52786 - [CHK]checkbox.checked returns wrong (or there's time delay in displaying updated checkbox?)

Status: VERIFIED FIXED

(Core :: DOM: Core & HTML, defect, P3)

Description

[Federico Sasso]

From Bugzilla Helper:
BuildID:    2000061311

after an onClick event over a checkbox, the checkbox state is not updated 
straight away, so that the associated script cannot read the correct .checked 
property, and reads instead its opposite state


Reproducible: Always

Steps to Reproduce:

1. create a form like this:

<form name="f12">
<input type="checkbox" onClick="setEntry('f12')" name="theCheck" />
</form>

2. add in the head section this function:

function setEntry(aFormName) //string
{
  var aForm = document.forms[aFormName];
  var aCheck = aForm.theCheck;
  alert(aCheck.checked);
}

3. click on the checkbox

Comment 1

[Cyril Bortolato]

WFM with Linux 2000-09-16-06.
Reporter, your build is old, please try with a more recent one.

Comment 2

[Cyril Bortolato]

Attachment: Entering provided testcase into bugzilla as an attachment

Comment 3

[Jesse Ruderman]

wfm windows 98 2000091508

Comment 4

[Stephen Walker]

marking worksforme with the 2000092308 nightly on win2k

Comment 5

[Vladimir Ermakov]

Updating QA contact.

Comment 6

[Vladimir Ermakov]

Hmm.. I dont know. The way it works for me is:
--Check box looks unchecked --
1) I click.
2) Alert pops up saying it is checked.
3) I dismiss the alert
-- Check box looks checked --

I think that the check box should be either checked before onclick event handler
is called  - at the same time as "true" value is assigned or shouldn't be
assigned "true" value untill the checkbox looks checked.

Comment 7

[Vladimir Ermakov]

... This was behaviour on Windows 98 build 2000-09-26-08-M18
On Linux RedHat6.2 build 2000-09-27-08-M18 you dont have to dismiss the alert
box to see the change but there is a 1/2 second delay.

Comment 8

[rods (gone)]

Although the dialog does have correct value, with IE and Nav the checkbox has a 
check in it when the dialog appears, in Moz it doesn't show a check until the 
dialog is dimissed. Futuring for to be fixed in next release.

Comment 9

[ekrock's old account (dead)]

Testing this on WinNT 4.0 SP4 using Commercial 2000091805, I'm not seeing the 
JavaScript alert display the wrong value. What I'm seeing is that the alert 
displays the correct, post-change value, even though the box's visual display 
hasn't updated yet. So this seems to be a cosmetic issue about the speed at 
which the visual appearance is being updated rather than the DOM returning the 
wrong value (which would be more serious). Or is the problem specific to a 
single platform?

For now, it seems appropriate to Future this. If JavaScript were clearly 
returning the wrong value, that would be a much more serious concern. If the 
issue is now (or always was) simply the speed of updating the visual appearance, 
the summary should be changed to reflect this.

Comment 10

[ekrock's old account (dead)]

I got this update message from Federico by email. Federico, the Mozilla build 
you're using is older than the Commercial build I used by about a month. Could 
you please retest using a recent Mozilla daily build on Win2000 so we can figure 
out whether:
a) I'm not seeing the bug because it's Win2k-specific
b) I'm not seeing the bug because it's been fixed since the build you used
Also, please post all updates about bugs directly in the bug report 
itself so it's archived for all to see. Thanks!

sorry for disturbing you, but I wish to point out that on W2000
Professional, with M17 milestone built (Built ID: 2000080712) the alert DOES
display the result wrong, so it is not just a cosmetic issue, but it is much
more serious.
Moz doesn't show a check until the dialog is dimissed, axactly as Rods
wrote.

in the test case,
http://bugzilla.mozilla.org/showattachment.cgi?attach_id=14867
clicking twice on the checkbox, with M17 I get 'false', then 'true',
while IE, for example,  correctly reports 'true', and then 'false'

hope this could help,
best regards

      Federico Sasso

Comment 11

[Federico Sasso]

btw, it now works for me with build 2000101014 and W2000 (even if Moz it 
doesn't show a check until the dialog is dimissed)

Comment 12

[rods (gone)]

this is now fixed as part of a different checkin

Comment 13

[Vladimir Ermakov]

Verifying on 2000-01-12-04-Mtrunk