/* Holder - 1.6 - client side image placeholders (c) 2012 Ivan Malopinsky / http://imsky.co Provided under the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0 Commercial use requires attribution. */ var Holder = Holder || {}; (function (app, win) { var preempted = false, fallback = false, canvas = document.createElement('canvas'); //getElementsByClassName polyfill document.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}) //getComputedStyle polyfill window.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}) //http://javascript.nwbox.com/ContentLoaded by Diego Perini with modifications function 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)}}; //https://gist.github.com/991057 by Jed Schmidt with modifications function selector(a){ a=a.match(/^(\W)?(.*)/);var b=document["getElement"+(a[1]?a[1]=="#"?"ById":"sByClassName":"sByTagName")](a[2]); var ret=[]; b!=null&&(b.length?ret=b:b.length==0?ret=b:ret=[b]); return ret; } //shallow object property extend function 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} function text_size(width, height, template) { var dimension_arr = [height, width].sort(); var maxFactor = Math.round(dimension_arr[1] / 16), minFactor = Math.round(dimension_arr[0] / 16); var text_height = Math.max(template.size, maxFactor); return { height: text_height } } function draw(ctx, dimensions, template, ratio) { var ts = text_size(dimensions.width, dimensions.height, template); var text_height = ts.height; var width = dimensions.width * ratio, height = dimensions.height * ratio; canvas.width = width; canvas.height = height; ctx.textAlign = "center"; ctx.textBaseline = "middle"; ctx.fillStyle = template.background; ctx.fillRect(0, 0, width, height); ctx.fillStyle = template.foreground; ctx.font = "bold " + text_height + "px sans-serif"; var text = template.text ? template.text : (dimensions.width + "x" + dimensions.height); if (ctx.measureText(text).width / width > 1) { text_height = template.size / (ctx.measureText(text).width / width); } ctx.font = "bold " + (text_height * ratio) + "px sans-serif"; ctx.fillText(text, (width / 2), (height / 2), width); return canvas.toDataURL("image/png"); } function render(mode, el, holder, src) { var dimensions = holder.dimensions, theme = holder.theme, text = holder.text; var dimensions_caption = dimensions.width + "x" + dimensions.height; theme = (text ? extend(theme, { text: text }) : theme); var ratio = 1; if(window.devicePixelRatio && window.devicePixelRatio > 1){ ratio = window.devicePixelRatio; } if (mode == "image") { el.setAttribute("data-src", src); el.setAttribute("alt", text ? text : theme.text ? theme.text + " [" + dimensions_caption + "]" : dimensions_caption); el.style.width = dimensions.width + "px"; el.style.height = dimensions.height + "px"; if (fallback) { el.style.backgroundColor = theme.background; } else{ el.setAttribute("src", draw(ctx, dimensions, theme, ratio)); } } else { if (!fallback) { el.style.backgroundImage = "url(" + draw(ctx, dimensions, theme, ratio) + ")"; el.style.backgroundSize = dimensions.width+"px "+dimensions.height+"px"; } } }; function fluid(el, holder, src) { var dimensions = holder.dimensions, theme = holder.theme, text = holder.text; var dimensions_caption = dimensions.width + "x" + dimensions.height; theme = (text ? extend(theme, { text: text }) : theme); var fluid = document.createElement("table"); fluid.setAttribute("cellspacing",0) fluid.setAttribute("cellpadding",0) fluid.setAttribute("border",0) var row = document.createElement("tr") .appendChild(document.createElement("td") .appendChild(document.createTextNode(theme.text))); fluid.style.backgroundColor = theme.background; fluid.style.color = theme.foreground; fluid.className = el.className + " holderjs-fluid"; fluid.style.width = holder.dimensions.width + (holder.dimensions.width.indexOf("%")>0?"":"px"); fluid.style.height = holder.dimensions.height + (holder.dimensions.height.indexOf("%")>0?"":"px"); fluid.id = el.id; var frag = document.createDocumentFragment(), tbody = document.createElement("tbody"), tr = document.createElement("tr"), td = document.createElement("td"); tr.appendChild(td); tbody.appendChild(tr); frag.appendChild(tbody); if (theme.text) { td.appendChild(document.createTextNode(theme.text)) fluid.appendChild(frag); } else { td.appendChild(document.createTextNode(dimensions_caption)) fluid.appendChild(frag); fluid_images.push(fluid); setTimeout(fluid_update, 