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    <p>A couple things to note first. MS invented a sort of "clientside runtime object" called <a href="http://msdn.microsoft.com/en-us/library/bb310856(loband).aspx" rel="noreferrer"><code>Sys.Application</code></a>. It handles raising <code>init</code>, <code>load</code>, and <code>unload</code> events throughout the [clientside] lifespan of the page, as follows:</p> <ol> <li><a href="http://msdn.microsoft.com/en-us/library/bb311012(loband).aspx" rel="noreferrer"><code>Sys.Application.initialize()</code></a> begins the <code>init</code> part of the life cycle. This <code>initialize()</code>s all clientside AJAX controls, after which they're ready to be interacted with programatically</li> <li><code>Sys.Application</code> begins the <code>load</code> part of the life cycle, calling all handlers that have subscribed to this event</li> <li>Finally, it calls the global function <code>pageLoad</code> (if one is defined)</li> </ol> <p>Step 2) and 3) are repeated for every partial (ie AJAX + UpdatePanel) postback.</p> <p><strong>So finally the answer</strong>: <code>pageLoad</code> is just a handy shortcut to <a href="http://msdn.microsoft.com/en-us/library/bb383829(loband).aspx" rel="noreferrer"><code>Sys.Application.add_load()</code></a>.</p> <p>With regards to its relationship to <code>window.onload</code> however, things start to get interesting. Essentially, MS needed <code>window.onload</code> to fire only <em>after</em> the <code>init</code> phase was complete. But you can't control when the browser will fire <code>onload</code>, as it's tied to <em>"content loaded"</em>. This is known as <a href="http://dean.edwards.name/weblog/2005/09/busted/" rel="noreferrer">"the <code>window.onload</code> problem"</a>:</p> <blockquote> <p>onload event fires after all page content has loaded (including images and other binary content). If your page includes lots of images then you may see a noticeable lag before the page becomes active.</p> </blockquote> <p>So, they just invented their own "special" function to fire at just the right time in their event life cycle and called it <code>"pageLoad"</code>. And the trick that they used to kickoff this custom event life cycle was to <a href="http://msdn.microsoft.com/en-us/library/bb311012(loband).aspx" rel="noreferrer">place the call to <code>Sys.Application.initialize()</code> just before the closing <code>&lt;/form&gt;</code> tag</a>. The serverside runtime does this. Astute readers will note that this trick allowed MS to solve the <code>window.onload</code> problem, since any code you put into <code>pageLoad</code> will fire independent of binary content (<a href="http://seejoelprogram.wordpress.com/2008/06/08/when-sysapplicationinitialize-causes-operation-aborted-in-ie/" rel="noreferrer">w/ one rare catch for IE</a>).</p> <p><strong>&gt; Do they act the same?</strong></p> <p>Conceptually yes, in practice not at all due to said <code>window.onload</code> problem. The only rule is that you should put code that interacts with your AJAX controls in <code>pageLoad</code> only, since <code>window.onload</code> follows its own event trajectory.</p> <p><strong>&gt; Or is one called before the other?</strong></p> <p>They are completely, 100% independent.</p> <p><strong>&gt; Or will one be called automatically and the another not?</strong></p> <p>They will both be called if you have them defined.</p>
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    1. POWhat's the different between ASP.NET AJAX pageLoad() and JavaScript window.onload?
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    1. POWhat's the different between ASP.NET AJAX pageLoad() and JavaScript window.onload?
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    1. COyour answer is complete, but i have another issue with pageLoad, when i put in my page i found that it keep called and called automatically, note: i have telerik:RadAjaxManager on the page, so this is because of an error happening or its normal to keep called like that "as its called by a timer"?
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    2. COnice write up +1 - the </form> solution is so very laughably microsoft
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    3. CO@amrelgarhy: see my updated answer: Step 2) and 3) are called on every partial (ie AJAX + UpdatePanel) postback.
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