[OpenLayers-Users] Javascript Error - ScrollWheel disabled - IE - scroll on map

[David Martin]

Roald,

No tidy solution - I have just left the try-catch solution in my production system and it seems to be working well. I do understand the problem and will work on it some more in due course. At the moment I am focused on many other projects however a major product update in one of my OpenLayers apps will be starting in about 4 weeks. I will get onto this error again then when I load up the latest build and start afresh.

Do you need a copy of the mod? I installed it directly in the single file build and could copy out the lines if you need it.

David

-----Original Message-----
From: Roald de Wit [mailto:roald.dewit at lisasoft.com] 
Sent: Tuesday, 3 February 2009 1:23 PM
To: David Martin
Cc: users
Subject: Re: [OpenLayers-Users] Javascript Error - ScrollWheel disabled - IE - scroll on map

Hi David,

Coincidentally, today I bumped into the same problem as you describe
below. Did you manage to find a solution or did you stick to the
workaround with the try-catch construction?

Do you feel like creating an issue in Trac [1] (with a simplified
example that can reproduce the error)?

Kind regards,

Roald

[1] http://trac.openlayers.org/wiki/FilingTickets

On Mon, 2008-12-22 at 11:50 +1030, David Martin wrote:
> I have been having an on-going problem with OL (using 2.7 and same in
> the trunk). The issue seems to only occur when using IE. If you
> disable the zoomWheel in the Navigation control and then load a
> Control.Click with an event script to capture clicks and mouse
> positions in a map. Show this map in IE and then scroll with the wheel
> over the map panel itself the browser throws a this.element.scrolls is
> null or not an object.
>
>
>
> I looked at the event script and I believe that during the
> getMousePosition function the evt is being destroyed with the
> this.clearMouseCache event (caused be scrolling using the wheel over
> the map). I know I am close because I wrapped the whole
> getMousePosition function is a try { { catch{} and the error has gone
> away. I would debug it further however I cannot use Firebug in IE as I
> do in Firefox. I also find that IE does not launch my debuggers
> correctly in this instance.
>
>
>
> I know it is killing the event (this) because if I comment out the
> this.element.scrolls section lines 777 – 783 the error is reported
> then against the this.element.lefttop. Is there a better solution?
>
>
>
> Regards
> David Martin
> Managing Director
> I.T. Beyond Pty Ltd
>
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> ______________________________________________________________________
>
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--
Roald de Wit
Software Engineer
roald.dewit at lisasoft.com

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