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+//fgnass.github.com/spin.js#v1.2.7
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+!function(window, document, undefined) {
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+
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+ /**
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+ * Copyright (c) 2011 Felix Gnass [fgnass at neteye dot de]
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+ * Licensed under the MIT license
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+ */
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+
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+ var prefixes = ['webkit', 'Moz', 'ms', 'O'] /* Vendor prefixes */
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+ , animations = {} /* Animation rules keyed by their name */
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+ , useCssAnimations
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+
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+ /**
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+ * Utility function to create elements. If no tag name is given,
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+ * a DIV is created. Optionally properties can be passed.
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+ */
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+ function createEl(tag, prop) {
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+ var el = document.createElement(tag || 'div')
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+ , n
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+
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+ for(n in prop) el[n] = prop[n]
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+ return el
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+ }
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+
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+ /**
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+ * Appends children and returns the parent.
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+ */
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+ function ins(parent /* child1, child2, ...*/) {
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+ for (var i=1, n=arguments.length; i<n; i++)
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+ parent.appendChild(arguments[i])
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+
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+ return parent
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+ }
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+
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+ /**
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+ * Insert a new stylesheet to hold the @keyframe or VML rules.
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+ */
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+ var sheet = function() {
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+ var el = createEl('style', {type : 'text/css'})
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+ ins(document.getElementsByTagName('head')[0], el)
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+ return el.sheet || el.styleSheet
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+ }()
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+
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+ /**
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+ * Creates an opacity keyframe animation rule and returns its name.
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+ * Since most mobile Webkits have timing issues with animation-delay,
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+ * we create separate rules for each line/segment.
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+ */
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+ function addAnimation(alpha, trail, i, lines) {
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+ var name = ['opacity', trail, ~~(alpha*100), i, lines].join('-')
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+ , start = 0.01 + i/lines*100
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+ , z = Math.max(1 - (1-alpha) / trail * (100-start), alpha)
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+ , prefix = useCssAnimations.substring(0, useCssAnimations.indexOf('Animation')).toLowerCase()
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+ , pre = prefix && '-'+prefix+'-' || ''
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+
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+ if (!animations[name]) {
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+ sheet.insertRule(
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+ '@' + pre + 'keyframes ' + name + '{' +
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+ '0%{opacity:' + z + '}' +
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+ start + '%{opacity:' + alpha + '}' +
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+ (start+0.01) + '%{opacity:1}' +
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+ (start+trail) % 100 + '%{opacity:' + alpha + '}' +
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+ '100%{opacity:' + z + '}' +
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+ '}', sheet.cssRules.length)
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+
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+ animations[name] = 1
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+ }
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+ return name
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+ }
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+
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+ /**
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+ * Tries various vendor prefixes and returns the first supported property.
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+ **/
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+ function vendor(el, prop) {
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+ var s = el.style
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+ , pp
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+ , i
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+
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+ if(s[prop] !== undefined) return prop
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+ prop = prop.charAt(0).toUpperCase() + prop.slice(1)
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+ for(i=0; i<prefixes.length; i++) {
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+ pp = prefixes[i]+prop
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+ if(s[pp] !== undefined) return pp
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+ }
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+ }
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+
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+ /**
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+ * Sets multiple style properties at once.
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+ */
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+ function css(el, prop) {
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+ for (var n in prop)
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+ el.style[vendor(el, n)||n] = prop[n]
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+
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+ return el
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+ }
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+
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+ /**
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+ * Fills in default values.
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+ */
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+ function merge(obj) {
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+ for (var i=1; i < arguments.length; i++) {
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+ var def = arguments[i]
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+ for (var n in def)
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+ if (obj[n] === undefined) obj[n] = def[n]
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+ }
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+ return obj
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+ }
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+
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+ /**
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+ * Returns the absolute page-offset of the given element.
