65337 - Event onmouseOver is fired twice

Status: VERIFIED DUPLICATE of bug 32415

(Core :: DOM: UI Events & Focus Handling, defect)

Description

[HJ]

WinNT4 build 2001011220 (I didn't check Linux/mac)

Trying to find the real source for some other bugs I have already found out that
the onkeypress event is fired twice, in a very specific case. Now it looks the
same for the onmouseOver event, but this time in a very simple testcase. I will
attache a  testcase where you will see that this is true. This 'small' error is
causing other larger bugs, where users use there mouse and keyboard to navigate
a site.

Reproducible: always (or almost always)
1 - put your mouse on cell 1 (and don't move that)
2 - now you should see a message (the first one)
3 - use ENTER only to confirm that message
4 - now you should see a message (the second one)
5 - use ENTER only to confirm that message
6 - take the mouse off that cell
7 - now you should see a message (the third one)
8 - use ENTER only to confirm that message

If this didn't work the first time, just try another time. 
Question "Did you see function:unset?" because I'm not getting that kind of
message at all.
So, for some odd reason the onMouseOut event isn't fired at all, or did I miss
that one?

Comment 1

[HJ]

Attachment: Testcase/example

Comment 2

[Fabian Guisset]

Dup candidates : bug 24976 and bug 47436 (sorry didn't have time to query more
thoroughly)

Comment 3

[Jonathan S Abrams]

I see this on Mac OS 9.1 build ID 2001011208.  Marking new, changing platform
and os to all, nominating mozilla1.0.

Comment 4

[HJ]

This bug blocks image rollovers and other nice web stuff.

Comment 5

[joki (gone)]

There are a series of things happening here.

First, the double firing isn't really a double firing, its just event bubbling.
 The mouse is moving from the page to the cell (event 1) and from the cell to
the text Node (event 2).  event 2 will go the the text Node but it also bubbles
up to the cell.  If you only want the mouseovers for the cell look compare
event.target with the cell object.  There is a bug open for errors in 4.x
content due to event bubbling (bug 14692) but new content is expected to handle
bubbling correctly.

Next, the mouseouts are not being fired because the alert is eating them.  This
is a valid bug.  I have a duplicate of it, bug 32415.  Still not sure how we
plan to fix this one.

Third, when I removed the alerts to just test via the color changes I noted that
the color change updates are kind of wacked.  The first one seems to work fine
but the other two appear not to change, though if you force the window to update
you can see they have changed.  I'm not sure what would cause that.  If you
continue to run into the color change problem I'd suggest filing a layout bug
for it.  I'm going to mark this bug as a dupe of 32415.

*** This bug has been marked as a duplicate of 32415 ***

Comment 6

[Hixie (not reading bugmail)]

Reassigning QA Contact for all open and unverified bugs previously under Lorca's
care to Gerardo as per phone conversation this morning.

Comment 7

[Madhur Bhatia]

QA contact updated

Comment 8

[Madhur Bhatia]

verified dup