1/* 2 3Holder - 2.0 - client side image placeholders 4(c) 2012-2013 Ivan Malopinsky / http://imsky.co 5 6Provided under the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0 7Commercial use requires attribution. 8 9*/ 10 11var Holder = Holder || {}; 12(function (app, win) { 13 14var preempted = false, 15fallback = false, 16canvas = document.createElement('canvas'); 17 18//getElementsByClassName polyfill 19document.getElementsByClassName||(document.getElementsByClassName=function(e){var t=document,n,r,i,s=[];if(t.querySelectorAll)return t.querySelectorAll("."+e);if(t.evaluate){r=".//*[contains(concat(' ', @class, ' '), ' "+e+" ')]",n=t.evaluate(r,t,null,0,null);while(i=n.iterateNext())s.push(i)}else{n=t.getElementsByTagName("*"),r=new RegExp("(^|\\s)"+e+"(\\s|$)");for(i=0;i<n.length;i++)r.test(n[i].className)&&s.push(n[i])}return s}) 20 21//getComputedStyle polyfill 22window.getComputedStyle||(window.getComputedStyle=function(e,t){return this.el=e,this.getPropertyValue=function(t){var n=/(\-([a-z]){1})/g;return t=="float"&&(t="styleFloat"),n.test(t)&&(t=t.replace(n,function(){return arguments[2].toUpperCase()})),e.currentStyle[t]?e.currentStyle[t]:null},this}) 23 24//http://javascript.nwbox.com/ContentLoaded by Diego Perini with modifications 25function contentLoaded(n,t){var l="complete",s="readystatechange",u=!1,h=u,c=!0,i=n.document,a=i.documentElement,e=i.addEventListener?"addEventListener":"attachEvent",v=i.addEventListener?"removeEventListener":"detachEvent",f=i.addEventListener?"":"on",r=function(e){(e.type!=s||i.readyState==l)&&((e.type=="load"?n:i)[v](f+e.type,r,u),!h&&(h=!0)&&t.call(n,null))},o=function(){try{a.doScroll("left")}catch(n){setTimeout(o,50);return}r("poll")};if(i.readyState==l)t.call(n,"lazy");else{if(i.createEventObject&&a.doScroll){try{c=!n.frameElement}catch(y){}c&&o()}i[e](f+"DOMContentLoaded",r,u),i[e](f+s,r,u),n[e](f+"load",r,u)}}; 26 27//https://gist.github.com/991057 by Jed Schmidt with modifications 28function selector(a){ 29 a=a.match(/^(\W)?(.*)/);var b=document["getElement"+(a[1]?a[1]=="#"?"ById":"sByClassName":"sByTagName")](a[2]); 30 var ret=[]; b!=null&&(b.length?ret=b:b.length==0?ret=b:ret=[b]); return ret; 31} 32 33//shallow object property extend 34function extend(a,b){var c={};for(var d in a)c[d]=a[d];for(var e in b)c[e]=b[e];return c} 35 36//hasOwnProperty polyfill 37if (!Object.prototype.hasOwnProperty) 38 Object.prototype.hasOwnProperty = function(prop) { 39 var proto = this.__proto__ || this.constructor.prototype; 40 return (prop in this) && (!(prop in proto) || proto[prop] !== this[prop]); 41 } 42 43function text_size(width, height, template) { 44 height = parseInt(height,10); 45 width = parseInt(width,10); 46 var bigSide = Math.max(height, width) 47 var smallSide = Math.min(height, width) 48 var scale = 1 / 12; 49 var newHeight = Math.min(smallSide * 0.75, 0.75 * bigSide * scale); 50 return { 51 height: Math.round(Math.max(template.size, newHeight)) 52 } 53} 54 55function draw(ctx, dimensions, template, ratio) { 56 var ts = text_size(dimensions.width, dimensions.height, template); 57 var text_height = ts.height; 58 var width = dimensions.width * ratio, 59 height = dimensions.height * ratio; 60 var font = template.font ? template.font : "sans-serif"; 61 canvas.width = width; 62 canvas.height = height; 63 ctx.textAlign = "center"; 