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Re: [xmlhttprequest2] timeout and JSON

From: Jonas Sicking <jonas@sicking.cc>
Date: Thu, 11 Sep 2008 20:31:41 -0700
Message-ID: <48C9E29D.9010100@sicking.cc>
To: Sunava Dutta <sunavad@windows.microsoft.com>
CC: Anne van Kesteren <annevk@opera.com>, WebApps WG <public-webapps@w3.org>, Gideon Cohn <gidco@windows.microsoft.com>, Zhenbin Xu <Zhenbin.Xu@microsoft.com>, IE8 Core AJAX SWAT Team <ieajax@microsoft.com>

Sunava Dutta wrote:
> " I absolutely agree that it would rock if we could use
>> the MS implementation."
> 
> Thanks Jonas. As always, appreciated.
> 
> Answers to your question
>>> What happens if there is a timeout in that state?
>>>
>>> 1) .readystate is set to 0
>>>    .status is set to 0
>>>    .responseXML is set to null
>>>    .responseText is set to ""
>>> 2) All properties are left as is.
>>> 3) Something else  (Profit?)
> 
> Essentially, timeout has the effect that is similar to 1). Infact, design wise is intended to have the same effect although a few superficial differences exist.
> What 1) seems to ask for is resetting the object, which is what IE8 does. Readystate is set to 0, there are a few differences in IE's (8 and legacy) support for the existing XHR syntax, and those are reflected in the values of the properties when they are accessed in readystate 0 and corresponding exceptions thrown. Any changes to a future release of IE to bring those inline with the XHR spec would remedy the differences.
> These are:
> When ontimeout fires:
> 
> •       Getting responseText throws an exception:  “The data necessary to complete this operation is not yet available”
> •       Getting responseXML throws an exception:  “Unspecified error.”
> •       Getting status throws an exception:  “Unspecified error.”

Ah, so it sounds like timing out behaves very similarly to abort() being 
called? Does onreadystatechange fire since readystate changes to 0? And 
does this happen before or after ontimeout is fired?

I guess IE doesn't have an abort event on the XHR object (is this 
correct?) so the relation between ontimeout and onabort is undefined as 
far as the IE implementation goes.

/ Jonas
Received on Friday, 12 September 2008 03:33:44 GMT

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