708 lines
22 KiB
JavaScript
708 lines
22 KiB
JavaScript
///#source 1 1 /src/1.0.0/load.js
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/*! head.load - v1.0.3 */
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/*
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* HeadJS The only script in your <HEAD>
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* Author Tero Piirainen (tipiirai)
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* Maintainer Robert Hoffmann (itechnology)
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* License MIT / http://bit.ly/mit-license
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* WebSite http://headjs.com
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*/
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(function (win, undefined) {
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"use strict";
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//#region variables
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var doc = win.document,
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domWaiters = [],
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handlers = {}, // user functions waiting for events
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assets = {}, // loadable items in various states
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isAsync = "async" in doc.createElement("script") || "MozAppearance" in doc.documentElement.style || win.opera,
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isDomReady,
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/*** public API ***/
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headVar = win.head_conf && win.head_conf.head || "head",
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api = win[headVar] = (win[headVar] || function () { api.ready.apply(null, arguments); }),
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// states
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PRELOADING = 1,
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PRELOADED = 2,
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LOADING = 3,
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LOADED = 4;
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//#endregion
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//#region PRIVATE functions
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//#region Helper functions
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function noop() {
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// does nothing
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}
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function each(arr, callback) {
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if (!arr) {
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return;
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}
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// arguments special type
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if (typeof arr === "object") {
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arr = [].slice.call(arr);
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}
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// do the job
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for (var i = 0, l = arr.length; i < l; i++) {
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callback.call(arr, arr[i], i);
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}
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}
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/* A must read: http://bonsaiden.github.com/JavaScript-Garden
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************************************************************/
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function is(type, obj) {
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var clas = Object.prototype.toString.call(obj).slice(8, -1);
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return obj !== undefined && obj !== null && clas === type;
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}
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function isFunction(item) {
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return is("Function", item);
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}
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function isArray(item) {
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return is("Array", item);
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}
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function toLabel(url) {
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///<summary>Converts a url to a file label</summary>
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var items = url.split("/"),
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name = items[items.length - 1],
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i = name.indexOf("?");
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return i !== -1 ? name.substring(0, i) : name;
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}
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// INFO: this look like a "im triggering callbacks all over the place, but only wanna run it one time function" ..should try to make everything work without it if possible
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// INFO: Even better. Look into promises/defered's like jQuery is doing
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function one(callback) {
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///<summary>Execute a callback only once</summary>
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callback = callback || noop;
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if (callback._done) {
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return;
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}
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callback();
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callback._done = 1;
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}
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//#endregion
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function conditional(test, success, failure, callback) {
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///<summary>
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/// INFO: use cases:
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/// head.test(condition, null , "file.NOk" , callback);
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/// head.test(condition, "fileOk.js", null , callback);
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/// head.test(condition, "fileOk.js", "file.NOk" , callback);
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/// head.test(condition, "fileOk.js", ["file.NOk", "file.NOk"], callback);
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/// head.test({
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/// test : condition,
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/// success : [{ label1: "file1Ok.js" }, { label2: "file2Ok.js" }],
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/// failure : [{ label1: "file1NOk.js" }, { label2: "file2NOk.js" }],
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/// callback: callback
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/// );
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/// head.test({
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/// test : condition,
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/// success : ["file1Ok.js" , "file2Ok.js"],
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/// failure : ["file1NOk.js", "file2NOk.js"],
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/// callback: callback
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/// );
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///</summary>
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var obj = (typeof test === "object") ? test : {
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test: test,
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success: !!success ? isArray(success) ? success : [success] : false,
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failure: !!failure ? isArray(failure) ? failure : [failure] : false,
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callback: callback || noop
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};
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// Test Passed ?