64 ctx.textBaseline = "middle"; 65 ctx.fillStyle = template.background; 66 ctx.fillRect(0, 0, width, height); 67 ctx.fillStyle = template.foreground; 68 ctx.font = "bold " + text_height + "px " + font; 69 var text = template.text ? template.text : (Math.floor(dimensions.width) + "x" + Math.floor(dimensions.height)); 70 var text_width = ctx.measureText(text).width; 71 if (text_width / width >= 0.75) { 72 text_height = Math.floor(text_height * 0.75 * (width/text_width)); 73 } 74 //Resetting font size if necessary 75 ctx.font = "bold " + (text_height * ratio) + "px " + font; 76 ctx.fillText(text, (width / 2), (height / 2), width); 77 return canvas.toDataURL("image/png"); 78} 79 80function render(mode, el, holder, src) { 81 var dimensions = holder.dimensions, 82 theme = holder.theme, 83 text = holder.text ? decodeURIComponent(holder.text) : holder.text; 84 var dimensions_caption = dimensions.width + "x" + dimensions.height; 85 theme = (text ? extend(theme, { 86 text: text 87 }) : theme); 88 theme = (holder.font ? extend(theme, { 89 font: holder.font 90 }) : theme); 91 if (mode == "image") { 92 el.setAttribute("data-src", src); 93 el.setAttribute("alt", text ? text : theme.text ? theme.text + " [" + dimensions_caption + "]" : dimensions_caption); 94 if (fallback || !holder.auto) { 95 el.style.width = dimensions.width + "px"; 96 el.style.height = dimensions.height + "px"; 97 } 98 if (fallback) { 99 el.style.backgroundColor = theme.background; 100 } else { 101 el.setAttribute("src", draw(ctx, dimensions, theme, ratio)); 102 } 103 } else if (mode == "background") { 104 if (!fallback) { 105 el.style.backgroundImage = "url(" + draw(ctx, dimensions, theme, ratio) + ")"; 106 el.style.backgroundSize = dimensions.width + "px " + dimensions.height + "px"; 107 } 108 } else if (mode == "fluid") { 109 el.setAttribute("data-src", src); 110 el.setAttribute("alt", text ? text : theme.text ? theme.text + " [" + dimensions_caption + "]" : dimensions_caption); 111 if (dimensions.height.substr(-1) == "%") { 112 el.style.height = dimensions.height 113 } else { 114 el.style.height = dimensions.height + "px" 115 } 116 if (dimensions.width.substr(-1) == "%") { 117 el.style.width = dimensions.width 118 } else { 119 el.style.width = dimensions.width + "px" 120 } 121 if (el.style.display == "inline" || el.style.display == "") { 122 el.style.display = "block"; 123 } 124 if (fallback) { 125 el.style.backgroundColor = theme.background; 126 } else { 127 el.holderData = holder; 128 fluid_images.push(el); 129 fluid_update(el); 130 } 131 } 132}; 133 134function fluid_update(element) { 135 var images; 136 if (element.nodeType == null) { 137 images = fluid_images; 138 } else { 139 images = [element] 140 } 141 for (i in images) { 142 var el = images[i] 143 if (el.holderData) { 144 var holder = el.holderData; 145 el.setAttribute("src", draw(ctx, { 146 height: el.clientHeight, 147 width: el.clientWidth 148 }, holder.theme, ratio)); 149 } 150 } 151} 152 153function parse_flags(flags, options) { 154 155 var ret = { 156 theme: settings.themes.gray 157 }, render = false;
