1/* 2 3Holder - 1.9 - 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 var dimension_arr = [height, width].sort(); 45 var maxFactor = Math.round(dimension_arr[1] / 16), 46 minFactor = Math.round(dimension_arr[0] / 16); 47 var text_height = Math.max(template.size, maxFactor); 48 return { 49 height: text_height 50 } 51} 52 53function draw(ctx, dimensions, template, ratio) { 54 var ts = text_size(dimensions.width, dimensions.height, template); 55 var text_height = ts.height; 56 var width = dimensions.width * ratio, height = dimensions.height * ratio; 57 var font = template.font ? template.font : "sans-serif"; 58 canvas.width = width; 59 canvas.height = height; 60 ctx.textAlign = "center"; 61 ctx.textBaseline = "middle"; 62 ctx.fillStyle = template.background; 63 ctx.fillRect(0, 0, width, height); 64 ctx.fillStyle = template.foreground; 65 ctx.font = "bold " + text_height + "px "+font; 66 var text = template.text ? template.text : (dimensions.width + "x" + dimensions.height); 67 if (ctx.measureText(text).width / width > 1) { 68 text_height = template.size / (ctx.measureText(text).width / width); 69 } 70 //Resetting font size if necessary 71 ctx.font = "bold " + (text_height * ratio) + "px "+font; 72 ctx.fillText(text, (width / 2), (height / 2), width); 73 return canvas.toDataURL("image/png"); 74} 75 76function render(mode, el, holder, src) { 77 var dimensions = holder.dimensions, 78 theme = holder.theme, 79 text = holder.text ? decodeURIComponent(holder.text) : holder.text; 80 var dimensions_caption = dimensions.width + "x" + dimensions.height; 81 theme = (text ? extend(theme, { text: text }) : theme); 82 theme = (holder.font ? extend(theme, {font: holder.font}) : theme); 83 84 var ratio = 1; 85 if(window.devicePixelRatio && window.devicePixelRatio > 1){ 86 ratio = window.devicePixelRatio; 87 } 88 89 if (mode == "image") { 90 el.setAttribute("data-src", src); 91 el.setAttribute("alt", text ? text : theme.text ? theme.text + " [" + dimensions_caption + "]" : dimensions_caption); 92 93 if(fallback || !holder.auto){ 94 el.style.width = dimensions.width + "px"; 95 el.style.height = dimensions.height + "px"; 96 } 97 98 if (fallback) { 99 el.style.backgroundColor = theme.background; 100 101 } 102 else{ 103 el.setAttribute("src", draw(ctx, dimensions, theme, ratio)); 104 } 105 } else { 106 if (!fallback) { 107 el.style.backgroundImage = "url(" + draw(ctx, dimensions, theme, ratio) + ")"; 108 el.style.backgroundSize = dimensions.width+"px "+dimensions.height+"px"; 109 } 110 } 111}; 112 113function fluid(el, holder, src) { 114 var dimensions = holder.dimensions, 115 theme = holder.theme, 116 text = holder.text; 117 var dimensions_caption = dimensions.width + "x" + dimensions.height; 118 theme = (text ? extend(theme, { 119 text: text 120 }) : theme); 121 122 var fluid = document.createElement("div"); 123 124 fluid.style.backgroundColor = theme.background; 125 fluid.style.color = theme.foreground; 126 fluid.className = el.className + " holderjs-fluid"; 127 fluid.style.width = holder.dimensions.width + (holder.dimensions.width.indexOf("%")>0?"":"px"); 128 fluid.style.height = holder.dimensions.height + (holder.dimensions.height.indexOf("%")>0?"":"px"); 129 fluid.id = el.id; 130 131 el.style.width=0; 132 el.style.height=0; 133 134 if (theme.text) { 135 fluid.appendChild(document.createTextNode(theme.text)) 136 } else { 137 fluid.appendChild(document.createTextNode(dimensions_caption)) 138 fluid_images.push(fluid); 139 setTimeout(fluid_update, 0); 140 } 141 142 el.parentNode.insertBefore(fluid, el.nextSibling) 143