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var passed = !!obj.test;
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// Do we have a success case
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if (passed && !!obj.success) {
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obj.success.push(obj.callback);
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api.load.apply(null, obj.success);
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}
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// Do we have a fail case
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else if (!passed && !!obj.failure) {
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obj.failure.push(obj.callback);
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api.load.apply(null, obj.failure);
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}
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else {
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callback();
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}
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return api;
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}
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function getAsset(item) {
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///<summary>
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/// Assets are in the form of
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/// {
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/// name : label,
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/// url : url,
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/// state: state
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/// }
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///</summary>
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var asset = {};
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if (typeof item === "object") {
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for (var label in item) {
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if (!!item[label]) {
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asset = {
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name: label,
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url : item[label]
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};
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}
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}
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}
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else {
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asset = {
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name: toLabel(item),
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url : item
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};
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}
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// is the item already existant
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var existing = assets[asset.name];
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if (existing && existing.url === asset.url) {
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return existing;
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}
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assets[asset.name] = asset;
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return asset;
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}
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function allLoaded(items) {
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items = items || assets;
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for (var name in items) {
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if (items.hasOwnProperty(name) && items[name].state !== LOADED) {
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return false;
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}
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}
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return true;
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}
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function onPreload(asset) {
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asset.state = PRELOADED;
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each(asset.onpreload, function (afterPreload) {
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afterPreload.call();
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});
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}
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function preLoad(asset, callback) {
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if (asset.state === undefined) {
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asset.state = PRELOADING;
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asset.onpreload = [];
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loadAsset({ url: asset.url, type: "cache" }, function () {
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onPreload(asset);
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});
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}
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}
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function apiLoadHack() {
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/// <summary>preload with text/cache hack
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///
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/// head.load("http://domain.com/file.js","http://domain.com/file.js", callBack)
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/// head.load(["http://domain.com/file.js","http://domain.com/file.js"], callBack)
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/// head.load({ label1: "http://domain.com/file.js" }, { label2: "http://domain.com/file.js" }, callBack)
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/// head.load([{ label1: "http://domain.com/file.js" }, { label2: "http://domain.com/file.js" }], callBack)
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/// </summary>
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var args = arguments,
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callback = args[args.length - 1],
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rest = [].slice.call(args, 1),
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next = rest[0];
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if (!isFunction(callback)) {
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callback = null;
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}
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// if array, repush as args
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if (isArray(args[0])) {
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args[0].push(callback);
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api.load.apply(null, args[0]);
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return api;
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}
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// multiple arguments
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if (!!next) {
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/* Preload with text/cache hack (not good!)
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* http://blog.getify.com/on-script-loaders/
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* http://www.nczonline.net/blog/2010/12/21/thoughts-on-script-loaders/
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* If caching is not configured correctly on the server, then items could load twice !
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*************************************************************************************/
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each(rest, function (item) {
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// item is not a callback or empty string
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if (!isFunction(item) && !!item) {
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preLoad(getAsset(item));
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}
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});
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// execute
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load(getAsset(args[0]), isFunction(next) ? next : function () {
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api.load.apply(null, rest);
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});
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}
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else {
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// single item
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load(getAsset(args[0]));
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}
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return api;
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}
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function apiLoadAsync() {
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///<summary>
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/// simply load and let browser take care of ordering
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///
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/// head.load("http://domain.com/file.js","http://domain.com/file.js", callBack)
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/// head.load(["http://domain.com/file.js","http://domain.com/file.js"], callBack)
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/// head.load({ label1: "http://domain.com/file.js" }, { label2: "http://domain.com/file.js" }, callBack)
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/// head.load([{ label1: "http://domain.com/file.js" }, { label2: "http://domain.com/file.js" }], callBack)
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///</summary>
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var args = arguments,
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callback = args[args.length - 1],
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items = {};
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if (!isFunction(callback)) {
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callback = null;
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}
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// if array, repush as args
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if (isArray(args[0])) {
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args[0].push(callback);
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api.load.apply(null, args[0]);
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return api;
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}
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// JRH 262#issuecomment-26288601
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// First populate the items array.
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// When allLoaded is called, all items will be populated.
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// Issue when lazy loaded, the callback can execute early.
