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    <p>Normally, the <code>ready</code> event jQuery function is called like this</p> <pre><code>$(function() { /* ... */ }); // or jQuery(function() { /* ... */ }); // or jQuery(document).ready(function() { /* ... */ }); </code></pre> <p>Bottom line, the function is not given a particular context; the actual context given by jQuery to the function is the <code>HTMLDocument</code> element, regardless of the argument (in the last example, <code>document</code>). Why is this so is another subject. </p> <p>Generally, each of these functions are called later, after everything has been loaded, but not necessarily. In your case, there is a reference to <code>MyNameSpace</code> before the <code>ready</code> event happens. Even if Javascript is a <a href="http://en.wikipedia.org/wiki/LALR_parser" rel="nofollow noreferrer">LALR</a>-type language, and it will find the symbol declared later, this is not a good practice. What if <code>MyNameSpace</code> would be set to something else later on, before jQuery triggers the <code>ready</code> callback functions? Your <code>ready</code> callback would not get that new reference. Unless intentional, the reference should be made <em>inside</em> the <code>ready</code> callback, when everything is.... ready.</p> <p>Then, inside the <code>ready</code> callback, there are other techniques to assign a context to a function. <a href="https://stackoverflow.com/users/417562/lonesomeday">lonesomeday</a> have pretty much given the correct way to accomplish what you are trying to do.</p> <pre><code>(function() { // this == MyNamespace }).call(MyNamespace); </code></pre> <p>The above code executes an anonymous function right away, where <code>this == MyNameSpace</code></p> <p><strong>note</strong> : the difference between <em>apply</em> and <em>call</em> is decribed <a href="http://trephine.org/t/index.php?title=JavaScript_call_and_apply" rel="nofollow noreferrer">here</a></p> <p>Now, comes the bottom part of the code you provided :</p> <pre><code>//load the additional files that are needed and fire onReadyCallback MyNameSpace.Util.loadFiles(defaultJsFiles,function(){ MyNameSpace.Util.require(['My.App','My.Theme','My.DomHandler'], function(){ onReadyCallback.apply(window); }); }); </code></pre> <p>This is problematic, and unnecessary. Is the function <code>onReadyCallback</code> only needed there, or will it be called several times? If it needs to be called only once, spare the global namespace, and simply do :</p> <pre><code>//load the additional files that are needed and fire onReadyCallback MyNameSpace.Util.loadFiles(defaultJsFiles,function(){ MyNameSpace.Util.require(['My.App','My.Theme','My.DomHandler'], function(){ // if everything is done loading, the function will be executed, otherwise // it's execution will be postponed later jQuery(function() { // create our nicely wrapped anonymous function now (function() { if(!this.loggedIn()){ return; } // ...Lots of Code referring to MyNameSpace using "this" })(MyNameSpace); // grab our most recent reference of `MyNameSpace` }); }); }); </code></pre> <p>If you don't like the indentation (it's merely a developer's taste), replace everything in the <code>ready</code> callback with (something like) :</p> <pre><code> initMyNameSpace.apply(MyNameSpace); </code></pre> <p>and create your function outside, on the global space :</p> <pre><code> function initMyNameSpace() { if(!this.loggedIn()){ return; } // ...Lots of Code referring to MyNameSpace using "this" }; </code></pre> <p>But I would recommand, at least, to put it in the <code>require</code> callback function so it...</p> <ol> <li>...does not pollute the global namespace with a run-once function</li> <li>...is not accessible from anywhere (keep it private)</li> <li>...can be found quickly when editing the source code</li> <li>etc.</li> </ol> <p><strong>note</strong> : usually, <em>apply</em> and <em>call</em> are used to avoid repeatedly accessing objects like <code>some.thing.pretty.deep = value;</code> or when one function needs to be applied to many but not all objects, and thus extending the object's prototype is just not a good idea.</p> <p>This is my opinion anyway, and how I would do things, without any more knowledge of your code or what you are doing.</p>
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    1. POCalling jQuery document.ready handler with apply method?
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    1. USYanick Rochon
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    1. COThanks a lot for taking the time to write a detailed explanation, has some very useful points/tips... will certainly help deepen my understanding of this stuff.
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