| /* |
| |
| Holder - 2.0 - client side image placeholders |
| (c) 2012-2013 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} |
| |
| //hasOwnProperty polyfill |
| if (!Object.prototype.hasOwnProperty) |
| Object.prototype.hasOwnProperty = function(prop) { |
| var proto = this.__proto__ || this.constructor.prototype; |
| return (prop in this) && (!(prop in proto) || proto[prop] !== this[prop]); |
| } |
| |
| function text_size(width, height, template) { |
| height = parseInt(height,10); |
| width = parseInt(width,10); |
| var bigSide = Math.max(height, width) |
| var smallSide = Math.min(height, width) |
| var scale = 1 / 12; |
| var newHeight = Math.min(smallSide * 0.75, 0.75 * bigSide * scale); |
| return { |
| height: Math.round(Math.max(template.size, newHeight)) |
| } |
| } |
| |
| 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; |
| var font = template.font ? template.font : "sans-serif"; |
| 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 " + font; |
| var text = template.text ? template.text : (Math.floor(dimensions.width) + "x" + Math.floor(dimensions.height)); |
| var text_width = ctx.measureText(text).width; |
| if (text_width / width >= 0.75) { |
| text_height = Math.floor(text_height * 0.75 * (width/text_width)); |
| } |
| //Resetting font size if necessary |
| ctx.font = "bold " + (text_height * ratio) + "px " + font; |
| 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 ? decodeURIComponent(holder.text) : holder.text; |
| var dimensions_caption = dimensions.width + "x" + dimensions.height; |
| theme = (text ? extend(theme, { |
| text: text |
| }) : theme); |
| theme = (holder.font ? extend(theme, { |
| font: holder.font |
| }) : theme); |
| if (mode == "image") { |
| el.setAttribute("data-src", src); |
| el.setAttribute("alt", text ? text : theme.text ? theme.text + " [" + dimensions_caption + "]" : dimensions_caption); |
| if (fallback || !holder.auto) { |
| 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 (mode == "background") { |
| if (!fallback) { |
| el.style.backgroundImage = "url(" + draw(ctx, dimensions, theme, ratio) + ")"; |
| el.style.backgroundSize = dimensions.width + "px " + dimensions.height + "px"; |
| } |
| } else if (mode == "fluid") { |
| el.setAttribute("data-src", src); |
| el.setAttribute("alt", text ? text : theme.text ? theme.text + " [" + dimensions_caption + "]" : dimensions_caption); |
| if (dimensions.height.substr(-1) == "%") { |
| el.style.height = dimensions.height |
| } else { |
| el.style.height = dimensions.height + "px" |
| } |
| if (dimensions.width.substr(-1) == "%") { |
| el.style.width = dimensions.width |
| } else { |
| el.style.width = dimensions.width + "px" |
| } |
| if (el.style.display == "inline" || el.style.display == "") { |
| el.style.display = "block"; |
| } |
| if (fallback) { |
| el.style.backgroundColor = theme.background; |
| } else { |
| el.holderData = holder; |
| fluid_images.push(el); |
| fluid_update(el); |
| } |
| } |
| }; |
| |
| function fluid_update(element) { |
| var images; |
| if (element.nodeType == null) { |
| images = fluid_images; |
| } else { |
| images = [element] |
| } |
| for (i in images) { |
| var el = images[i] |
| if (el.holderData) { |
| var holder = el.holderData; |
| el.setAttribute("src", draw(ctx, { |
| height: el.clientHeight, |
| width: el.clientWidth |
| }, holder.theme, ratio)); |
| } |
| } |
| } |
| |
| 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); |
| } else if (app.flags.font.match(flag)) { |
| ret.font = app.flags.font.output(flag); |
| } else if (app.flags.auto.match(flag)) { |
| ret.auto = true; |
| } |
| } |
| |
| 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 dpr = 1, bsr = 1; |
| |
| if(!fallback){ |
| dpr = window.devicePixelRatio || 1, |
| bsr = ctx.webkitBackingStorePixelRatio || ctx.mozBackingStorePixelRatio || ctx.msBackingStorePixelRatio || ctx.oBackingStorePixelRatio || ctx.backingStorePixelRatio || 1; |
| } |
| |
| var ratio = dpr / bsr; |
