//fgnass.github.com/spin.js#v1.3.2
/**
* Copyright (c) 2011-2013 Felix Gnass
* Licensed under the MIT license
*
Html per usare lo spinner
Parte js:
configurazioni
var spinner_opts = {
lines: 9, // The number of lines to draw
length: 17, // The length of each line
width: 8, // The line thickness
radius: 16, // The radius of the inner circle
corners: 1, // Corner roundness (0..1)
rotate: 0, // The rotation offset
direction: 1, // 1: clockwise, -1: counterclockwise
color: '#000', // #rgb or #rrggbb or array of colors
speed: 0.9, // Rounds per second
trail: 60, // Afterglow percentage
shadow: false, // Whether to render a shadow
hwaccel: false, // Whether to use hardware acceleration
className: 'spinner_spin', // The CSS class to assign to the spinner
zIndex: 2e9, // The z-index (defaults to 2000000000)
top: 'auto', // Top position relative to parent in px
left: 'auto' // Left position relative to parent in px
};
abilitare spinner:
var target = document.getElementById('id_dello_spinner');
var spinner = new Spinner(spinner_opts).spin(target); -> lo fa partire con le impostazioni
spinner.stop(); ->ferma lo spinner
*/
(function(root, factory) {
/* CommonJS */
if (typeof exports == 'object') module.exports = factory()
/* AMD module */
else if (typeof define == 'function' && define.amd) define(factory)
/* Browser global */
else root.Spinner = factory()
}
(this, function() {
"use strict";
var prefixes = ['webkit', 'Moz', 'ms', 'O'] /* Vendor prefixes */
, animations = {} /* Animation rules keyed by their name */
, useCssAnimations /* Whether to use CSS animations or setTimeout */
/**
* Utility function to create elements. If no tag name is given,
* a DIV is created. Optionally properties can be passed.
*/
function createEl(tag, prop) {
var el = document.createElement(tag || 'div')
, n
for(n in prop) el[n] = prop[n]
return el
}
/**
* Appends children and returns the parent.
*/
function ins(parent /* child1, child2, ...*/) {
for (var i=1, n=arguments.length; i> 1) : parseInt(o.left, 10) + mid) + 'px',
top: (o.top == 'auto' ? tp.y-ep.y + (target.offsetHeight >> 1) : parseInt(o.top, 10) + mid) + 'px'
})
}
el.setAttribute('role', 'progressbar')
self.lines(el, self.opts)
if (!useCssAnimations) {
// No CSS animation support, use setTimeout() instead
var i = 0
, start = (o.lines - 1) * (1 - o.direction) / 2
, alpha
, fps = o.fps
, f = fps/o.speed
, ostep = (1-o.opacity) / (f*o.trail / 100)
, astep = f/o.lines
;(function anim() {
i++;
for (var j = 0; j < o.lines; j++) {
alpha = Math.max(1 - (i + (o.lines - j) * astep) % f * ostep, o.opacity)
self.opacity(el, j * o.direction + start, alpha, o)
}
self.timeout = self.el && setTimeout(anim, ~~(1000/fps))
})()
}
return self
},
/**
* Stops and removes the Spinner.
*/
stop: function() {
var el = this.el
if (el) {
clearTimeout(this.timeout)
if (el.parentNode) el.parentNode.removeChild(el)
this.el = undefined
}
return this
},
/**
* Internal method that draws the individual lines. Will be overwritten
* in VML fallback mode below.
*/
lines: function(el, o) {
var i = 0
, start = (o.lines - 1) * (1 - o.direction) / 2
, seg
function fill(color, shadow) {
return css(createEl(), {
position: 'absolute',
width: (o.length+o.width) + 'px',
height: o.width + 'px',
background: color,
boxShadow: shadow,
transformOrigin: 'left',
transform: 'rotate(' + ~~(360/o.lines*i+o.rotate) + 'deg) translate(' + o.radius+'px' +',0)',
borderRadius: (o.corners * o.width>>1) + 'px'
})
}
for (; i < o.lines; i++) {
seg = css(createEl(), {
position: 'absolute',
top: 1+~(o.width/2) + 'px',
transform: o.hwaccel ? 'translate3d(0,0,0)' : '',
opacity: o.opacity,
animation: useCssAnimations && addAnimation(o.opacity, o.trail, start + i * o.direction, o.lines) + ' ' + 1/o.speed + 's linear infinite'
})
if (o.shadow) ins(seg, css(fill('#000', '0 0 4px ' + '#000'), {top: 2+'px'}))
ins(el, ins(seg, fill(getColor(o.color, i), '0 0 1px rgba(0,0,0,.1)')))
}
return el
},
/**
* Internal method that adjusts the opacity of a single line.
* Will be overwritten in VML fallback mode below.
*/
opacity: function(el, i, val) {
if (i < el.childNodes.length) el.childNodes[i].style.opacity = val
}
})
function initVML() {
/* Utility function to create a VML tag */
function vml(tag, attr) {
return createEl('<' + tag + ' xmlns="urn:schemas-microsoft.com:vml" class="spin-vml">', attr)
}
// No CSS transforms but VML support, add a CSS rule for VML elements:
sheet.addRule('.spin-vml', 'behavior:url(#default#VML)')
Spinner.prototype.lines = function(el, o) {
var r = o.length+o.width
, s = 2*r
function grp() {
return css(
vml('group', {
coordsize: s + ' ' + s,
coordorigin: -r + ' ' + -r
}),
{ width: s, height: s }
)
}
var margin = -(o.width+o.length)*2 + 'px'
, g = css(grp(), {position: 'absolute', top: margin, left: margin})
, i
function seg(i, dx, filter) {
ins(g,
ins(css(grp(), {rotation: 360 / o.lines * i + 'deg', left: ~~dx}),
ins(css(vml('roundrect', {arcsize: o.corners}), {
width: r,
height: o.width,
left: o.radius,
top: -o.width>>1,
filter: filter
}),
vml('fill', {color: getColor(o.color, i), opacity: o.opacity}),
vml('stroke', {opacity: 0}) // transparent stroke to fix color bleeding upon opacity change
)
)
)
}
if (o.shadow)
for (i = 1; i <= o.lines; i++)
seg(i, -2, 'progid:DXImageTransform.Microsoft.Blur(pixelradius=2,makeshadow=1,shadowopacity=.3)')
for (i = 1; i <= o.lines; i++) seg(i)
return ins(el, g)
}
Spinner.prototype.opacity = function(el, i, val, o) {
var c = el.firstChild
o = o.shadow && o.lines || 0
if (c && i+o < c.childNodes.length) {
c = c.childNodes[i+o]; c = c && c.firstChild; c = c && c.firstChild
if (c) c.opacity = val
}
}
}
var probe = css(createEl('group'), {behavior: 'url(#default#VML)'})
if (!vendor(probe, 'transform') && probe.adj) initVML()
else useCssAnimations = vendor(probe, 'animation')
return Spinner
}));