/ajax/libs/holder/1.8/holder.js
JavaScript | 362 lines | 299 code | 45 blank | 18 comment | 59 complexity | 67a79db482f2b6cb80e45e68f8212f21 MD5 | raw file
- /*
- Holder - 1.7 - 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}
- //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) {
- 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;
- 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 : (dimensions.width + "x" + dimensions.height);
- if (ctx.measureText(text).width / width > 1) {
- text_height = template.size / (ctx.measureText(text).width / 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);
- 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("div");
- 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;
-
- el.style.width=0;
- el.style.height=0;
-
- if (theme.text) {
- fluid.appendChild(document.createTextNode(theme.text))
- } else {
- fluid.appendChild(document.createTextNode(dimensions_caption))
- fluid_images.push(fluid);
- setTimeout(fluid_update, 0);
- }
- el.parentNode.insertBefore(fluid, el.nextSibling)
-
- if(jQuery){
- jQuery(function($){
- $(el).on("load", function(){
- el.style.width = fluid.style.width;
- el.style.height = fluid.style.height;
- $(el).show();
- $(fluid).remove();
- });
- })
- }
- }
- function fluid_update() {
- for (i in fluid_images) {
- if(!fluid_images.hasOwnProperty(i)) continue;
- var el = fluid_images[i],
- label = el.firstChild;
- el.style.lineHeight = el.offsetHeight+"px";
- label.data = el.offsetWidth + "x" + el.offsetHeight;
- }
- }
- function parse_flags(flags, options) {
- var ret = {
- theme: settings.themes.gray
- }, render = false;
- for (sl = flags.length, j = 0; j < sl; j++) {
- var flag = flags[j];
- if (app.flags.dimensions.match(flag)) {
- render = true;
- ret.dimensions = app.flags.dimensions.output(flag);
- } else if (app.flags.fluid.match(flag)) {
- render = true;
- ret.dimensions = app.flags.fluid.output(flag);
- ret.fluid = true;
- } else if (app.flags.colors.match(flag)) {
- ret.theme = app.flags.colors.output(flag);
- } else if (options.themes[flag]) {
- //If a theme is specified, it will override custom colors
- ret.theme = options.themes[flag];
- } else if (app.flags.text.match(flag)) {
- ret.text = app.flags.text.output(flag);
- } else if(app.flags.font.match(flag)){
- ret.font = app.flags.font.output(flag);
- }
- }
- return render ? ret : false;
- };
- if (!canvas.getContext) {
- fallback = true;
- } else {
- if (canvas.toDataURL("image/png")
- .indexOf("data:image/png") < 0) {
- //Android doesn't support data URI
- fallback = true;
- } else {
- var ctx = canvas.getContext("2d");
- }
- }
- var fluid_images = [];
- var settings = {
- domain: "holder.js",
- images: "img",
- elements: ".holderjs",
- themes: {
- "gray": {
- background: "#eee",
- foreground: "#aaa",
- size: 12
- },
- "social": {
- background: "#3a5a97",
- foreground: "#fff",
- size: 12
- },
- "industrial": {
- background: "#434A52",
- foreground: "#C2F200",
- size: 12
- }
- },
- stylesheet: ".holderjs-fluid {font-size:16px;font-weight:bold;text-align:center;font-family:sans-serif;margin:0}"
- };
- app.flags = {
- dimensions: {
- regex: /^(\d+)x(\d+)$/,
- 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];
- }
- }
- }
- 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_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();
- });
- if ( typeof define === "function" && define.amd ) {
- define( "Holder", [], function () { return app; } );
- }
- })(Holder, window);