158 159 for (sl = flags.length, j = 0; j < sl; j++) { 160 var flag = flags[j]; 161 if (app.flags.dimensions.match(flag)) { 162 render = true; 163 ret.dimensions = app.flags.dimensions.output(flag); 164 } else if (app.flags.fluid.match(flag)) { 165 render = true; 166 ret.dimensions = app.flags.fluid.output(flag); 167 ret.fluid = true; 168 } else if (app.flags.colors.match(flag)) { 169 ret.theme = app.flags.colors.output(flag); 170 } else if (options.themes[flag]) { 171 //If a theme is specified, it will override custom colors 172 ret.theme = options.themes[flag]; 173 } else if (app.flags.text.match(flag)) { 174 ret.text = app.flags.text.output(flag); 175 } else if (app.flags.font.match(flag)) { 176 ret.font = app.flags.font.output(flag); 177 } else if (app.flags.auto.match(flag)) { 178 ret.auto = true; 179 } 180 } 181 182 return render ? ret : false; 183 184}; 185 186 187 188if (!canvas.getContext) { 189 fallback = true; 190} else { 191 if (canvas.toDataURL("image/png") 192 .indexOf("data:image/png") < 0) { 193 //Android doesn't support data URI 194 fallback = true; 195 } else { 196 var ctx = canvas.getContext("2d"); 197 } 198} 199 200var dpr = 1, bsr = 1; 201 202if(!fallback){ 203 dpr = window.devicePixelRatio || 1, 204 bsr = ctx.webkitBackingStorePixelRatio || ctx.mozBackingStorePixelRatio || ctx.msBackingStorePixelRatio || ctx.oBackingStorePixelRatio || ctx.backingStorePixelRatio || 1; 205} 206 207var ratio = dpr / bsr; 208 209var fluid_images = []; 210 211var settings = { 212 domain: "holder.js", 213 images: "img", 214 bgnodes: ".holderjs", 215 themes: { 216 "gray": { 217 background: "#eee", 218 foreground: "#aaa", 219 size: 12 220 }, 221 "social": { 222 background: "#3a5a97", 223 foreground: "#fff", 224 size: 12 225 }, 226 "industrial": { 227 background: "#434A52", 228 foreground: "#C2F200", 229 size: 12 230 } 231 }, 232 stylesheet: ".holderjs-fluid {font-size:16px;font-weight:bold;text-align:center;font-family:sans-serif;margin:0}" 233}; 234 235 236app.flags = { 237 dimensions: { 238 regex: /^(\d+)x(\d+)$/, 239 output: function (val) { 240 var exec = this.regex.exec(val); 241 return { 242 width: +exec[1], 243 height: +exec[2] 244 } 245 } 246 }, 247 fluid: { 248 regex: /^([0-9%]+)x([0-9%]+)$/, 249 output: function (val) { 250 var exec = this.regex.exec(val); 251 return { 252 width: exec[1], 253 height: exec[2] 254 } 255 } 256 }, 257 colors: { 258 regex: /#([0-9a-f]{3,})\:#([0-9a-f]{3,})/i, 259 output: function (val) { 260 var exec = this.regex.exec(val); 261 return { 262 size: settings.themes.gray.size, 263 foreground: "#" + exec[2], 264 background: "#" + exec[1] 265 } 266 } 267 }, 268 text: { 269 regex: /text\:(.*)/, 270 output: function (val) { 271 return this.regex.exec(val)[1]; 272 } 273 }, 274 font: { 275 regex: /font\:(.*)/, 276 output: function (val) { 277 return this.regex.exec(val)[1]; 278 } 279 }, 280 auto: { 281 regex: /^auto$/ 282 } 283} 284 285for (var flag in app.flags) { 286 if (!app.flags.hasOwnProperty(flag)) continue; 287 app.flags[flag].match = function (val) { 288 return val.match(this.regex) 289 } 290} 291 292app.add_theme = function (name, theme) { 293 name != null && theme != null && (settings.themes[name] = theme); 294 return app; 295}; 296 297app.add_image = function (src, el) { 298 var node = selector(el); 299 if (node.length) { 300 for (var i = 0, l = node.length; i < l; i++) { 301 var img = document.createElement("img") 302 img.setAttribute("data-src", src); 303 node[i].appendChild(img); 304 } 305 } 306 return app; 307}; 308 309app.run = function (o) { 310 var options = extend(settings, o), 311 