spin.js UI Component
http://spin.js.org/#v2.3.2
/**
* Copyright (c) 2011-2014 Felix Gnass
* Licensed under the MIT license
* http://spin.js.org/
*
* Example:
var opts = {
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
, scale: 1.0 // Scales overall size of the spinner
, corners: 1 // Roundness (0..1)
, color: '#000' // #rgb or #rrggbb
, opacity: 1/4 // Opacity of the lines
, rotate: 0 // Rotation offset
, direction: 1 // 1: clockwise, -1: counterclockwise
, speed: 1 // Rounds per second
, trail: 100 // Afterglow percentage
, 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: '50%' // center vertically
, left: '50%' // center horizontally
, shadow: false // Whether to render a shadow
, hwaccel: false // Whether to use hardware acceleration (might be buggy)
, position: 'absolute' // Element positioning
}
var target = document.getElementById('foo')
var spinner = new Spinner(opts).spin(target)
*/
;(function (root, factory) {
/* CommonJS */
if (typeof module == 'object' && module.exports) 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 */
, sheet /* A stylesheet to hold the @keyframe or VML rules. */
/**
* 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
}
/**
* 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
prop = prop.charAt(0).toUpperCase() + prop.slice(1)
if (s[prop] !== undefined) return prop
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 line color from the given string or array.
*/
function getColor (color, idx) {
return typeof color == 'string' ? color : color[idx % color.length]
}
// 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
, scale: 1.0 // Scales overall size of the spinner
, corners: 1 // Roundness (0..1)
, color: '#000' // #rgb or #rrggbb
, opacity: 1/4 // Opacity of the lines
, rotate: 0 // Rotation offset
, direction: 1 // 1: clockwise, -1: counterclockwise
, speed: 1 // Rounds per second
, trail: 100 // Afterglow percentage
, 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: '50%' // center vertically
, left: '50%' // center horizontally
, shadow: false // Whether to render a shadow
, hwaccel: false // Whether to use hardware acceleration (might be buggy)
, position: 'absolute' // Element positioning
}
/** The constructor */
function 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 = createEl(null, {className: o.className})
css(el, {
position: o.position
, width: 0
, zIndex: o.zIndex
, left: o.left
, top: o.top
})
if (target) {
target.insertBefore(el, target.firstChild || null)
}
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.scale * (o.length + o.width) + 'px'
, height: o.scale * o.width + 'px'
, background: color
, boxShadow: shadow
, transformOrigin: 'left'
, transform: 'rotate(' + ~~(360/o.lines*i + o.rotate) + 'deg) translate(' + o.scale*o.radius + 'px' + ',0)'
, borderRadius: (o.corners * o.scale * o.width >> 1) + 'px'
})
}
for (; i < o.lines; i++) {
seg = css(createEl(), {
position: 'absolute'
, top: 1 + ~(o.scale * 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: '2px'}))
ins(el, ins(seg, fill(getColor(o.color, i), '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.scale * (o.length + o.width)
, s = o.scale * 2 * r
function grp () {
return css(
vml('group', {
coordsize: s + ' ' + s
, coordorigin: -r + ' ' + -r
})
, { width: s, height: s }
)
}
var margin = -(o.width + o.length) * o.scale * 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.scale * o.width
, left: o.scale * o.radius
, top: -o.scale * o.width >> 1
, filter: filter
}
)
, vml('fill', {color: getColor(o.color, i), 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
}
}
}
if (typeof document !== 'undefined') {
sheet = (function () {
var el = createEl('style', {type : 'text/css'})
ins(document.getElementsByTagName('head')[0], el)
return el.sheet || el.styleSheet
}())
var probe = css(createEl('group'), {behavior: 'url(#default#VML)'})
if (!vendor(probe, 'transform') && probe.adj) initVML()
else useCssAnimations = vendor(probe, 'animation')
}
return Spinner
}));
-------------------------------
Usage
1.target of spin, a loading div
<style>
.ui-loader{
position:fixed;
padding:0;
margin:0;
top:0;
left:0;
z-index:999;
width: 100%;
height: 100%;
background:rgba(255,255,255,0.5);
}
</style>
<div class="ui-loader" id="progress_spinner" style="display:none;"></div>
2.spin
var opts = { lines: 13 // The number of lines to draw , length: 28 // The length of each line , width: 14 // The line thickness , radius: 42 // The radius of the inner circle , scale: 1 // Scales overall size of the spinner , corners: 1 // Corner roundness (0..1) , color: '#000' // #rgb or #rrggbb or array of colors , opacity: 0.25 // Opacity of the lines , rotate: 0 // The rotation offset , direction: 1 // 1: clockwise, -1: counterclockwise , speed: 1 // Rounds per second , trail: 60 // Afterglow percentage , fps: 20 // Frames per second when using setTimeout() as a fallback for CSS , zIndex: 2e9 // The z-index (defaults to 2000000000) , className: 'spinner' // The CSS class to assign to the spinner , top: '50%' // Top position relative to parent , left: '50%' // Left position relative to parent , shadow: false // Whether to render a shadow , hwaccel: false // Whether to use hardware acceleration , position: 'absolute' // Element positioning }
var target = document.getElementById('progress_spinner')
var spinner = new Spinner(opts).spin(target);
$(".ui-loader").show();
//or
var spinner = new Spinner().spin(); target.appendChild(spinner.el);
//Hiding the spinner. Stopped spinners may be reused by calling spin() again.
spinner.stop(); spinner.spin();
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