//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 }));