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+ */
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+ function pos(el) {
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+ var o = { x:el.offsetLeft, y:el.offsetTop }
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+ while((el = el.offsetParent))
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+ o.x+=el.offsetLeft, o.y+=el.offsetTop
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+
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+ return o
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+ }
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+
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+ var defaults = {
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+ lines: 12, // The number of lines to draw
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+ length: 7, // The length of each line
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+ width: 5, // The line thickness
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+ radius: 10, // The radius of the inner circle
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+ rotate: 0, // Rotation offset
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+ corners: 1, // Roundness (0..1)
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+ color: '#000', // #rgb or #rrggbb
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+ speed: 1, // Rounds per second
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+ trail: 100, // Afterglow percentage
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+ opacity: 1/4, // Opacity of the lines
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+ fps: 20, // Frames per second when using setTimeout()
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+ zIndex: 2e9, // Use a high z-index by default
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+ className: 'spinner', // CSS class to assign to the element
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+ top: 'auto', // center vertically
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+ left: 'auto', // center horizontally
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+ position: 'relative' // element position
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+ }
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+
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+ /** The constructor */
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+ var Spinner = function Spinner(o) {
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+ if (!this.spin) return new Spinner(o)
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+ this.opts = merge(o || {}, Spinner.defaults, defaults)
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+ }
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+
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+ Spinner.defaults = {}
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+
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+ merge(Spinner.prototype, {
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+ spin: function(target) {
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+ this.stop()
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+ var self = this
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+ , o = self.opts
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+ , el = self.el = css(createEl(0, {className: o.className}), {position: o.position, width: 0, zIndex: o.zIndex})
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+ , mid = o.radius+o.length+o.width
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+ , ep // element position
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+ , tp // target position
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+
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+ if (target) {
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+ target.insertBefore(el, target.firstChild||null)
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+ tp = pos(target)
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+ ep = pos(el)
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+ css(el, {
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+ left: (o.left == 'auto' ? tp.x-ep.x + (target.offsetWidth >> 1) : parseInt(o.left, 10) + mid) + 'px',
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+ top: (o.top == 'auto' ? tp.y-ep.y + (target.offsetHeight >> 1) : parseInt(o.top, 10) + mid) + 'px'
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+ })
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+ }
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+
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+ el.setAttribute('aria-role', 'progressbar')
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+ self.lines(el, self.opts)
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+
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+ if (!useCssAnimations) {
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+ // No CSS animation support, use setTimeout() instead
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+ var i = 0
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+ , fps = o.fps
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+ , f = fps/o.speed
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+ , ostep = (1-o.opacity) / (f*o.trail / 100)
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+ , astep = f/o.lines
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+
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+ ;(function anim() {
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+ i++;
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+ for (var s=o.lines; s; s--) {
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+ var alpha = Math.max(1-(i+s*astep)%f * ostep, o.opacity)
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+ self.opacity(el, o.lines-s, alpha, o)
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+ }
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+ self.timeout = self.el && setTimeout(anim, ~~(1000/fps))
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+ })()
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+ }
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+ return self
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+ },
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+
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+ stop: function() {
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+ var el = this.el
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+ if (el) {
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+ clearTimeout(this.timeout)
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+ if (el.parentNode) el.parentNode.removeChild(el)
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+ this.el = undefined
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+ }
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+ return this
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+ },
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+
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+ lines: function(el, o) {
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+ var i = 0
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+ , seg
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+
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+ function fill(color, shadow) {
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+ return css(createEl(), {
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+ position: 'absolute',
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+ width: (o.length+o.width) + 'px',
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+ height: o.width + 'px',
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+ background: color,
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+ boxShadow: shadow,
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+ transformOrigin: 'left',
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+ transform: 'rotate(' + ~~(360/o.lines*i+o.rotate) + 'deg) translate(' + o.radius+'px' +',0)',
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+ borderRadius: (o.corners * o.width>>1) + 'px'
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+ })
