#3757 JavaScript errors when scrolling page in IE

[Charles Reilly]

In the IE advanced options ensure that "Disable
script debugging (Internet Explorer)" is NOT checked
(i.e. debugging is enabled).

Open any article (e.g. this one
http://slashdot.org/article.pl?sid=06/08/29/0127221\).

Scroll the page. A message box appears saying "A
runtime error has occurred. Do you wish to debug?
Line: 399 Error: Object required". The line number
varies.

The error occurs in this function:

function d2act ()
{
Position.prepare(); var xy = Position.cumulativeOffset
($('commentwrap')); var gd=($('d2act')); xy[1] = xy
[1] - Position.deltaY;

if (xy[1] < -14) {gd.style.top='4px';
gd.style.position='fixed'; gd.style.left='1em';}else
{gd.style.display='inline';
gd.style.position='fixed'; gd.style.top=xy[1] + 'px';
gd.style.left='1em'; };
}

This error has only started happening today. It
doesn't happen on the slashdot front page.

I could work around this by disabling script
debugging, but I need to use script debugging.

[Ben Del Vacchio]

Logged In: YES
user_id=1357101

This is also happening in Safari 2.0.4 on OS X 10.4.7.

It appears the window.onscroll event handler is being assigned the d2act
function on the line before this function is defined. Moving this assignment
below the function, or simply changing to 'window.onscroll = function()
{ Position..." should correct the issue.

[HeroHog]

Logged In: YES
user_id=1105917

This Does NOT occour if I go stright to /. via
http://www.slashdot.org. It happens when I follow a link
from the RSS feed: http://rss.slashdot.org/Slashdot/slashdot

The MS debugger shows the offending line as:
if (xy[1] < -14) {gd.style.top='4px';
gd.style.position='fixed'; gd.style.left='1em';}else
{gd.style.display='inline'; gd.style.position='fixed';
gd.style.top=xy[1] + 'px'; gd.style.left='1em'; };

OS: XP-Pro
Browser: IE7 Release Candidate 1.
Dual Monitors
Primary Resolution: 1600x1200
Secondary Resolution: 800x600
Font: Medium Default

Screenshot available at:
http://www.herohog.com/images/misc/slashdoterror.jpg

[Jehan Bing]

Logged In: YES
user_id=132894

This happens in Firefox 1.5.0.6 too.

Also, when several windows are open on slashdot pages,
scrolling is really slow (doesn't happens with tabs). Maybe
it's because of the Firebug extension which displays the JS
error count in the status bar, value that gets refreshed in
all the windows.

[Erik Funkenbusch]

Logged In: YES
user_id=804370

This is *REALLY* annoying. It makes it almost unusable. I
recommend this be moved to a much higher priority. Why
don't all developers have javascript debugging turned on?
This would be so easy to detect before rolling it out to
production.

[danielrcollins]

Logged In: YES
user_id=1590819

New here, also reported as bug [ 1552341 ].

In MS Script Debugger, it specifically highlights the
line "gd.style.display='inline'" in the block pointed out
above.

[danielrcollins]

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user_id=1590819

I'll just add that this bug makes Slashdot news pages
entirely unusable in IE as long as it persists.

[Charles Reilly]

Logged In: YES
user_id=352851

This has been fixed for me. (IE6 in XP SP2.)

[Jehan Bing]

Logged In: YES
user_id=132894

Yes, it's fixed for me too