0); } el.parentNode.replaceChild(fluid, el); } function fluid_update() { for (i in fluid_images) { var el = fluid_images[i]; var label = el.getElementsByTagName("td")[0].firstChild; label.data = el.offsetWidth + "x" + el.offsetHeight; } } function parse_flags(flags, options) { var ret = { theme: settings.themes.gray }, render = false; for (sl = flags.length, j = 0; j < sl; j++) { var flag = flags[j]; if (app.flags.dimensions.match(flag)) { render = true; ret.dimensions = app.flags.dimensions.output(flag); } else if (app.flags.fluid.match(flag)) { render = true; ret.dimensions = app.flags.fluid.output(flag); ret.fluid = true; } else if (app.flags.colors.match(flag)) { ret.theme = app.flags.colors.output(flag); } else if (options.themes[flag]) { //If a theme is specified, it will override custom colors ret.theme = options.themes[flag]; } else if (app.flags.text.match(flag)) { ret.text = app.flags.text.output(flag); } } return render ? ret : false; }; if (!canvas.getContext) { fallback = true; } else { if (canvas.toDataURL("image/png") .indexOf("data:image/png") < 0) { //Android doesn't support data URI fallback = true; } else { var ctx = canvas.getContext("2d"); } } var fluid_images = []; var settings = { domain: "holder.js", images: "img", elements: ".holderjs", themes: { "gray": { background: "#eee", foreground: "#aaa", size: 12 }, "social": { background: "#3a5a97", foreground: "#fff", size: 12 }, "industrial": { background: "#434A52", foreground: "#C2F200", size: 12 } }, stylesheet: ".holderjs-fluid {font-size:16px;font-weight:bold;text-align:center;font-family:sans-serif;border-collapse:collapse;border:0;vertical-align:middle;margin:0}" }; app.flags = { dimensions: { regex: /(\d+)x(\d+)/, output: function (val) { var exec = this.regex.exec(val); return { width: +exec[1], height: +exec[2] } } }, fluid: { regex: /([0-9%]+)x([0-9%]+)/, output: function (val) { var exec = this.regex.exec(val); return { width: exec[1], height: exec[2] } } }, colors: { regex: /#([0-9a-f]{3,})\:#([0-9a-f]{3,})/i, output: function (val) { var exec = this.regex.exec(val); return { size: settings.themes.gray.size, foreground: "#" + exec[2], background: "#" + exec[1] } } }, text: { regex: /text\:(.*)/, output: function (val) { return this.regex.exec(val)[1]; } } } for (var flag in app.flags) { app.flags[flag].match = function (val) { return val.match(this.regex) } } app.add_theme = function (name, theme) { name != null && theme != null && (settings.themes[name] = theme); return app; }; app.add_image = function (src, el) { var node = selector(el); if (node.length) { for (var i = 0, l = node.length; i < l; i++) { var img = document.createElement("img") img.setAttribute("data-src", src); node[i].appendChild(img); } } return app; }; app.run = function (o) { var options = extend(settings, o), images_nodes = selector(options.images), elements = selector(options.elements), preempted = true, images = []; for (i = 0, l = images_nodes.length; i < l; i++) images.push(images_nodes[i]); var holdercss = document.createElement("style"); holdercss.type = "text/css"; holdercss.styleSheet ? holdercss.styleSheet.cssText = options.stylesheet : holdercss.textContent = options.stylesheet; document.getElementsByTagName("head")[0].appendChild(holdercss); var cssregex = new RegExp(options.domain + "\/(.*?)\"?\\)"); for (var l = elements.length, i = 0; i < l; i++) { var src = window.getComputedStyle(elements[i], null) .getPropertyValue("background-image"); var flags = src.match(cssregex); if (flags) { var holder = parse_flags(flags[1].split("/"), options); if (holder) { render("background", elements[i], holder, src); } } } for (var l = images.length, i = 0; i < l; i++) { var src = images[i].getAttribute("src") || images[i].getAttribute("data-src"); if (src != null && src.indexOf(options.domain) >= 0) { var holder = parse_flags(src.substr(src.lastIndexOf(options.domain) + options.domain.length + 1) .split("/"), options); if (holder) { if (holder.fluid) { fluid(images[i], holder, src); } else { render("image", images[i], holder, src); } } } } return app; }; contentLoaded(win, function () { if (window.addEventListener) { window.addEventListener("resize", fluid_update, false); window.addEventListener("orientationchange", fluid_update, false); } else { window.attachEvent("onresize", fluid_update) } preempted || app.run(); }); })(Holder, window);