144 if(window.jQuery){ 145 jQuery(function($){ 146 $(el).on("load", function(){ 147 el.style.width = fluid.style.width; 148 el.style.height = fluid.style.height; 149 $(el).show(); 150 $(fluid).remove(); 151 }); 152 }) 153 } 154} 155 156function fluid_update() { 157 for (i in fluid_images) { 158 if(!fluid_images.hasOwnProperty(i)) continue; 159 var el = fluid_images[i], 160 label = el.firstChild; 161 162 el.style.lineHeight = el.offsetHeight+"px"; 163 label.data = el.offsetWidth + "x" + el.offsetHeight; 164 } 165} 166 167function parse_flags(flags, options) { 168 169 var ret = { 170 theme: settings.themes.gray 171 }, render = false; 172 173 for (sl = flags.length, j = 0; j < sl; j++) { 174 var flag = flags[j]; 175 if (app.flags.dimensions.match(flag)) { 176 render = true; 177 ret.dimensions = app.flags.dimensions.output(flag); 178 } else if (app.flags.fluid.match(flag)) { 179 render = true; 180 ret.dimensions = app.flags.fluid.output(flag); 181 ret.fluid = true; 182 } else if (app.flags.colors.match(flag)) { 183 ret.theme = app.flags.colors.output(flag); 184 } else if (options.themes[flag]) { 185 //If a theme is specified, it will override custom colors 186 ret.theme = options.themes[flag]; 187 } else if (app.flags.text.match(flag)) { 188 ret.text = app.flags.text.output(flag); 189 } else if(app.flags.font.match(flag)){ 190 ret.font = app.flags.font.output(flag); 191 } 192 else if(app.flags.auto.match(flag)){ 193 ret.auto = true; 194 } 195 } 196 197 return render ? ret : false;
198 199}; 200 201if (!canvas.getContext) { 202 fallback = true; 203} else { 204 if (canvas.toDataURL("image/png") 205 .indexOf("data:image/png") < 0) { 206 //Android doesn't support data URI 207 fallback = true; 208 } else { 209 var ctx = canvas.getContext("2d"); 210 } 211} 212 213var fluid_images = []; 214 215var settings = { 216 domain: "holder.js", 217 images: "img", 218 bgnodes: ".holderjs", 219 themes: { 220 "gray": { 221 background: "#eee", 222 foreground: "#aaa", 223 size: 12 224 }, 225 "social": { 226 background: "#3a5a97", 227 foreground: "#fff", 228 size: 12 229 }, 230 "industrial": { 231 background: "#434A52", 232 foreground: "#C2F200", 233 size: 12 234 } 235 }, 236 stylesheet: ".holderjs-fluid {font-size:16px;font-weight:bold;text-align:center;font-family:sans-serif;margin:0}" 237}; 238 239 240app.flags = { 241 dimensions: { 242 regex: /^(\d+)x(\d+)$/, 243 output: function (val) { 244 var exec = this.regex.exec(val); 245 return { 246 width: +exec[1], 247 height: +exec[2] 248 } 249 } 250 }, 251 fluid: { 252 regex: /^([0-9%]+)x([0-9%]+)$/, 253 output: function (val) { 254 var exec = this.regex.exec(val); 255 return { 256 width: exec[1], 257 height: exec[2] 258 } 259 } 260 }, 261 colors: { 262 regex: /#([0-9a-f]{3,})\:#([0-9a-f]{3,})/i, 263 output: function (val) { 264 var exec = this.regex.exec(val); 265 return { 266 size: settings.themes.gray.size, 267 foreground: "#" + exec[2], 268 background: "#" + exec[1] 269 } 270 } 271 }, 272 text: { 273 regex: /text\:(.*)/, 274 output: function (val) { 275 return this.regex.exec(val)[1]; 276 } 277 }, 278 font: { 279 regex: /font\:(.