[Users] LegendPanel fires GetLegendGraphic requests for invisible Layers

[Just van den Broecke]

Hi,

I plan to add it via the GeoExt GitHub:
- opening an issue on GeoExt
- cloning and making changes to LegendPanel.js
- review and apply for a pull with GeoExt developers

Hopefully will find time for this next week but is on my agenda.

best,

Just
On 07-06-12 13:10, Thomas Colley wrote:
> Hi Just
>
> I have looked at applying your modifications to GeoExt but have not
> managed it.
>
> Are you planning to add it to the GeoExt GitHub and if not could you
> possibly help with the code that needs to be altered in LegendPanel.js?
>
> Many thanks
>
> Tom
>
> -----Original Message-----
> From: users-bounces at geoext.org [mailto:users-bounces at geoext.org] On
> Behalf Of Just van den Broecke
> Sent: 24 May 2012 09:56
> To: users at geoext.org
> Subject: Re: [Users] LegendPanel fires GetLegendGraphic requests for
> invisible Layers
>
> Hi,
>
> I got much further in nailing down the issue: GeoExt will
> prefetch/preload Legends, WMS Legends via GetLegendGraphic, for all
> Layers where the "hideInLegend" record item is false/undefined, thus
> even if the Layer is not visible.
>
> I have fixed this and made this behaviour configurable via a
> "prefetchLegends" property for my class that derives from GeoExt
> LegendPanel. Also "hideInLegend" gets set in a Layer record when set for
> a Layer.
>
> See the code at:
> http://code.google.com/p/geoext-viewer/source/browse/trunk/heron/lib/wid
> gets/LayerLegendPanel.js
> (Heron MC is a framework on top of GeoExt). Maybe the fix can be cleaned
> some, but for now this works. If found useful I may add this fix/feature
> to GeoExt via GitHub pull.
>
> best,
>
> --Just
> Just van den Broecke
> The Netherlands
> www.justobjects.nl
>
>
>
> On 22-05-12 19:48, Just van den Broecke wrote:
>> Hi,
>>
>> Another Legend issue, on GeoExt 1.1/OpenLayers 2.11:
>>
>> When I add a LegendPanel to a Container, GetLegendGraphic requests are
>
>> issued for every WMS Layer, even if these Layers are initially
>> invisible. Basically the same issue as described here:
>> http://lists.osgeo.org/pipermail/geoprisma-dev/2010-October/000487.htm
>> l For maps with many layers this gives quite some init delay.
>>
>> I would like to show/hide legends dynamically, only for Layers that
>> become visible/invisible, possibly as a configurable option
>> ("showVisibleLayersOnly") on LegendPanel. I could not find an open
>> issue or maybe there is a workaround. Thanks for any suggestions.
>> Best,
>>
>> --Just
>>
>> Just van den Broecke
>> The Netherlands
>> www.justobjects.nl
>>
>>
>>
>>
>>
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>
>
>
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