| 1 |
//fgnass.github.com/spin.js#v1.3 |
| 2 |
|
| 3 |
/** |
| 4 |
* Copyright (c) 2011-2013 Felix Gnass |
| 5 |
* Licensed under the MIT license |
| 6 |
*/ |
| 7 |
(function(root, factory) { |
| 8 |
|
| 9 |
/* CommonJS */ |
| 10 |
if (typeof exports == 'object') module.exports = factory() |
| 11 |
|
| 12 |
/* AMD module */ |
| 13 |
else if (typeof define == 'function' && define.amd) define(factory) |
| 14 |
|
| 15 |
/* Browser global */ |
| 16 |
else root.Spinner = factory() |
| 17 |
} |
| 18 |
(this, function() { |
| 19 |
"use strict"; |
| 20 |
|
| 21 |
var prefixes = ['webkit', 'Moz', 'ms', 'O'] /* Vendor prefixes */ |
| 22 |
, animations = {} /* Animation rules keyed by their name */ |
| 23 |
, useCssAnimations /* Whether to use CSS animations or setTimeout */ |
| 24 |
|
| 25 |
/** |
| 26 |
* Utility function to create elements. If no tag name is given, |
| 27 |
* a DIV is created. Optionally properties can be passed. |
| 28 |
*/ |
| 29 |
function createEl(tag, prop) { |
| 30 |
var el = document.createElement(tag || 'div') |
| 31 |
, n |
| 32 |
|
| 33 |
for(n in prop) el[n] = prop[n] |
| 34 |
return el |
| 35 |
} |
| 36 |
|
| 37 |
/** |
| 38 |
* Appends children and returns the parent. |
| 39 |
*/ |
| 40 |
function ins(parent /* child1, child2, ...*/) { |
| 41 |
for (var i=1, n=arguments.length; i<n; i++) |
| 42 |
parent.appendChild(arguments[i]) |
| 43 |
|
| 44 |
return parent |
| 45 |
} |
| 46 |
|
| 47 |
/** |
| 48 |
* Insert a new stylesheet to hold the @keyframe or VML rules. |
| 49 |
*/ |
| 50 |
var sheet = (function() { |
| 51 |
var el = createEl('style', {type : 'text/css'}) |
| 52 |
ins(document.getElementsByTagName('head')[0], el) |
| 53 |
return el.sheet || el.styleSheet |
| 54 |
}()) |
| 55 |
|
| 56 |
/** |
| 57 |
* Creates an opacity keyframe animation rule and returns its name. |
| 58 |
* Since most mobile Webkits have timing issues with animation-delay, |
| 59 |
* we create separate rules for each line/segment. |
| 60 |
*/ |
| 61 |
function addAnimation(alpha, trail, i, lines) { |
| 62 |
var name = ['opacity', trail, ~~(alpha*100), i, lines].join('-') |
| 63 |
, start = 0.01 + i/lines * 100 |
| 64 |
, z = Math.max(1 - (1-alpha) / trail * (100-start), alpha) |
| 65 |
, prefix = useCssAnimations.substring(0, useCssAnimations.indexOf('Animation')).toLowerCase() |
| 66 |
, pre = prefix && '-' + prefix + '-' || '' |
| 67 |
|
| 68 |
if (!animations[name]) { |
| 69 |
sheet.insertRule( |
| 70 |
'@' + pre + 'keyframes ' + name + '{' + |
| 71 |
'0%{opacity:' + z + '}' + |
| 72 |
start + '%{opacity:' + alpha + '}' + |
| 73 |
(start+0.01) + '%{opacity:1}' + |
| 74 |
(start+trail) % 100 + '%{opacity:' + alpha + '}' + |
| 75 |
'100%{opacity:' + z + '}' + |
| 76 |
'}', sheet.cssRules.length) |
| 77 |
|
| 78 |
animations[name] = 1 |
| 79 |
} |
| 80 |
|
| 81 |
return name |
| 82 |
} |
| 83 |
|
| 84 |
/** |
| 85 |
* Tries various vendor prefixes and returns the first supported property. |
