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+//fgnass.github.com/spin.js#v1.3
+
+/**
+ * Copyright (c) 2011-2013 Felix Gnass
+ * Licensed under the MIT license
+ */
+(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<n; i++)
+ parent.appendChild(arguments[i])
+
+ return parent
+ }
+
+ /**
+ * Insert a new stylesheet to hold the @keyframe or VML rules.
+ */
+ var sheet = (function() {
+ var el = createEl('style', {type : 'text/css'})
+ ins(document.getElementsByTagName('head')[0], el)
+ return el.sheet || el.styleSheet
+ }())
+
+ /**
+ * Creates an opacity keyframe animation rule and returns its name.
+ * Since most mobile Webkits have timing issues with animation-delay,
+ * we create separate rules for each line/segment.
+ */
+ function addAnimation(alpha, trail, i, lines) {
+ var name = ['opacity', trail, ~~(alpha*100), i, lines].join('-')
+ , start = 0.01 + i/lines * 100
+ , z = Math.max(1 - (1-alpha) / trail * (100-start), alpha)
+ , prefix = useCssAnimations.substring(0, useCssAnimations.indexOf('Animation')).toLowerCase()
+ , pre = prefix && '-' + prefix + '-' || ''
+
+ if (!animations[name]) {
+ sheet.insertRule(
+ '@' + pre + 'keyframes ' + name + '{' +
+ '0%{opacity:' + z + '}' +
+ start + '%{opacity:' + alpha + '}' +
+ (start+0.01) + '%{opacity:1}' +
+ (start+trail) % 100 + '%{opacity:' + alpha + '}' +
+ '100%{opacity:' + z + '}' +
+ '}', sheet.cssRules.length)
+
+ animations[name] = 1
+ }
+
+ return name
+ }
+
+ /**
+ * Tries various vendor prefixes and returns the first supported property.
+ */
+ function vendor(el, prop) {
+ var s = el.style
+ , pp
+ , i
+
+ if(s[prop] !== undefined) return prop
+ prop = prop.charAt(0).toUpperCase() + prop.slice(1)
+ for(i=0; i<prefixes.length; i++) {
+ pp = prefixes[i]+prop
+ if(s[pp] !== undefined) return pp
+ }
+ }
+
+ /**
+ * Sets multiple style properties at once.
+ */
+ function css(el, prop) {
+ for (var n in prop)
+ el.style[vendor(el, n)||n] = prop[n]
+
+ return el
+ }
+
+ /**
+ * Fills in default values.
+ */
+ function merge(obj) {
+ for (var i=1; i < arguments.length; i++) {
+ var def = arguments[i]
+ for (var n in def)
+ if (obj[n] === undefined) obj[n] = def[n]
+ }
+ return obj
+ }
+
+ /**
+ * Returns the absolute page-offset of the given element.
+ */
+ function pos(el) {
+ var o = { x:el.offsetLeft, y:el.offsetTop }
+ while((el = el.offsetParent))
+ o.x+=el.offsetLeft, o.y+=el.offsetTop
+
+ return o
+ }
+
+ // Built-in defaults
+
+ var defaults = {
+ lines: 12, // The number of lines to draw
+ length: 7, // The length of each line
+ width: 5, // The line thickness
+ radius: 10, // The radius of the inner circle
+ rotate: 0, // Rotation offset
+ corners: 1, // Roundness (0..1)
+ color: '#000', // #rgb or #rrggbb
+ direction: 1, // 1: clockwise, -1: counterclockwise
+ speed: 1, // Rounds per second
+ trail: 100, // Afterglow percentage
+ opacity: 1/4, // Opacity of the lines
+ fps: 20, // Frames per second when using setTimeout()
+ zIndex: 2e9, // Use a high z-index by default
+ className: 'spinner', // CSS class to assign to the element
+ top: 'auto', // center vertically
+ left: 'auto', // center horizontally
+ position: 'relative' // element position
+ }
+
+ /** The constructor */
+ function Spinner(o) {
+ if (typeof this == 'undefined') return new Spinner(o)
+ this.opts = merge(o || {}, Spinner.defaults, defaults)
+ }
+
+ // Global defaults that override the built-ins:
+ Spinner.defaults = {}
+
+ merge(Spinner.prototype, {
+
+ /**
+ * Adds the spinner to the given target element. If this instance is already
+ * spinning, it is automatically removed from its previous target b calling
+ * stop() internally.
+ */
+ spin: function(target) {
+ this.stop()
+
+ var self = this
+ , o = self.opts
+ , el = self.el = css(createEl(0, {className: o.className}), {position: o.position, width: 0, zIndex: o.zIndex})
+ , mid = o.radius+o.length+o.width
+ , ep // element position
+ , tp // target position
+
+ if (target) {
+ target.insertBefore(el, target.firstChild||null)
+ tp = pos(target)
+ ep = pos(el)
+ css(el, {
+ left: (o.left == 'auto' ? tp.x-ep.x + (target.offsetWidth >> 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(o.color, '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: o.color, 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
+
+}));