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July 22, 2021 14:47
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| // ### Ready | |
| // | |
| // This module provides a convenient way to register | |
| // a callback when the document is ready. The callback | |
| // is called immediately if the document is ready | |
| // when the module's API is called. | |
| // | |
| // > This really shouldn't be necessary as a library | |
| // module, but IE10 and below have a nasty bug in how | |
| // they report `document.readyState`. The workaround | |
| // is pretty kludgy, so better to keep it confined | |
| // to one bit of code instead of letting it proliferate. | |
| // | |
| // API: | |
| // | |
| // - `Intellum.util.ready(callback)` registers | |
| // a callback function. | |
| ;(function(document, window) { | |
| 'use strict'; | |
| // Use the `Intellum.util` namespace. | |
| window.Intellum = window.Intellum || {}; | |
| window.Intellum.util = window.Intellum.util || {}; | |
| // State variables for all instances | |
| var isHandlerInstalled = false, | |
| callbacks = []; | |
| window.Intellum.util.ready = (function(callback) { | |
| // A local event handler | |
| function documentIsReady() { | |
| // Now that the document is ready, we | |
| // can remove our event handlers. | |
| document.removeEventListener("DOMContentLoaded", documentIsReady); | |
| window.removeEventListener("load", documentIsReady); | |
| isHandlerInstalled = false; | |
| // Trigger any callbacks | |
| callbacks.forEach(function(callback) { | |
| callback(); | |
| }); | |
| // Make sure we don't trigger any | |
| // callback more than once. | |
| callbacks = []; | |
| } | |
| // Original jQuery code to workaround the IE bug: | |
| // https://github.com/jquery/jquery/pull/901 | |
| // We're pretty much doing the same thing. | |
| // The `doScroll` method was proprietary | |
| // to Internet Explorer and removed in IE11. | |
| // https://msdn.microsoft.com/en-us/library/ms536414(v=vs.85).aspx | |
| if ( document.readyState === "complete" || | |
| (document.readyState !== "loading" && | |
| !document.documentElement.doScroll) ) { | |
| // Trigger the callback at the end of the | |
| // execution stack in case any caller | |
| // is doing something funky that would | |
| // cause a race condition, i.e. if they're | |
| // not completely ready for the callback. | |
| window.setTimeout(callback, 0); | |
| } else { | |
| // The document isn't ready yet, so | |
| // remember this callback. | |
| callbacks.push(callback); | |
| // Have we installed our own ready state | |
| // handler yet? If not, we'll need to | |
| // do so now. | |
| if (!isHandlerInstalled) { | |
| // Only do this once. | |
| isHandlerInstalled = true; | |
| // The best event to use is "DOMContentLoaded" | |
| document.addEventListener("DOMContentLoaded", documentIsReady); | |
| // But just in case that event is funky | |
| // (might be in some browsers), also use | |
| // the "load" event as a fallback. | |
| window.addEventListener("load", documentIsReady); | |
| } | |
| } | |
| }); | |
| })(window.document, window); |
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