Update Holder.js 1.6 to 1.9
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Mark Otto
parent
6f275c6148
commit
4b34f4947a
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@ -1,7 +1,7 @@
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/*
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Holder - 1.6 - client side image placeholders
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(c) 2012 Ivan Malopinsky / http://imsky.co
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Holder - 1.9 - client side image placeholders
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(c) 2012-2013 Ivan Malopinsky / http://imsky.co
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Provided under the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
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Commercial use requires attribution.
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@ -33,6 +33,13 @@ function selector(a){
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//shallow object property extend
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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}
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//hasOwnProperty polyfill
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if (!Object.prototype.hasOwnProperty)
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Object.prototype.hasOwnProperty = function(prop) {
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var proto = this.__proto__ || this.constructor.prototype;
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return (prop in this) && (!(prop in proto) || proto[prop] !== this[prop]);
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}
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function text_size(width, height, template) {
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var dimension_arr = [height, width].sort();
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var maxFactor = Math.round(dimension_arr[1] / 16),
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@ -47,6 +54,7 @@ function draw(ctx, dimensions, template, ratio) {
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var ts = text_size(dimensions.width, dimensions.height, template);
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var text_height = ts.height;
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var width = dimensions.width * ratio, height = dimensions.height * ratio;
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var font = template.font ? template.font : "sans-serif";
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canvas.width = width;
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canvas.height = height;
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ctx.textAlign = "center";
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@ -54,39 +62,42 @@ function draw(ctx, dimensions, template, ratio) {
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ctx.fillStyle = template.background;
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ctx.fillRect(0, 0, width, height);
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ctx.fillStyle = template.foreground;
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ctx.font = "bold " + text_height + "px sans-serif";
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ctx.font = "bold " + text_height + "px "+font;
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var text = template.text ? template.text : (dimensions.width + "x" + dimensions.height);
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if (ctx.measureText(text).width / width > 1) {
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text_height = template.size / (ctx.measureText(text).width / width);
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}
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ctx.font = "bold " + (text_height * ratio) + "px sans-serif";
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//Resetting font size if necessary
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ctx.font = "bold " + (text_height * ratio) + "px "+font;
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ctx.fillText(text, (width / 2), (height / 2), width);
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return canvas.toDataURL("image/png");
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}
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function render(mode, el, holder, src) {
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var dimensions = holder.dimensions,
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theme = holder.theme,
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text = holder.text;
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text = holder.text ? decodeURIComponent(holder.text) : holder.text;
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var dimensions_caption = dimensions.width + "x" + dimensions.height;
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theme = (text ? extend(theme, {
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text: text
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}) : theme);
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theme = (text ? extend(theme, { text: text }) : theme);
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theme = (holder.font ? extend(theme, {font: holder.font}) : theme);
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var ratio = 1;
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if(window.devicePixelRatio && window.devicePixelRatio > 1){
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ratio = window.devicePixelRatio;
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}
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if (mode == "image") {
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el.setAttribute("data-src", src);
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el.setAttribute("alt", text ? text : theme.text ? theme.text + " [" + dimensions_caption + "]" : dimensions_caption);
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el.style.width = dimensions.width + "px";
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el.style.height = dimensions.height + "px";
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if(fallback || !holder.auto){
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el.style.width = dimensions.width + "px";
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el.style.height = dimensions.height + "px";
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}
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if (fallback) {
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el.style.backgroundColor = theme.background;
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}
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else{
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el.setAttribute("src", draw(ctx, dimensions, theme, ratio));
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@ -108,14 +119,7 @@ function fluid(el, holder, src) {
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text: text
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}) : theme);
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var fluid = document.createElement("table");
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fluid.setAttribute("cellspacing",0)
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fluid.setAttribute("cellpadding",0)
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fluid.setAttribute("border",0)
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var row = document.createElement("tr")
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.appendChild(document.createElement("td")
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.appendChild(document.createTextNode(theme.text)));
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var fluid = document.createElement("div");
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fluid.style.backgroundColor = theme.background;
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fluid.style.color = theme.foreground;
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@ -124,31 +128,38 @@ function fluid(el, holder, src) {
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fluid.style.height = holder.dimensions.height + (holder.dimensions.height.indexOf("%")>0?"":"px");
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fluid.id = el.id;
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var frag = document.createDocumentFragment(),
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tbody = document.createElement("tbody"),
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tr = document.createElement("tr"),
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td = document.createElement("td");
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tr.appendChild(td);
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tbody.appendChild(tr);
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frag.appendChild(tbody);
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el.style.width=0;
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el.style.height=0;
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if (theme.text) {
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td.appendChild(document.createTextNode(theme.text))
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fluid.appendChild(frag);
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fluid.appendChild(document.createTextNode(theme.text))
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} else {
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td.appendChild(document.createTextNode(dimensions_caption))
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fluid.appendChild(frag);
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fluid.appendChild(document.createTextNode(dimensions_caption))
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fluid_images.push(fluid);
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setTimeout(fluid_update, 0);
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}
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el.parentNode.replaceChild(fluid, el);
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el.parentNode.insertBefore(fluid, el.nextSibling)
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if(window.jQuery){
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jQuery(function($){
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$(el).on("load", function(){
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el.style.width = fluid.style.width;
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el.style.height = fluid.style.height;
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$(el).show();
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$(fluid).remove();
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});
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})
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}
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}
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function fluid_update() {
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for (i in fluid_images) {
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var el = fluid_images[i];
