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    <p>I wholeheartedly agree that too many inline closure functions don't enhance readability. On the other hand I strongly dislike the <code>var self = this</code> style of writing closures, to which <code>this</code> is just a variant, as it's still too verbose in its declaration, and you introduce your own new 'keyword' whether that is <code>this</code> or <code>self</code>.</p> <p>What you want is to curry/bind the method.</p> <pre><code>function $A(o) { var a = []; for (var i = 0; i &lt; o.length; ++i) a.push(o[i]); return a; } Function.prototype.bind = function() { var _method = this; var a = $A(arguments) var o = a.shift(); return function() { return _method.apply(o, a.concat($A(arguments))); } } Function.prototype.curry = function() { var _method = this; var a = $A(arguments); return function() { return _method.apply(null, a.concat($A(arguments))); } } </code></pre> <p>The methods are taken from the <a href="http://en.wikipedia.org/wiki/Prototype_JavaScript_Framework" rel="nofollow noreferrer">Prototype</a> library. I use these even in projects that don't use the Prototype library as they are very useful!</p> <p>In your case this means instead of writing:</p> <pre><code>var This = this; oRequest.onreadystatechange = function() { This.handleResponse(oRequest, sUsername) } </code></pre> <p>you can now write:</p> <pre><code>oRequest.onreadystatechange = this.handleResponse.curry(oRequest,sUsername); </code></pre> <p>However if you want to transfer the meaning of the this keyword you could do this</p> <pre><code>oRequest.onreadystatechange = this.handleResponse.bind(this,oRequest,sUsername); </code></pre> <p><code>handleResponse</code>, when called, will have the same <code>this</code> context as the <code>submitHandler</code>.</p>
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    1. POBased on how they are constructed, can callbacks also be defined as closures?
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    1. USPeter Mortensen
    1. USMartijn Laarman
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