| 86 |
*/ |
| 87 |
function vendor(el, prop) { |
| 88 |
var s = el.style |
| 89 |
, pp |
| 90 |
, i |
| 91 |
|
| 92 |
if(s[prop] !== undefined) return prop |
| 93 |
prop = prop.charAt(0).toUpperCase() + prop.slice(1) |
| 94 |
for(i=0; i<prefixes.length; i++) { |
| 95 |
pp = prefixes[i]+prop |
| 96 |
if(s[pp] !== undefined) return pp |
| 97 |
} |
| 98 |
} |
| 99 |
|
| 100 |
/** |
| 101 |
* Sets multiple style properties at once. |
| 102 |
*/ |
| 103 |
function css(el, prop) { |
| 104 |
for (var n in prop) |
| 105 |
el.style[vendor(el, n)||n] = prop[n] |
| 106 |
|
| 107 |
return el |
| 108 |
} |
| 109 |
|
| 110 |
/** |
| 111 |
* Fills in default values. |
| 112 |
*/ |
| 113 |
function merge(obj) { |
| 114 |
for (var i=1; i < arguments.length; i++) { |
| 115 |
var def = arguments[i] |
| 116 |
for (var n in def) |
| 117 |
if (obj[n] === undefined) obj[n] = def[n] |
| 118 |
} |
| 119 |
return obj |
| 120 |
} |
| 121 |
|
| 122 |
/** |
| 123 |
* Returns the absolute page-offset of the given element. |
| 124 |
*/ |
| 125 |
function pos(el) { |
| 126 |
var o = { x:el.offsetLeft, y:el.offsetTop } |
| 127 |
while((el = el.offsetParent)) |
| 128 |
o.x+=el.offsetLeft, o.y+=el.offsetTop |
| 129 |
|
| 130 |
return o |
| 131 |
} |
| 132 |
|
| 133 |
// Built-in defaults |
| 134 |
|
| 135 |
var defaults = { |
| 136 |
lines: 12, // The number of lines to draw |
| 137 |
length: 7, // The length of each line |
| 138 |
width: 5, // The line thickness |
| 139 |
radius: 10, // The radius of the inner circle |
| 140 |
rotate: 0, // Rotation offset |
| 141 |
corners: 1, // Roundness (0..1) |
| 142 |
color: '#000', // #rgb or #rrggbb |
| 143 |
direction: 1, // 1: clockwise, -1: counterclockwise |
| 144 |
speed: 1, // Rounds per second |
| 145 |
trail: 100, // Afterglow percentage |
| 146 |
opacity: 1/4, // Opacity of the lines |
| 147 |
fps: 20, // Frames per second when using setTimeout() |
| 148 |
zIndex: 2e9, // Use a high z-index by default |
| 149 |
className: 'spinner', // CSS class to assign to the element |
| 150 |
top: 'auto', // center vertically |
| 151 |
left: 'auto', // center horizontally |
| 152 |
position: 'relative' // element position |
| 153 |
} |
| 154 |
|
| 155 |
/** The constructor */ |
| 156 |
function Spinner(o) { |
| 157 |
if (typeof this == 'undefined') return new Spinner(o) |
| 158 |
this.opts = merge(o || {}, Spinner.defaults, defaults) |
| 159 |
} |
| 160 |
|
| 161 |
// Global defaults that override the built-ins: |
| 162 |
Spinner.defaults = {} |
| 163 |
|
| 164 |
merge(Spinner.prototype, { |
| 165 |
|
| 166 |
/** |
| 167 |
* Adds the spinner to the given target element. If this instance is already |
| 168 |
* spinning, it is automatically removed from its previous target b calling |
| 169 |
* stop() internally. |
| 170 |
*/ |
| 171 |
spin: function(target) { |
| 172 |
this.stop() |
| 173 |
|
| 174 |
var self = this |
| 175 |
, o = self.opts |
| 176 |
