//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
}));
