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BOOK: Professional Ajax ISBN: 978-0-471-77778-6
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Old June 17th, 2006, 01:51 PM
AGS AGS is offline
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Default XMLHttpRequest asyncronous by default?

Hi,

Frankly speaking I was sure until recently that default value for third parameter of XMLHttpRequest.open() method is true for all browsers that support XMLHttpRequest object. But verifying some code today I've realized suddenly that Firefox request is synchronous by default. Rather unexpected discovery. I wonder what the reason was to implement it this way taking into account that W3C Working Draft states that this parameter is defaulting to true if omitted?

Alexei

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Old June 17th, 2006, 03:49 PM
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You have to remember that IE invented XMLHttp and Mozilla just duplicated its efforts. The fact that it's now going through a working draft at W3C doesn't mean that that is the way it *should* be.

My guess is that Firefox is using the old tried and true method of considering a null or undefined argument to be false (!!null or !!undefined).

Nicholas C. Zakas
Author, Professional JavaScript for Web Developers (ISBN 0764579088)
http://www.nczonline.net/
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Old June 17th, 2006, 04:44 PM
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I just meant that there would be far less troubles for developers if such "duplications" were literal until respective standard emerged.



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