141073 - javascript function doesn't work in element beside an image if the page is scrolled down

Status: RESOLVED WORKSFORME

(Core :: DOM: Events, defect, P4)

Description

[Wolfgang Gruber]

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.0rc1) Gecko/20020417
BuildID:    2002041711

I have a page with a large image and two links on the left and right side of the
image. The links call a Javascript function, which opens an alert popup. When
you click on the link, the popup doesn't pop up. The window only moves a bit up
to the begin of the image. If you insert a <br> between the <a> and the <img>
the function works and the popup appears.

Reproducible: Always
Steps to Reproduce:
1. Open the url http://stud3.tuwien.ac.at/~e9725141/test.html
2. Click on the test links beside the image => no popup
3. Click on the test links above or below the image => alert popup appears

Expected Results:  The popup should always appear, no matter if the link is
beside, above or below the image

Comment 1

[Andrew Schultz]

seeing the same with Linux build 20020428

I think what you're seeing is related to the fact that Mozilla seems to scroll
such that the line that contains the link you clicked is on the screen. 
Unfortunately, it seems that this scrolling also breaks the JavaScript.

To see this, notice that the left/right test links work if you're already at the
top of the page.  Also the top/bottom tests don't work if the text is not fully
on the screen.

Comment 2

[Boris Zbarsky [:bzbarsky]]

To events.  This is a known problem -- the onfocus is fired first, then we
scroll, then we fire onclick to whatever is now under the pointer, which may no
longer be the link....

Comment 3

[Andrew Schultz]

*** Bug 156525 has been marked as a duplicate of this bug. ***

Comment 4

[Vladimir Ermakov]

This works for me on recent builds on Mac and Windows. Resolving works for me.
PS. I love the picture, if you are the one verifying this, you wont be sorry ;)

Comment 5

[OstGote!]

Bug 156525 still fails with Mozilla 1.3 alpha under Windows. Does the test case
work with recent builds? 

Comment 6

[Vladimir Ermakov]

Is this bug working for you? I also see that that bug is failing. Perhaps its
not a dupe after all.

Comment 7

[Andrew Schultz]

on both bugs, if you make the window small enough I see both bugs.

to reproduce this bug, make the window small enough that you get a scrollbar and
make sure that top of the first image is not in the window.  left-click on the
link next to the first image.  the window scrolls, but that's it.

Vladimir and ostgote: are you sure this bug is WFM?

Comment 8

[Vladimir Ermakov]

Ah, sorry. This doesnt work for me. I didnt see anything about scrolling down in
the steps...

Comment 9

[Vladimir Ermakov]

Doesnt sound like dom events, the issue is that the page scrolls up when the
link is pressed, and when mouse is release it is no longer on the link, so the
link never gets the click event. layout perhaps?

Comment 10

[John Keiser (jkeiser)]

I don't see this.  Here is what I do:
1. Make sure the window is small enough that a vertical scrollbar appears on the
right.
2. Click on the link to the right of the first picture.
3. A popup shows up.

It is my understanding that if this bug existed, #3 would not happen.

Maybe this was fixed in recent builds?  I have WinXP 2003012908.

Comment 11

[OstGote!]

This bug is not fixed. I've just tested in with 1.3b final on Win NT 4.0 again.

John: Are you sure the vertical scrollbar was not on top (see summary)? If the
scrollbar is on top your step 2 works but if the scrollbar is somewhere below it
doesn't work. The effect is only an upward scrolling, no alert.

Comment 12

[Andrew Schultz]

1. Make sure the window is small enough that a vertical scrollbar appears on the
right.
** 1.5.  scroll the first image at least partially off the top of the page.
2. Click on the link to the right of the first picture.
3. A popup shows up.

Comment 13

[John Keiser (jkeiser)]

Ah, thanks, now I see it too.

Comment 14

[John Keiser (jkeiser)]

Back to events, where it belongs.  bz's assessment of the situation is correct,
and you can see it if you hold the mouse down longer before you finish clicking.
 Hold the mouse down, the element is focused and the page moves to fit the
entire block; then when you mouse up, the mouse is no longer on the <a href> and
therefore the click does not happen (a click only happens if you mousedown and
mouseup on the same element).

The bug here could probably be fixed by fixing the code that scrolls to fit the
element; perhaps that code should only scroll to the top of the <a href>, not
the entire block including the img.  Then again, perhaps that would break
something ;)

Comment 15

[OstGote!]

Hmm ... this bug and bug 156525 now works for me.

Moz 1.7a build 2004021508 WinNT4.

Comment 16

[OstGote!]

(In reply to comment #15)
> Hmm ... this bug and bug 156525 now works for me.

WFM with Mozilla 1.7.3, Mozilla 1.8a4, and 1.8a5 build 2004101405 on WinNT4.
Could be closed?

Comment 17

[Andrew Schultz]

worksforme as well with linux trunk 2004101606