1 //fgnass.github.com/spin.js#v1.2.8
2 !function(window, document, undefined) {
5 * Copyright (c) 2011 Felix Gnass [fgnass at neteye dot de]
6 * Licensed under the MIT license
9 var prefixes = ['webkit', 'Moz', 'ms', 'O'] /* Vendor prefixes */
10 , animations = {} /* Animation rules keyed by their name */
14 * Utility function to create elements. If no tag name is given,
15 * a DIV is created. Optionally properties can be passed.
17 function createEl(tag, prop) {
18 var el = document.createElement(tag || 'div')
21 for(n in prop) el[n] = prop[n]
26 * Appends children and returns the parent.
28 function ins(parent /* child1, child2, ...*/) {
29 for (var i=1, n=arguments.length; i<n; i++)
30 parent.appendChild(arguments[i])
36 * Insert a new stylesheet to hold the @keyframe or VML rules.
38 var sheet = function() {
39 var el = createEl('style', {type : 'text/css'})
40 ins(document.getElementsByTagName('head')[0], el)
41 return el.sheet || el.styleSheet
45 * Creates an opacity keyframe animation rule and returns its name.
46 * Since most mobile Webkits have timing issues with animation-delay,
47 * we create separate rules for each line/segment.
49 function addAnimation(alpha, trail, i, lines) {
50 var name = ['opacity', trail, ~~(alpha*100), i, lines].join('-')
51 , start = 0.01 + i/lines*100
52 , z = Math.max(1 - (1-alpha) / trail * (100-start), alpha)
53 , prefix = useCssAnimations.substring(0, useCssAnimations.indexOf('Animation')).toLowerCase()
54 , pre = prefix && '-'+prefix+'-' || ''
56 if (!animations[name]) {
58 '@' + pre + 'keyframes ' + name + '{' +
59 '0%{opacity:' + z + '}' +
60 start + '%{opacity:' + alpha + '}' +
61 (start+0.01) + '%{opacity:1}' +
62 (start+trail) % 100 + '%{opacity:' + alpha + '}' +
63 '100%{opacity:' + z + '}' +
64 '}', sheet.cssRules.length)
72 * Tries various vendor prefixes and returns the first supported property.
74 function vendor(el, prop) {
79 if(s[prop] !== undefined) return prop
80 prop = prop.charAt(0).toUpperCase() + prop.slice(1)
81 for(i=0; i<prefixes.length; i++) {
83 if(s[pp] !== undefined) return pp
88 * Sets multiple style properties at once.
90 function css(el, prop) {
92 el.style[vendor(el, n)||n] = prop[n]
98 * Fills in default values.
100 function merge(obj) {
101 for (var i=1; i < arguments.length; i++) {
102 var def = arguments[i]
104 if (obj[n] === undefined) obj[n] = def[n]
110 * Returns the absolute page-offset of the given element.
113 var o = { x:el.offsetLeft, y:el.offsetTop }
114 while((el = el.offsetParent))
115 o.x+=el.offsetLeft, o.y+=el.offsetTop
121 lines: 12, // The number of lines to draw
122 length: 7, // The length of each line
123 width: 5, // The line thickness
124 radius: 10, // The radius of the inner circle
125 rotate: 0, // Rotation offset
126 corners: 1, // Roundness (0..1)
127 color: '#000', // #rgb or #rrggbb
128 speed: 1, // Rounds per second
129 trail: 100, // Afterglow percentage
130 opacity: 1/4, // Opacity of the lines
131 fps: 20, // Frames per second when using setTimeout()
132 zIndex: 2e9, // Use a high z-index by default
133 className: 'spinner', // CSS class to assign to the element
134 top: 'auto', // center vertically
135 left: 'auto', // center horizontally
136 position: 'relative' // element position
139 /** The constructor */
140 function Spinner(o) {
141 if (!this.spin) return new Spinner(o)
142 this.opts = merge(o || {}, Spinner.defaults, defaults)
145 Spinner.defaults = {}
147 merge(Spinner.prototype, {
148 spin: function(target) {
152 , el = self.el = css(createEl(0, {className: o.className}), {position: o.position, width: 0, zIndex: o.zIndex})
