383304 - Onreadystatechange doesn't fire when XHR is used in synchronous mode

Status: RESOLVED DUPLICATE of bug 313646

(Firefox :: General, defect)

Description

[Chris Bloom]

User-Agent:       Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.4) Gecko/20070515 Firefox/2.0.0.4

When using an XHR object in a synchronous fashion, the onreadystatechange event is never fired. Many AJAX frameworks/libraries depend on this functionality, so it should always fire.

Note that having the Firebug extension installed causes the XHR object to behave as expected.

Reproducible: Always

Steps to Reproduce:
See http://www.csb7.com/test/xhr_ff_orsc_bug/ for examples and link to another description of the problem.

Comment 1

[Subbu Allamaraju]

This bug makes Firefox non-conformant with XMLHttpRequest as is currently drafted.

Any thoughts on fixing this?

Comment 3

[bugzilla33]

confirm on FF 3.0.1


<script>

  r=new XMLHttpRequest()
  r.onreadystatechange=function(){if(r.readyState==4)alert(r.responseText)}
  r.open('GET','1.txt',false)
  r.send(null)

</script>