Re: calling abort method on XMLHttpRequest instance fires onreadystatechange with readyState 4

Boris Zbarsky wrote:

> See in particular 
> https://bugzilla.mozilla.org/show_bug.cgi?id=218236#c11 for comparisons 
> to IE 6.0 behavior.  Note the inconsistency in IE behavior depending on 
> the value of readyState when abort() is called (1 and 2 give different 
> behavior).

I have played with variations of my test case, this variation
<http://home.arcor.de/martin.honnen/mozillaBugs/XMLHttpRequest/abortChangesReadyState4ProgramIdDelay.html>
which only calls abort using setTimeout with a configurable delay indeed 
consistently for abort called on
   readyState 1
   program id Microsoft.XMLHTTP, Msxml2.XMLHTTP, Msxml2.XMLHTTP.3.0
   delay 10 milliseconds
shows readystatechange events as
   1 -> 1 -> 4
the abort sets readyState to 0 (and does that twice due to 1 -> 1 
transition).

Those program ids above are all bound to MSXML 3 on my system, if I run 
the same test with program ids for MSXML 4 or MSXML 5 or MSXML 6 however 
the sequence is simply
   1
then abort is called and it sets readyState to 0.

MSXML 3 is what is installed with IE 6, the other MSXML versions are not 
necessarily around to be used on the client.




-- 

	Martin Honnen
	http://JavaScript.FAQTs.com/