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var label = el.getElementsByTagName("td")[0].firstChild;
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if(!fluid_images.hasOwnProperty(i)) continue;
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var el = fluid_images[i],
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label = el.firstChild;
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el.style.lineHeight = el.offsetHeight+"px";
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label.data = el.offsetWidth + "x" + el.offsetHeight;
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}
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}
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@ -175,6 +186,11 @@ function parse_flags(flags, options) {
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ret.theme = options.themes[flag];
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} else if (app.flags.text.match(flag)) {
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ret.text = app.flags.text.output(flag);
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} else if(app.flags.font.match(flag)){
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ret.font = app.flags.font.output(flag);
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}
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else if(app.flags.auto.match(flag)){
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ret.auto = true;
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}
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}
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@ -199,7 +215,7 @@ var fluid_images = [];
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var settings = {
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domain: "holder.js",
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images: "img",
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elements: ".holderjs",
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bgnodes: ".holderjs",
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themes: {
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"gray": {
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background: "#eee",
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@ -217,13 +233,13 @@ var settings = {
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size: 12
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}
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},
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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}"
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stylesheet: ".holderjs-fluid {font-size:16px;font-weight:bold;text-align:center;font-family:sans-serif;margin:0}"
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};
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app.flags = {
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dimensions: {
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regex: /(\d+)x(\d+)/,
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regex: /^(\d+)x(\d+)$/,
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output: function (val) {
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var exec = this.regex.exec(val);
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return {
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@ -233,7 +249,7 @@ app.flags = {
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}
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},
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fluid: {
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regex: /([0-9%]+)x([0-9%]+)/,
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regex: /^([0-9%]+)x([0-9%]+)$/,
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output: function (val) {
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var exec = this.regex.exec(val);
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return {
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@ -258,10 +274,20 @@ app.flags = {
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output: function (val) {
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return this.regex.exec(val)[1];
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}
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},
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font: {
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regex: /font\:(.*)/,
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output: function(val){
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return this.regex.exec(val)[1];
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}
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},
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auto: {
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regex: /^auto$/
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}
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}
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for (var flag in app.flags) {
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if(!app.flags.hasOwnProperty(flag)) continue;
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app.flags[flag].match = function (val) {
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return val.match(this.regex)
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}
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@ -285,29 +311,58 @@ app.add_image = function (src, el) {
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};
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app.run = function (o) {
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var options = extend(settings, o),
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images_nodes = selector(options.images),
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elements = selector(options.elements),
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preempted = true,
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images = [];
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var options = extend(settings, o), images = [];
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for (i = 0, l = images_nodes.length; i < l; i++) images.push(images_nodes[i]);
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if(options.images instanceof window.NodeList){
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imageNodes = options.images;
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}
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else if(options.images instanceof window.Node){
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imageNodes = [options.images];
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}
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else{
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imageNodes = selector(options.images);
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}
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var holdercss = document.createElement("style");
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holdercss.type = "text/css";
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holdercss.styleSheet ? holdercss.styleSheet.cssText = options.stylesheet : holdercss.textContent = options.stylesheet;
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document.getElementsByTagName("head")[0].appendChild(holdercss);
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if(options.elements instanceof window.NodeList){
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bgnodes = options.bgnodes;
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}
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else if(options.bgnodes instanceof window.Node){
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bgnodes = [options.bgnodes];
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}
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else{
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bgnodes = selector(options.bgnodes);
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}
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preempted = true;
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for (i = 0, l = imageNodes.length; i < l; i++) images.push(imageNodes[i]);
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var holdercss = document.getElementById("holderjs-style");
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if(!holdercss){
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holdercss = document.createElement("style");
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holdercss.setAttribute("id", "holderjs-style");
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holdercss.type = "text/css";
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document.getElementsByTagName("head")[0].appendChild(holdercss);
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}
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if(holdercss.styleSheet){
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holdercss.styleSheet += options.stylesheet;
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}
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else{
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holdercss.textContent+= options.stylesheet;
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}
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var cssregex = new RegExp(options.domain + "\/(.*?)\"?\\)");
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for (var l = elements.length, i = 0; i < l; i++) {
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var src = window.getComputedStyle(elements[i], null)
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for (var l = bgnodes.length, i = 0; i < l; i++) {
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var src = window.getComputedStyle(bgnodes[i], null)
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.getPropertyValue("background-image");
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var flags = src.match(cssregex);
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if (flags) {
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var holder = parse_flags(flags[1].split("/"), options);
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if (holder) {
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render("background", elements[i], holder, src);
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render("background", bgnodes[i], holder, src);
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}
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}
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}
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@ -339,4 +394,8 @@ contentLoaded(win, function () {
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preempted || app.run();
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});
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})(Holder, window);
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if ( typeof define === "function" && define.amd ) {
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define( "Holder", [], function () { return app; } );
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}
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})(Holder, window);
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