275413 - onchange event handler gets called twice

Status: RESOLVED DUPLICATE of bug 254238

(Core :: DOM: Events, defect)

Description

[Daniel Brooks [:db48x]]

This page works fine in FF 1.0, but not in recent Mozilla or FF trunk builds.
Using Venkman, I noticed that the event handler is being called twice. I could
expect that to happen if the code modified the state of the checkbox, but in
this case it doesn't.

Comment 1

[Brendan Eich [:brendan]]

This is unlikely to be a JavaScript Engine bug.  Why did you assign it that way?
 Bouncing to DOM events.

/be

Comment 2

[Mats Palmgren (inactive)]

Most likely the same underlying problem as in bug 254238.
Please make a small testcase and attach it here in case the page changes...

Comment 3

[Daniel Brooks [:db48x]]

Attachment: backtrace for each call to the event handler

I notice that in frame 12, aFlags is 1 the first time and 513 the second, so
the second call is for the system load group (as PresShell::HandleEventInternal
says). I didn't look look too much further, so I don't know why the second call
to HandleDOMEvent also called the event handler. I probably ought to make a
reduced testcase as well.

Comment 4

[Daniel Brooks [:db48x]]

Thought I'd dup'd this already. Anyway, the patch in the other bug fixes it.

*** This bug has been marked as a duplicate of 254238 ***