| |
| var fluid_images = []; |
| |
| var settings = { |
| domain: "holder.js", |
| images: "img", |
| bgnodes: ".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;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%]+)$/, |
| output: function (val) { |
| var exec = this.regex.exec(val); |
| return { |
| width: exec[1], |
| height: exec[2] |
| } |
| } |
| }, |
| colors: { |
| regex: /#([0-9a-f]{3,})\:#([0-9a-f]{3,})/i, |
| output: function (val) { |
| var exec = this.regex.exec(val); |
| return { |
| size: settings.themes.gray.size, |
| foreground: "#" + exec[2], |
| background: "#" + exec[1] |
| } |
| } |
| }, |
| text: { |
| regex: /text\:(.*)/, |
| output: function (val) { |
| return this.regex.exec(val)[1]; |
| } |
| }, |
| font: { |
| regex: /font\:(.*)/, |
| output: function (val) { |
| return this.regex.exec(val)[1]; |
| } |
| }, |
| auto: { |
| regex: /^auto$/ |
| } |
| } |
| |
| for (var flag in app.flags) { |
| if (!app.flags.hasOwnProperty(flag)) continue; |
| 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 = [], imageNodes = [], bgnodes = []; |
| |
| if(typeof(options.images) == "string"){ |
| imageNodes = selector(options.images); |
| } |
| else if (window.NodeList && options.images instanceof window.NodeList) { |
| imageNodes = options.images; |
| } else if (window.Node && options.images instanceof window.Node) { |
| imageNodes = [options.images]; |
| } |
| |
| if(typeof(options.bgnodes) == "string"){ |
| bgnodes = selector(options.bgnodes); |
| } else if (window.NodeList && options.elements instanceof window.NodeList) { |
| bgnodes = options.bgnodes; |
| } else if (window.Node && options.bgnodes instanceof window.Node) { |
| bgnodes = [options.bgnodes]; |
| } |
| |
| preempted = true; |
| |
| for (i = 0, l = imageNodes.length; i < l; i++) images.push(imageNodes[i]); |
| |
| var holdercss = document.getElementById("holderjs-style"); |
| if (!holdercss) { |
| holdercss = document.createElement("style"); |
| holdercss.setAttribute("id", "holderjs-style"); |
| holdercss.type = "text/css"; |
| document.getElementsByTagName("head")[0].appendChild(holdercss); |
| } |
| |
| if (!options.nocss) { |
| if (holdercss.styleSheet) { |
| holdercss.styleSheet.cssText += options.stylesheet; |
| } else { |
| holdercss.appendChild(document.createTextNode(options.stylesheet)); |
| } |
| } |
| |
| var cssregex = new RegExp(options.domain + "\/(.*?)\"?\\)"); |
| |
| for (var l = bgnodes.length, i = 0; i < l; i++) { |
| var src = window.getComputedStyle(bgnodes[i], null) |
| .getPropertyValue("background-image"); |
| var flags = src.match(cssregex); |
| var bgsrc = bgnodes[i].getAttribute("data-background-src"); |
| |
| if (flags) { |
| var holder = parse_flags(flags[1].split("/"), options); |
| if (holder) { |
| render("background", bgnodes[i], holder, src); |
| } |
| } |
| else if(bgsrc != null){ |
| var holder = parse_flags(bgsrc.substr(bgsrc.lastIndexOf(options.domain) + options.domain.length + 1) |
| .split("/"), options); |
| if(holder){ |
| render("background", bgnodes[i], holder, src); |
| } |
| } |
| } |
| |
| for (l = images.length, i = 0; i < l; i++) { |
| |
| var attr_src = attr_data_src = src = null; |
| |
| try{ |
| attr_src = images[i].getAttribute("src"); |
| attr_datasrc = images[i].getAttribute("data-src"); |
| }catch(e){} |
| |
| if (attr_datasrc == null && !! attr_src && attr_src.indexOf(options.domain) >= 0) { |
| src = attr_src; |
| } else if ( !! attr_datasrc && attr_datasrc.indexOf(options.domain) >= 0) { |
| src = attr_datasrc; |
| } |
| |
| if (src) { |
| var holder = parse_flags(src.substr(src.lastIndexOf(options.domain) + options.domain.length + 1) |
| .split("/"), options); |
| if (holder) { |
| if (holder.fluid) { |
| render("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(); |
| }); |
| |
| if (typeof define === "function" && define.amd) { |
| define("Holder", [], function () { |
| return app; |
| }); |
| } |
| |
| })(Holder, window); |