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

[Roald de Wit]

Hi David,

David Martin wrote:
> 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.
>   
I'm in a similar situation: I need to solve the problem pretty much 
immediately with no time for a clean and well tested patch and will go 
with the try/catch method you described. Assuming you did as you 
described below: put the construction around the whole contents of 
'getMousePosition', there is no need for a copy of the mod. Thanks anyway!

Cheers, Roald
> 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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>>
>>
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>>
>>
>>                      itbeyond_david
>>
>>
>>
>> ______________________________________________________________________
>>
>>    Check out our websites: www.ExplorOz.com and www.itbeyond.com.au
>>
>>
>> ______________________________________________________________________
>>     
> --
> Roald de Wit
> Software Engineer
> roald.dewit at lisasoft.com
>
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