153 , mid = o.radius+o.length+o.width
154 , ep // element position
155 , tp // target position
158 target.insertBefore(el, target.firstChild||null)
162 left: (o.left == 'auto' ? tp.x-ep.x + (target.offsetWidth >> 1) : parseInt(o.left, 10) + mid) + 'px',
163 top: (o.top == 'auto' ? tp.y-ep.y + (target.offsetHeight >> 1) : parseInt(o.top, 10) + mid) + 'px'
167 el.setAttribute('aria-role', 'progressbar')
168 self.lines(el, self.opts)
170 if (!useCssAnimations) {
171 // No CSS animation support, use setTimeout() instead
175 , ostep = (1-o.opacity) / (f*o.trail / 100)
180 for (var s=o.lines; s; s--) {
181 var alpha = Math.max(1-(i+s*astep)%f * ostep, o.opacity)
182 self.opacity(el, o.lines-s, alpha, o)
184 self.timeout = self.el && setTimeout(anim, ~~(1000/fps))
193 clearTimeout(this.timeout)
194 if (el.parentNode) el.parentNode.removeChild(el)
200 lines: function(el, o) {
204 function fill(color, shadow) {
205 return css(createEl(), {
206 position: 'absolute',
207 width: (o.length+o.width) + 'px',
208 height: o.width + 'px',
211 transformOrigin: 'left',
212 transform: 'rotate(' + ~~(360/o.lines*i+o.rotate) + 'deg) translate(' + o.radius+'px' +',0)',
213 borderRadius: (o.corners * o.width>>1) + 'px'
217 for (; i < o.lines; i++) {
218 seg = css(createEl(), {
219 position: 'absolute',
220 top: 1+~(o.width/2) + 'px',
221 transform: o.hwaccel ? 'translate3d(0,0,0)' : '',
223 animation: useCssAnimations && addAnimation(o.opacity, o.trail, i, o.lines) + ' ' + 1/o.speed + 's linear infinite'
226 if (o.shadow) ins(seg, css(fill('#000', '0 0 4px ' + '#000'), {top: 2+'px'}))
228 ins(el, ins(seg, fill(o.color, '0 0 1px rgba(0,0,0,.1)')))
233 opacity: function(el, i, val) {
234 if (i < el.childNodes.length) el.childNodes[i].style.opacity = val
239 /////////////////////////////////////////////////////////////////////////
240 // VML rendering for IE
241 /////////////////////////////////////////////////////////////////////////
244 * Check and init VML support
248 function vml(tag, attr) {
249 return createEl('<' + tag + ' xmlns="urn:schemas-microsoft.com:vml" class="spin-vml">', attr)
252 var s = css(createEl('group'), {behavior: 'url(#default#VML)'})
254 if (!vendor(s, 'transform') && s.adj) {
256 // VML support detected. Insert CSS rule ...
257 sheet.addRule('.spin-vml', 'behavior:url(#default#VML)')
259 Spinner.prototype.lines = function(el, o) {
260 var r = o.length+o.width
266 coordsize: s + ' ' + s,
267 coordorigin: -r + ' ' + -r
269 { width: s, height: s }
273 var margin = -(o.width+o.length)*2 + 'px'
274 , g = css(grp(), {position: 'absolute', top: margin, left: margin})
277 function seg(i, dx, filter) {
279 ins(css(grp(), {rotation: 360 / o.lines * i + 'deg', left: ~~dx}),
280 ins(css(vml('roundrect', {arcsize: o.corners}), {
287 vml('fill', {color: o.color, opacity: o.opacity}),
288 vml('stroke', {opacity: 0}) // transparent stroke to fix color bleeding upon opacity change
295 for (i = 1; i <= o.lines; i++)
296 seg(i, -2, 'progid:DXImageTransform.Microsoft.Blur(pixelradius=2,makeshadow=1,shadowopacity=.3)')
298 for (i = 1; i <= o.lines; i++) seg(i)
302 Spinner.prototype.opacity = function(el, i, val, o) {
303 var c = el.firstChild
304 o = o.shadow && o.lines || 0
305 if (c && i+o < c.childNodes.length) {
306 c = c.childNodes[i+o]; c = c && c.firstChild; c = c && c.firstChild
307 if (c) c.opacity = val
312 useCssAnimations = vendor(s, 'animation')
315 if (typeof define == 'function' && define.amd)
316 define(function() { return Spinner })
318 window.Spinner = Spinner