, el = self.el = css(createEl(0, {className: o.className}), {position: o.position, width: 0, zIndex: o.zIndex}) |
| 177 |
, mid = o.radius+o.length+o.width |
| 178 |
, ep // element position |
| 179 |
, tp // target position |
| 180 |
|
| 181 |
if (target) { |
| 182 |
target.insertBefore(el, target.firstChild||null) |
| 183 |
tp = pos(target) |
| 184 |
ep = pos(el) |
| 185 |
css(el, { |
| 186 |
left: (o.left == 'auto' ? tp.x-ep.x + (target.offsetWidth >> 1) : parseInt(o.left, 10) + mid) + 'px', |
| 187 |
top: (o.top == 'auto' ? tp.y-ep.y + (target.offsetHeight >> 1) : parseInt(o.top, 10) + mid) + 'px' |
| 188 |
}) |
| 189 |
} |
| 190 |
|
| 191 |
el.setAttribute('role', 'progressbar') |
| 192 |
self.lines(el, self.opts) |
| 193 |
|
| 194 |
if (!useCssAnimations) { |
| 195 |
// No CSS animation support, use setTimeout() instead |
| 196 |
var i = 0 |
| 197 |
, start = (o.lines - 1) * (1 - o.direction) / 2 |
| 198 |
, alpha |
| 199 |
, fps = o.fps |
| 200 |
, f = fps/o.speed |
| 201 |
, ostep = (1-o.opacity) / (f*o.trail / 100) |
| 202 |
, astep = f/o.lines |
| 203 |
|
| 204 |
;(function anim() { |
| 205 |
i++; |
| 206 |
for (var j = 0; j < o.lines; j++) { |
| 207 |
alpha = Math.max(1 - (i + (o.lines - j) * astep) % f * ostep, o.opacity) |
| 208 |
|
| 209 |
self.opacity(el, j * o.direction + start, alpha, o) |
| 210 |
} |
| 211 |
self.timeout = self.el && setTimeout(anim, ~~(1000/fps)) |
| 212 |
})() |
| 213 |
} |
| 214 |
return self |
| 215 |
}, |
| 216 |
|
| 217 |
/** |
| 218 |
* Stops and removes the Spinner. |
| 219 |
*/ |
| 220 |
stop: function() { |
| 221 |
var el = this.el |
| 222 |
if (el) { |
| 223 |
clearTimeout(this.timeout) |
| 224 |
if (el.parentNode) el.parentNode.removeChild(el) |
| 225 |
this.el = undefined |
| 226 |
} |
| 227 |
return this |
| 228 |
}, |
| 229 |
|
| 230 |
/** |
| 231 |
* Internal method that draws the individual lines. Will be overwritten |
| 232 |
* in VML fallback mode below. |
| 233 |
*/ |
| 234 |
lines: function(el, o) { |
| 235 |
var i = 0 |
| 236 |
, start = (o.lines - 1) * (1 - o.direction) / 2 |
| 237 |
, seg |
| 238 |
|
| 239 |
function fill(color, shadow) { |
| 240 |
return css(createEl(), { |
| 241 |
position: 'absolute', |
| 242 |
width: (o.length+o.width) + 'px', |
| 243 |
height: o.width + 'px', |
| 244 |
background: color, |
| 245 |
boxShadow: shadow, |
| 246 |
transformOrigin: 'left', |
| 247 |
transform: 'rotate(' + ~~(360/o.lines*i+o.rotate) + 'deg) translate(' + o.radius+'px' +',0)', |
| 248 |
borderRadius: (o.corners * o.width>>1) + 'px' |
| 249 |
}) |
| 250 |
} |
| 251 |
|
| 252 |
for (; i < o.lines; i++) { |
| 253 |
seg = css(createEl(), { |
| 254 |
position: 'absolute', |
| 255 |
top: 1+~(o.width/2) + 'px', |
| 256 |
transform: o.hwaccel ? 'translate3d(0,0,0)' : '', |
| 257 |
opacity: o.opacity, |
| 258 |
animation: useCssAnimations && addAnimation(o.opacity, o.trail, start + i * o.direction, o.lines) + ' ' + 1/o.speed + 's linear infinite' |
| 259 |
}) |