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+ }
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+
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+ for (; i < o.lines; i++) {
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+ seg = css(createEl(), {
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+ position: 'absolute',
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+ top: 1+~(o.width/2) + 'px',
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+ transform: o.hwaccel ? 'translate3d(0,0,0)' : '',
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+ opacity: o.opacity,
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+ animation: useCssAnimations && addAnimation(o.opacity, o.trail, i, o.lines) + ' ' + 1/o.speed + 's linear infinite'
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+ })
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+
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+ if (o.shadow) ins(seg, css(fill('#000', '0 0 4px ' + '#000'), {top: 2+'px'}))
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+
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+ ins(el, ins(seg, fill(o.color, '0 0 1px rgba(0,0,0,.1)')))
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+ }
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+ return el
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+ },
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+
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+ opacity: function(el, i, val) {
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+ if (i < el.childNodes.length) el.childNodes[i].style.opacity = val
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+ }
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+
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+ })
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+
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+ /////////////////////////////////////////////////////////////////////////
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+ // VML rendering for IE
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+ /////////////////////////////////////////////////////////////////////////
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+
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+ /**
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+ * Check and init VML support
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+ */
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+ ;(function() {
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+
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+ function vml(tag, attr) {
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+ return createEl('<' + tag + ' xmlns="urn:schemas-microsoft.com:vml" class="spin-vml">', attr)
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+ }
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+
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+ var s = css(createEl('group'), {behavior: 'url(#default#VML)'})
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+
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+ if (!vendor(s, 'transform') && s.adj) {
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+
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+ // VML support detected. Insert CSS rule ...
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+ sheet.addRule('.spin-vml', 'behavior:url(#default#VML)')
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+
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+ Spinner.prototype.lines = function(el, o) {
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+ var r = o.length+o.width
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+ , s = 2*r
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+
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+ function grp() {
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+ return css(
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+ vml('group', {
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+ coordsize: s + ' ' + s,
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+ coordorigin: -r + ' ' + -r
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+ }),
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+ { width: s, height: s }
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+ )
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+ }
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+
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+ var margin = -(o.width+o.length)*2 + 'px'
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+ , g = css(grp(), {position: 'absolute', top: margin, left: margin})
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+ , i
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+
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+ function seg(i, dx, filter) {
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+ ins(g,
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+ ins(css(grp(), {rotation: 360 / o.lines * i + 'deg', left: ~~dx}),
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+ ins(css(vml('roundrect', {arcsize: o.corners}), {
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+ width: r,
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+ height: o.width,
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+ left: o.radius,
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+ top: -o.width>>1,
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+ filter: filter
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+ }),
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+ vml('fill', {color: o.color, opacity: o.opacity}),
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+ vml('stroke', {opacity: 0}) // transparent stroke to fix color bleeding upon opacity change
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+ )
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+ )
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+ )
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+ }
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+
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+ if (o.shadow)
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+ for (i = 1; i <= o.lines; i++)
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+ seg(i, -2, 'progid:DXImageTransform.Microsoft.Blur(pixelradius=2,makeshadow=1,shadowopacity=.3)')
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+
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+ for (i = 1; i <= o.lines; i++) seg(i)
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+ return ins(el, g)
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+ }
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+
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+ Spinner.prototype.opacity = function(el, i, val, o) {
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+ var c = el.firstChild
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+ o = o.shadow && o.lines || 0
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+ if (c && i+o < c.childNodes.length) {
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+ c = c.childNodes[i+o]; c = c && c.firstChild; c = c && c.firstChild
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+ if (c) c.opacity = val
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+ }
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+ }
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+ }
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+ else
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+ useCssAnimations = vendor(s, 'animation')
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+ })()
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+
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+ if (typeof define == 'function' && define.amd)
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+ define(function() { return Spinner })
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+ else
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+ window.Spinner = Spinner
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+
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+}(window, document);
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Yusaku Sako