212291 - JavaScript: onMouseOut processed before mouse click event is handled?

Status: RESOLVED DUPLICATE of bug 102578

(Core :: DOM: Events, defect)

Description

[Stephan Jaensch]

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.5a) Gecko/20030707 Mozilla Firebird/0.6
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.5a) Gecko/20030709

 

Reproducible: Always

Steps to Reproduce:
1. Go to the URL mentioned above. 
2. Hover with the mouse over the first menu entry 'Produkte'. A menu appears.
3. Click on any of the menu entries.

Actual Results:  
The menu disappears, but the URL from the link is not loaded.

Expected Results:  
The link should be loaded.

The code that matters is as follows:

<div id="produktbar" style="visibility: hidden;" onmouseover="showMenu();"
onmouseout="hideMenu();">
  <a href="http://www.intosite.de/frl/produkt.php?id=0"><b>Einbau-Downlights</b></a>
  <a href="http://www.intosite.de/frl/produkt.php?id=1">Aufbau-Downlights</a>
...

My wild and uneducated guess is that under Linux, the onmouseout event of the
parent div is processed before the mouse click is fully evaluated. Click on any
of the menu entries and hold down the mouse button. As soon as you click the
menu disappears (onmouseout event was processed). But link clicks are processed
AFTER you release the mouse button, just check on regular links. By that time
there is no link where you just clicked. Don't try to click on one of the lower
menu entries or you will accidentally load the link that is UNDER the menu!

This bug is not present under Windows (tested with a recent Firebird build as
well as IE6). It does occur under Linux with a current Mozilla nightly, a
self-compiled Firebird with Xft2 support and with Netscape 7.1.

Comment 1

[Stephan Jaensch]

Removing the onmouseout from the parent div lets you click the menu entries, but
obviously breaks the site as the menu will not disappear again once shown.

Comment 2

[Boris Zbarsky [:bzbarsky]]

What window manager are you using?  Some are known to send bogus mouseout events
on clicks..

Comment 3

[Stephan Jaensch]

I'm using kwin from KDE 3.1.1 as shipped with SuSE Linux 8.2. You're right, I
just tested with fvwm2 and everything works just fine. Do you know if this is
fixed in KDE 3.1.2 or in HEAD or do you know if there is a corresponding bug
filed in the KDE bug database? Is there anything else I can do to work around
this bug besides switching window managers?

Comment 4

[Boris Zbarsky [:bzbarsky]]

Not sure; I've cced blizzard because he's more familiar with the problem and may
have those answers....

Comment 5

[Andrew Schultz]

> Is there anything else I can do to work around this bug besides switching
window > managers?

switch to sloppy focus.
this is a dupe of bug 102578

Comment 6

[Boris Zbarsky [:bzbarsky]]

*** This bug has been marked as a duplicate of 102578 ***