[OpenLayers-Dev] Exception in OpenLayers.Layer.Grid.removeBackBuffer

[Andreas Hocevar]

Hey,

@Eric: after looking more, I see that OpenLayers.Layer::clone puts all
properties from the original on the clone:

        // catch any randomly tagged-on properties
        OpenLayers.Util.applyDefaults(obj, this);

This is also the reason why we manually create a new grid in Layer.WMS::clone.

@Tim: can you please try to apply the following patch and see if it
fixes the issue?

----------
diff --git a/lib/OpenLayers/Layer/Grid.js b/lib/OpenLayers/Layer/Grid.js
index adf5163..b8e5bd4 100644
--- a/lib/OpenLayers/Layer/Grid.js
+++ b/lib/OpenLayers/Layer/Grid.js
@@ -317,6 +317,8 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HT
         // we do not want to copy reference to grid, so we make a new array
         obj.grid = [];
         obj.gridResolution = null;
+        // same for the backbuffer
+        obj.backBuffer = null;

         return obj;
     },
----------

Thanks,
Andreas.

On Wed, Mar 14, 2012 at 8:28 AM, Eric Lemoine
<eric.lemoine at camptocamp.com> wrote:
> On Wed, Mar 14, 2012 at 8:08 AM, Andreas Hocevar <ahocevar at opengeo.org> wrote:
>> The only occasions I could think of that could potentially make
>> this.backBuffer both non-null and not a child of this.div is when a
>> layer is cloned during tile loading
>
> I had thought about this too. But I'm still failing to understand how
> cloning can lead to this state. Do you mind elaborating a bit? Thank
> you.
>
>
> --
> Eric Lemoine
>
> Camptocamp France SAS
> Savoie Technolac, BP 352
> 73377 Le Bourget du Lac, Cedex
>
> Tel : 00 33 4 79 44 44 96
> Mail : eric.lemoine at camptocamp.com
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-- 
Andreas Hocevar
OpenGeo - http://opengeo.org/
Expert service straight from the developers.