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each(args, function (item, i) {
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if (item !== callback) {
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item = getAsset(item);
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items[item.name] = item;
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}
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});
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each(args, function (item, i) {
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if (item !== callback) {
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item = getAsset(item);
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load(item, function () {
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if (allLoaded(items)) {
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one(callback);
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}
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});
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}
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});
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return api;
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}
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function load(asset, callback) {
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///<summary>Used with normal loading logic</summary>
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callback = callback || noop;
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if (asset.state === LOADED) {
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callback();
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return;
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}
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// INFO: why would we trigger a ready event when its not really loaded yet ?
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if (asset.state === LOADING) {
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api.ready(asset.name, callback);
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return;
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}
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if (asset.state === PRELOADING) {
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asset.onpreload.push(function () {
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load(asset, callback);
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});
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return;
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}
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asset.state = LOADING;
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loadAsset(asset, function () {
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asset.state = LOADED;
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callback();
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// handlers for this asset
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each(handlers[asset.name], function (fn) {
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one(fn);
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});
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// dom is ready & no assets are queued for loading
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// INFO: shouldn't we be doing the same test above ?
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if (isDomReady && allLoaded()) {
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each(handlers.ALL, function (fn) {
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one(fn);
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});
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}
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});
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}
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function getExtension(url) {
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url = url || "";
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var items = url.split("?")[0].split(".");
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return items[items.length-1].toLowerCase();
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}
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/* Parts inspired from: https://github.com/cujojs/curl
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******************************************************/
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function loadAsset(asset, callback) {
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callback = callback || noop;
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function error(event) {
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event = event || win.event;
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// release event listeners
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ele.onload = ele.onreadystatechange = ele.onerror = null;
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// do callback
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callback();
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// need some more detailed error handling here
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}
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function process(event) {
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event = event || win.event;
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// IE 7/8 (2 events on 1st load)
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// 1) event.type = readystatechange, s.readyState = loading
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// 2) event.type = readystatechange, s.readyState = loaded
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// IE 7/8 (1 event on reload)
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// 1) event.type = readystatechange, s.readyState = complete
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// event.type === 'readystatechange' && /loaded|complete/.test(s.readyState)
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// IE 9 (3 events on 1st load)
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// 1) event.type = readystatechange, s.readyState = loading
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// 2) event.type = readystatechange, s.readyState = loaded
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// 3) event.type = load , s.readyState = loaded
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// IE 9 (2 events on reload)
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// 1) event.type = readystatechange, s.readyState = complete
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// 2) event.type = load , s.readyState = complete
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// event.type === 'load' && /loaded|complete/.test(s.readyState)
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// event.type === 'readystatechange' && /loaded|complete/.test(s.readyState)
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// IE 10 (3 events on 1st load)
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// 1) event.type = readystatechange, s.readyState = loading
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// 2) event.type = load , s.readyState = complete
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// 3) event.type = readystatechange, s.readyState = loaded
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// IE 10 (3 events on reload)
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// 1) event.type = readystatechange, s.readyState = loaded
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// 2) event.type = load , s.readyState = complete
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// 3) event.type = readystatechange, s.readyState = complete
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// event.type === 'load' && /loaded|complete/.test(s.readyState)
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// event.type === 'readystatechange' && /complete/.test(s.readyState)
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// Other Browsers (1 event on 1st load)
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// 1) event.type = load, s.readyState = undefined
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// Other Browsers (1 event on reload)
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// 1) event.type = load, s.readyState = undefined
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// event.type == 'load' && s.readyState = undefined
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// !doc.documentMode is for IE6/7, IE8+ have documentMode
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if (event.type === "load" || (/loaded|complete/.test(ele.readyState) && (!doc.documentMode || doc.documentMode < 9))) {
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// remove timeouts
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win.clearTimeout(asset.errorTimeout);
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win.clearTimeout(asset.cssTimeout);
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// release event listeners
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ele.onload = ele.onreadystatechange = ele.onerror = null;
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// do callback
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callback();
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}
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}
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function isCssLoaded() {
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// should we test again ? 20 retries = 5secs ..after that, the callback will be triggered by the error handler at 7secs
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if (asset.state !== LOADED && asset.cssRetries <= 20) {
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// loop through stylesheets
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for (var i = 0, l = doc.styleSheets.length; i < l; i++) {
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// do we have a match ?