| 260 |
|
| 261 |
if (o.shadow) ins(seg, css(fill('#000', '0 0 4px ' + '#000'), {top: 2+'px'})) |
| 262 |
|
| 263 |
ins(el, ins(seg, fill(o.color, '0 0 1px rgba(0,0,0,.1)'))) |
| 264 |
} |
| 265 |
return el |
| 266 |
}, |
| 267 |
|
| 268 |
/** |
| 269 |
* Internal method that adjusts the opacity of a single line. |
| 270 |
* Will be overwritten in VML fallback mode below. |
| 271 |
*/ |
| 272 |
opacity: function(el, i, val) { |
| 273 |
if (i < el.childNodes.length) el.childNodes[i].style.opacity = val |
| 274 |
} |
| 275 |
|
| 276 |
}) |
| 277 |
|
| 278 |
|
| 279 |
function initVML() { |
| 280 |
|
| 281 |
/* Utility function to create a VML tag */ |
| 282 |
function vml(tag, attr) { |
| 283 |
return createEl('<' + tag + ' xmlns="urn:schemas-microsoft.com:vml" class="spin-vml">', attr) |
| 284 |
} |
| 285 |
|
| 286 |
// No CSS transforms but VML support, add a CSS rule for VML elements: |
| 287 |
sheet.addRule('.spin-vml', 'behavior:url(#default#VML)') |
| 288 |
|
| 289 |
Spinner.prototype.lines = function(el, o) { |
| 290 |
var r = o.length+o.width |
| 291 |
, s = 2*r |
| 292 |
|
| 293 |
function grp() { |
| 294 |
return css( |
| 295 |
vml('group', { |
| 296 |
coordsize: s + ' ' + s, |
| 297 |
coordorigin: -r + ' ' + -r |
| 298 |
}), |
| 299 |
{ width: s, height: s } |
| 300 |
) |
| 301 |
} |
| 302 |
|
| 303 |
var margin = -(o.width+o.length)*2 + 'px' |
| 304 |
, g = css(grp(), {position: 'absolute', top: margin, left: margin}) |
| 305 |
, i |
| 306 |
|
| 307 |
function seg(i, dx, filter) { |
| 308 |
ins(g, |
| 309 |
ins(css(grp(), {rotation: 360 / o.lines * i + 'deg', left: ~~dx}), |
| 310 |
ins(css(vml('roundrect', {arcsize: o.corners}), { |
| 311 |
width: r, |
| 312 |
height: o.width, |
| 313 |
left: o.radius, |
| 314 |
top: -o.width>>1, |
| 315 |
filter: filter |
| 316 |
}), |
| 317 |
vml('fill', {color: o.color, opacity: o.opacity}), |
| 318 |
vml('stroke', {opacity: 0}) // transparent stroke to fix color bleeding upon opacity change |
| 319 |
) |
| 320 |
) |
| 321 |
) |
| 322 |
} |
| 323 |
|
| 324 |
if (o.shadow) |
| 325 |
for (i = 1; i <= o.lines; i++) |
| 326 |
seg(i, -2, 'progid:DXImageTransform.Microsoft.Blur(pixelradius=2,makeshadow=1,shadowopacity=.3)') |
| 327 |
|
| 328 |
for (i = 1; i <= o.lines; i++) seg(i) |
| 329 |
return ins(el, g) |
| 330 |
} |
| 331 |
|
| 332 |
Spinner.prototype.opacity = function(el, i, val, o) { |
| 333 |
var c = el.firstChild |
| 334 |
o = o.shadow && o.lines || 0 |
| 335 |
if (c && i+o < c.childNodes.length) { |
| 336 |
c = c.childNodes[i+o]; c = c && c.firstChild; c = c && c.firstChild |
| 337 |
if (c) c.opacity = val |
| 338 |
} |
| 339 |
} |
| 340 |
} |
| 341 |
|
| 342 |
var probe = css(createEl('group'), {behavior: 'url(#default#VML)'}) |
| 343 |
|
| 344 |
if (!vendor(probe, 'transform') && probe.adj) initVML() |
| 345 |
else useCssAnimations = vendor(probe, 'animation') |
| 346 |
|
| 347 |
return Spinner |
| 348 |
|
| 349 |
})); |
| 350 |
|