*)/, 280 output: function(val){ 281 return this.regex.exec(val)[1]; 282 } 283 }, 284 auto: { 285 regex: /^auto$/ 286 } 287} 288 289for (var flag in app.flags) { 290 if(!app.flags.hasOwnProperty(flag)) continue; 291 app.flags[flag].match = function (val) { 292 return val.match(this.regex) 293 } 294} 295 296app.add_theme = function (name, theme) { 297 name != null && theme != null && (settings.themes[name] = theme); 298 return app; 299}; 300 301app.add_image = function (src, el) { 302 var node = selector(el); 303 if (node.length) { 304 for (var i = 0, l = node.length; i < l; i++) { 305 var img = document.createElement("img") 306 img.setAttribute("data-src", src); 307 node[i].appendChild(img); 308 } 309 } 310 return app; 311}; 312 313app.run = function (o) { 314 var options = extend(settings, o), images = []; 315 316 if(options.images instanceof window.NodeList){ 317 imageNodes = options.images; 318 } 319 else if(options.images instanceof window.Node){ 320 imageNodes = [options.images]; 321 } 322 else{ 323 imageNodes = selector(options.images); 324 } 325 326 if(options.elements instanceof window.NodeList){ 327 bgnodes = options.bgnodes; 328 } 329 else if(options.bgnodes instanceof window.Node){ 330 bgnodes = [options.bgnodes]; 331 } 332 else{ 333 bgnodes = selector(options.bgnodes); 334 } 335 336 preempted = true; 337 338 for (i = 0, l = imageNodes.length; i < l; i++) images.push(imageNodes[i]); 339 340 var holdercss = document.getElementById("holderjs-style"); 341 342 if(!holdercss){ 343 holdercss = document.createElement("style"); 344 holdercss.setAttribute("id", "holderjs-style"); 345 holdercss.type = "text/css"; 346 document.getElementsByTagName("head")[0].appendChild(holdercss); 347 } 348 349 if(holdercss.styleSheet){ 350 holdercss.styleSheet += options.stylesheet; 351 } 352 else{ 353 holdercss.textContent+= options.stylesheet; 354 } 355 356 var cssregex = new RegExp(options.domain + "\/(.*?)\"?\\)"); 357 358 for (var l = bgnodes.length, i = 0; i < l; i++) { 359 var src = window.getComputedStyle(bgnodes[i], null) 360 .getPropertyValue("background-image"); 361 var flags = src.match(cssregex); 362 if (flags) { 363 var holder = parse_flags(flags[1].split("/"), options); 364 if (holder) { 365 render("background", bgnodes[i], holder, src); 366 } 367 } 368 } 369 370 for (var l = images.length, i = 0; i < l; i++) { 371 var src = images[i].getAttribute("src") || images[i].getAttribute("data-src"); 372 if (src != null && src.indexOf(options.domain) >= 0) { 373 var holder = parse_flags(src.substr(src.lastIndexOf(options.domain) + options.domain.length + 1) 374 .split("/"), options); 375 if (holder) { 376 if (holder.fluid) { 377 fluid(images[i], holder, src); 378 } else { 379 render("image", images[i], holder, src); 380 } 381 } 382 } 383 } 384 return app; 385}; 386 387contentLoaded(win, function () { 388 if (window.addEventListener) { 389 window.addEventListener("resize", fluid_update, false); 390 window.addEventListener("orientationchange", fluid_update, false); 391 } else { 392 window.attachEvent("onresize", fluid_update) 393 } 394 preempted || app.run(); 395}); 396 397if ( typeof define === "function" && define.amd ) { 398 define( "Holder", [], function () { return app; } ); 399} 400 401})(Holder, window);
Line numbers count LF bytes from the start of the resource, as the search results do. Vendor segments are library code the classifier recognised; they are stored but not indexed. Bytes are shown as Latin1 characters, one per byte.