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// we need to tests agains ele.href and not asset.url, because a local file will be assigned the full http path on a link element
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if (doc.styleSheets[i].href === ele.href) {
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process({ "type": "load" });
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return;
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}
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}
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// increment & try again
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asset.cssRetries++;
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asset.cssTimeout = win.setTimeout(isCssLoaded, 250);
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}
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}
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var ele;
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var ext = getExtension(asset.url);
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if (ext === "css") {
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ele = doc.createElement("link");
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ele.type = "text/" + (asset.type || "css");
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ele.rel = "stylesheet";
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ele.href = asset.url;
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/* onload supported for CSS on unsupported browsers
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* Safari windows 5.1.7, FF < 10
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*/
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// Set counter to zero
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asset.cssRetries = 0;
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asset.cssTimeout = win.setTimeout(isCssLoaded, 500);
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}
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else {
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ele = doc.createElement("script");
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ele.type = "text/" + (asset.type || "javascript");
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ele.src = asset.url;
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}
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ele.onload = ele.onreadystatechange = process;
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ele.onerror = error;
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/* Good read, but doesn't give much hope !
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* http://blog.getify.com/on-script-loaders/
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* http://www.nczonline.net/blog/2010/12/21/thoughts-on-script-loaders/
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* https://hacks.mozilla.org/2009/06/defer/
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*/
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// ASYNC: load in parallel and execute as soon as possible
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ele.async = false;
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// DEFER: load in parallel but maintain execution order
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ele.defer = false;
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// timout for asset loading
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asset.errorTimeout = win.setTimeout(function () {
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error({ type: "timeout" });
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}, 7e3);
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// use insertBefore to keep IE from throwing Operation Aborted (thx Bryan Forbes!)
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var head = doc.head || doc.getElementsByTagName("head")[0];
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// but insert at end of head, because otherwise if it is a stylesheet, it will not override values
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head.insertBefore(ele, head.lastChild);
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}
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/* Parts inspired from: https://github.com/jrburke/requirejs
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************************************************************/
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function init() {
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var items = doc.getElementsByTagName("script");
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// look for a script with a data-head-init attribute
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for (var i = 0, l = items.length; i < l; i++) {
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var dataMain = items[i].getAttribute("data-headjs-load");
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if (!!dataMain) {
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api.load(dataMain);
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return;
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}
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}
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}
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function ready(key, callback) {
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///<summary>
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/// INFO: use cases:
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/// head.ready(callBack);
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/// head.ready(document , callBack);
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/// head.ready("file.js", callBack);
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/// head.ready("label" , callBack);
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/// head.ready(["label1", "label2"], callback);
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///</summary>
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// DOM ready check: head.ready(document, function() { });
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if (key === doc) {
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if (isDomReady) {
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one(callback);
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}
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else {
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domWaiters.push(callback);
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}
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return api;
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}
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// shift arguments
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if (isFunction(key)) {
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callback = key;
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key = "ALL"; // holds all callbacks that where added without labels: ready(callBack)
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}
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// queue all items from key and return. The callback will be executed if all items from key are already loaded.
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|
if (isArray(key)) {
|
|
var items = {};
|
|
|
|
each(key, function (item) {
|
|
items[item] = assets[item];
|
|
|
|
api.ready(item, function() {
|
|
if (allLoaded(items)) {
|
|
one(callback);
|
|
}
|
|
});
|
|
});
|
|
|
|
return api;
|
|
}
|
|
|
|
// make sure arguments are sane
|
|
if (typeof key !== "string" || !isFunction(callback)) {
|
|
return api;
|
|
}
|
|
|
|
// this can also be called when we trigger events based on filenames & labels
|
|
var asset = assets[key];
|
|
|
|
// item already loaded --> execute and return
|
|
if (asset && asset.state === LOADED || key === "ALL" && allLoaded() && isDomReady) {
|
|
one(callback);
|
|
return api;
|
|
}
|
|
|
|
var arr = handlers[key];
|
|
if (!arr) {
|
|
arr = handlers[key] = [callback];
|
|
}
|
|
else {
|
|
arr.push(callback);
|
|
}
|
|
|
|
return api;
|
|
}
|
|
|
|
/* Mix of stuff from jQuery & IEContentLoaded
|
|
* http://dev.w3.org/html5/spec/the-end.html#the-end
|
|
***************************************************/
|
|
function domReady() {
|
|
// Make sure body exists, at least, in case IE gets a little overzealous (jQuery ticket #5443).