images = [], imageNodes = [], bgnodes = []; 312 313 if(typeof(options.images) == "string"){ 314 imageNodes = selector(options.images); 315 } 316 else if (window.NodeList && options.images instanceof window.NodeList) { 317 imageNodes = options.images; 318 } else if (window.Node && options.images instanceof window.Node) { 319 imageNodes = [options.images]; 320 } 321 322 if(typeof(options.bgnodes) == "string"){ 323 bgnodes = selector(options.bgnodes); 324 } else if (window.NodeList && options.elements instanceof window.NodeList) { 325 bgnodes = options.bgnodes; 326 } else if (window.Node && options.bgnodes instanceof window.Node) { 327 bgnodes = [options.bgnodes]; 328 } 329 330 preempted = true; 331 332 for (i = 0, l = imageNodes.length; i < l; i++) images.push(imageNodes[i]); 333 334 var holdercss = document.getElementById("holderjs-style"); 335 if (!holdercss) { 336 holdercss = document.createElement("style"); 337 holdercss.setAttribute("id", "holderjs-style"); 338 holdercss.type = "text/css"; 339 document.getElementsByTagName("head")[0].appendChild(holdercss); 340 } 341 342 if (!options.nocss) { 343 if (holdercss.styleSheet) { 344 holdercss.styleSheet.cssText += options.stylesheet; 345 } else { 346 holdercss.appendChild(document.createTextNode(options.stylesheet)); 347 } 348 } 349 350 var cssregex = new RegExp(options.domain + "\/(.*?)\"?\\)"); 351 352 for (var l = bgnodes.length, i = 0; i < l; i++) { 353 var src = window.getComputedStyle(bgnodes[i], null) 354 .getPropertyValue("background-image"); 355 var flags = src.match(cssregex); 356 var bgsrc = bgnodes[i].getAttribute("data-background-src"); 357 358 if (flags) { 359 var holder = parse_flags(flags[1].split("/"), options); 360 if (holder) { 361 render("background", bgnodes[i], holder, src); 362 } 363 } 364 else if(bgsrc != null){ 365 var holder = parse_flags(bgsrc.substr(bgsrc.lastIndexOf(options.domain) + options.domain.length + 1) 366 .split("/"), options); 367 if(holder){ 368 render("background", bgnodes[i], holder, src); 369 } 370 } 371 } 372 373 for (l = images.length, i = 0; i < l; i++) { 374 375 var attr_src = attr_data_src = src = null; 376 377 try{ 378 attr_src = images[i].getAttribute("src"); 379 attr_datasrc = images[i].getAttribute("data-src"); 380 }catch(e){} 381 382 if (attr_datasrc == null && !! attr_src && attr_src.indexOf(options.domain) >= 0) { 383 src = attr_src; 384 } else if ( !! attr_datasrc && attr_datasrc.indexOf(options.domain) >= 0) { 385 src = attr_datasrc; 386 } 387 388 if (src) { 389 var holder = parse_flags(src.substr(src.lastIndexOf(options.domain) + options.domain.length + 1) 390 .split("/"), options); 391 if (holder) { 392 if (holder.fluid) { 393 render("fluid", images[i], holder, src) 394 } else { 395 render("image", images[i], holder, src); 396 } 397 } 398 } 399 } 400 return app; 401}; 402 403contentLoaded(win, function () { 404 if (window.addEventListener) { 405 window.addEventListener("resize", fluid_update, false); 406 window.addEventListener("orientationchange", fluid_update, false); 407 } else { 408 window.attachEvent("onresize", fluid_update) 409 } 410 preempted || app.run(); 411}); 412 413if (typeof define === "function" && define.amd) { 414 define("Holder", [], function () { 415 return app; 416 }); 417} 418 419})(Holder, window);
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