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From: "Christoph M. Becker" <cmbecker69@arcor.de>
Newsgroups: comp.lang.javascript
Subject: Re: XMLHttpRequest and Google Chrome
Date: Mon, 13 Apr 2015 17:46:31 +0200
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Robbie Brown wrote:

> On 13/04/15 15:50, Ben Bacarisse wrote:
>> Robbie Brown <rob@example.com> writes:
>> <snip>
>>> there is a common header that is included with every page
>>>
>>> in the <head> of the common header I have this
>>>
>>> <script type="text/javascript">
>>>     window.onload=getCart();
>>> </script>
>>
>> This looks wrong.  Did you mean 'window.onload=getCart'?  The async HTTP
>> handler will run when there is no guarantee that the element it will
>> modify is present yet.
>
> But this doesn't work at all as I explained earlier.
> If I have a function called getCart() how does getCart call it?
> 
> Obviously I'm missing something here.
> 
> Can anyone put me out of my misery?

The onload property of the window element is supposed to hold the
reference to a Function object (or null).  This function object is
automatically called (with a single argument, namely the respective
Event object[1]) after the documented has been loaded.

In your case you're assigning the return value of getCart() to the
property.  The return value is undefined, and will be cast to null, so
no function will be called when the document has been loaded.

Instead getCart is called right before the assignment, which causes the
XHR to be triggered immediately.  The rest is timing dependend.

[1] This argument isn't supplied in old versions of MSHTML.

-- 
Christoph M. Becker