|
|
if (!doc.body) {
|
|
// let's not get nasty by setting a timeout too small.. (loop mania guaranteed if assets are queued)
|
|
win.clearTimeout(api.readyTimeout);
|
|
api.readyTimeout = win.setTimeout(domReady, 50);
|
|
return;
|
|
}
|
|
|
|
if (!isDomReady) {
|
|
isDomReady = true;
|
|
|
|
init();
|
|
each(domWaiters, function (fn) {
|
|
one(fn);
|
|
});
|
|
}
|
|
}
|
|
|
|
function domContentLoaded() {
|
|
// W3C
|
|
if (doc.addEventListener) {
|
|
doc.removeEventListener("DOMContentLoaded", domContentLoaded, false);
|
|
domReady();
|
|
}
|
|
|
|
// IE
|
|
else if (doc.readyState === "complete") {
|
|
// we're here because readyState === "complete" in oldIE
|
|
// which is good enough for us to call the dom ready!
|
|
doc.detachEvent("onreadystatechange", domContentLoaded);
|
|
domReady();
|
|
}
|
|
}
|
|
|
|
// Catch cases where ready() is called after the browser event has already occurred.
|
|
// we once tried to use readyState "interactive" here, but it caused issues like the one
|
|
// discovered by ChrisS here: http://bugs.jquery.com/ticket/12282#comment:15
|
|
if (doc.readyState === "complete") {
|
|
domReady();
|
|
}
|
|
|
|
// W3C
|
|
else if (doc.addEventListener) {
|
|
doc.addEventListener("DOMContentLoaded", domContentLoaded, false);
|
|
|
|
// A fallback to window.onload, that will always work
|
|
win.addEventListener("load", domReady, false);
|
|
}
|
|
|
|
// IE
|
|
else {
|
|
// Ensure firing before onload, maybe late but safe also for iframes
|
|
doc.attachEvent("onreadystatechange", domContentLoaded);
|
|
|
|
// A fallback to window.onload, that will always work
|
|
win.attachEvent("onload", domReady);
|
|
|
|
// If IE and not a frame
|
|
// continually check to see if the document is ready
|
|
var top = false;
|
|
|
|
try {
|
|
top = !win.frameElement && doc.documentElement;
|
|
} catch (e) { }
|
|
|
|
if (top && top.doScroll) {
|
|
(function doScrollCheck() {
|
|
if (!isDomReady) {
|
|
try {
|
|
// Use the trick by Diego Perini
|
|
// http://javascript.nwbox.com/IEContentLoaded/
|
|
top.doScroll("left");
|
|
} catch (error) {
|
|
// let's not get nasty by setting a timeout too small.. (loop mania guaranteed if assets are queued)
|
|
win.clearTimeout(api.readyTimeout);
|
|
api.readyTimeout = win.setTimeout(doScrollCheck, 50);
|
|
return;
|
|
}
|
|
|
|
// and execute any waiting functions
|
|
domReady();
|
|
}
|
|
}());
|
|
}
|
|
}
|
|
//#endregion
|
|
|
|
//#region Public Exports
|
|
// INFO: determine which method to use for loading
|
|
api.load = api.js = isAsync ? apiLoadAsync : apiLoadHack;
|
|
api.test = conditional;
|
|
api.ready = ready;
|
|
//#endregion
|
|
|
|
//#region INIT
|
|
// perform this when DOM is ready
|
|
api.ready(doc, function () {
|
|
if (allLoaded()) {
|
|
each(handlers.ALL, function (callback) {
|
|
one(callback);
|
|
});
|
|
}
|
|
|
|
if (api.feature) {
|
|
api.feature("domloaded", true);
|
|
}
|
|
});
|
|
//#endregion
|
|
}(window));
|