/** Head JS The only script in your Copyright Tero Piirainen (tipiirai) License MIT / http://bit.ly/mit-license Version 0.9 http://headjs.com */ (function(doc) { var head = doc.documentElement, smallwait, isDomReady, domWaiters = [], queue = [], // if not -> defer execution handlers = {}, // user functions waiting for events scripts = {}, // loadable scripts in different states isAsync = doc.createElement("script").async === true || "MozAppearance" in doc.documentElement.style || window.opera; /*** public API ***/ var head_var = window.head_conf && head_conf.head || "head", api = window[head_var] = (window[head_var] || function() { api.ready.apply(null, arguments); }); // states var PRELOADED = 0, PRELOADING = 1, LOADING = 2, LOADED = 3; // Method 1: simply load and let browser take care of ordering if (isAsync) { api.js = function() { var args = arguments, fn = args[args.length -1], els = []; if (!isFunc(fn)) { fn = null; } each(args, function(el, i) { if (el != fn) { el = getScript(el); els.push(el); load(el, fn && i == args.length -2 ? function() { if (allLoaded(els)) { one(fn); } } : null); } }); return api; }; // Method 2: preload with text/cache hack } else { api.js = function() { var args = arguments, rest = [].slice.call(args, 1), next = rest[0]; // wait for a while. immediate execution causes some browsers to ignore caching if (!smallwait) { queue.push(function() { api.js.apply(null, args); }); return api; } // multiple arguments if (next) { // load each(rest, function(el) { if (!isFunc(el)) { preload(getScript(el)); } }); // execute load(getScript(args[0]), isFunc(next) ? next : function() { api.js.apply(null, rest); }); // single script } else { load(getScript(args[0])); } return api; }; } api.ready = function(key, fn) { if (key == 'dom') { if (isDomReady) { one(fn); } else { domWaiters.push(fn); } return api; } // shift arguments if (isFunc(key)) { fn = key; key = "ALL"; } var script = scripts[key]; if (script && script.state == LOADED || key == 'ALL' && allLoaded() && isDomReady) { one(fn); return api; } var arr = handlers[key]; if (!arr) { arr = handlers[key] = [fn]; } else { arr.push(fn); } return api; }; // perform this when DOM is ready api.ready("dom", function() { if (smallwait && allLoaded()) { each(handlers.ALL, function(fn) { one(fn); }); } if (api.feature) { api.feature("domloaded", true); } }); /*** private functions ***/ // call function once function one(fn) { if (fn._done) { return; } fn(); fn._done = 1; } function toLabel(url) { var els = url.split("/"), name = els[els.length -1], i = name.indexOf("?"); return i != -1 ? name.substring(0, i) : name; } function getScript(url) { var script; if (typeof url == 'object') { for (var key in url) { if (url[key]) { script = { name: key, url: url[key] }; } } } else { script = { name: toLabel(url), url: url }; } var existing = scripts[script.name]; if (existing && existing.url === script.url) { return existing; } scripts[script.name] = script; return script; } function each(arr, fn) { if (!arr) { return; } // arguments special type if (typeof arr == 'object') { arr = [].slice.call(arr); } // do the job for (var i = 0; i < arr.length; i++) { fn.call(arr, arr[i], i); } } function isFunc(el) { return Object.prototype.toString.call(el) == '[object Function]'; } function allLoaded(els) { els = els || scripts; var loaded = false, count = 0; for (var name in els) { if (els[name].state != LOADED) { return false; } loaded = true; count++; } return loaded || count === 0; } function onPreload(script) { script.state = PRELOADED; each(script.onpreload, function(el) { el.call(); }); } function preload(script, callback) { if (!script.state) { script.state = PRELOADING; script.onpreload = []; scriptTag({ src: script.url, type: 'cache'}, function() { onPreload(script); }); } } function load(script, callback) { if (script.state == LOADED && callback) { return callback(); } if (script.state == LOADING) { return api.ready(script.name, callback); } if (script.state == PRELOADING) { return script.onpreload.push(function() { load(script, callback); }); } script.state = LOADING; scriptTag(script.url, function() { script.state = LOADED; if (callback) { callback(); } // handlers for this script each(handlers[script.name], function(fn) { one(fn); }); if (isDomReady && allLoaded()) { each(handlers.ALL, function(fn) { one(fn); }); } }); } function scriptTag(src, callback) { var s = doc.createElement('script'); s.type = 'text/' + (src.type || 'javascript'); s.src = src.src || src; s.async = false; s.onreadystatechange = s.onload = function() { var state = s.readyState; if (!callback.done && (!state || /loaded|complete/.test(state))) { callback(); callback.done = true; } }; head.appendChild(s); } setTimeout(function() { smallwait = true; each(queue, function(fn) { fn(); }); }, 0); function fireReady() { if (!isDomReady) { isDomReady = true; each(domWaiters, function(fn) { one(fn); }); } } // W3C if (window.addEventListener) { doc.addEventListener("DOMContentLoaded", fireReady, false); window.addEventListener("onload", fireReady, false); // IE } else if (window.attachEvent) { // for iframes doc.attachEvent("onreadystatechange", function() { if (doc.readyState === "complete" ) { fireReady(); } }); /* // http://javascript.nwbox.com/IEContentLoaded/ */ // avoid frames with different domains issue var frameElement = 1; try { frameElement = window.frameElement; } catch(e) {} if (!frameElement && head.doScroll) { (function() { try { head.doScroll("left"); fireReady(); } catch(e) { setTimeout(arguments.callee, 1); return; } })(); } // fallback window.attachEvent("onload", fireReady); } // enable document.readyState for Firefox <= 3.5 if (!doc.readyState && doc.addEventListener) { doc.readyState = "loading"; doc.addEventListener("DOMContentLoaded", handler = function () { doc.removeEventListener("DOMContentLoaded", handler, false); doc.readyState = "complete"; }, false); } })(document);