.handleRemote(link) === false) { rails.enableElement(link); }
return false;
} else if (link.data('method')) {
rails.handleMethod(link);
return false;
}
});
$(document).delegate(rails.inputChangeSelector, 'change.rails', function(e) {
var link = $(this);
if (!rails.allowAction(link)) return rails.stopEverything(e);
rails.handleRemote(link);
return false;
});
$(document).delegate(rails.formSubmitSelector, 'submit.rails', function(e) {
var form = $(this),
remote = form.data('remote') !== undefined,
blankRequiredInputs = rails.blankInputs(form, rails.requiredInputSelector),
nonBlankFileInputs = rails.nonBlankInputs(form, rails.fileInputSelector);
if (!rails.allowAction(form)) return rails.stopEverything(e);
// skip other logic when required values are missing or file upload is present
if (blankRequiredInputs && form.attr("novalidate") == undefined && rails.fire(form, 'ajax:aborted:required', [blankRequiredInputs])) {
return rails.stopEverything(e);
}
if (remote) {
if (nonBlankFileInputs) {
return rails.fire(form, 'ajax:aborted:file', [nonBlankFileInputs]);
}
// If browser does not support submit bubbling, then this live-binding will be called before direct
// bindings. Therefore, we should directly call any direct bindings before remotely submitting form.
if (!$.support.submitBubbles && $().jquery < '1.7' && rails.callFormSubmitBindings(form, e) === false) return rails.stopEverything(e);
rails.handleRemote(form);
return false;
} else {
// slight timeout so that the submit button gets properly serialized
setTimeout(function(){ rails.disableFormElements(form); }, 13);
}
});
$(document).delegate(rails.formInputClickSelector, 'click.rails', function(event) {
var button = $(this);
if (!rails.allowAction(button)) return rails.stopEverything(event);
// register the pressed submit button
var name = button.attr('name'),
data = name ? {name:name, value:button.val()} : null;
button.closest('form').data('ujs:submit-button', data);
});
$(document).delegate(rails.formSubmitSelector, 'ajax:beforeSend.rails', function(event) {
if (this == event.target) rails.disableFormElements($(this));
});
$(document).delegate(rails.formSubmitSelector, 'ajax:complete.rails', function(event) {
if (this == event.target) rails.enableFormElements($(this));
});
})( jQuery );
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