[Users] Tree, gx_layer and KML

[Andreas Hocevar]

Christian Spanring wrote:
> On Nov 15, 2009, at 9:14 AM, Eric Lemoine wrote:
>
>   
>> On Sunday, November 15, 2009, Fabien <fabien.goblet at gmail.com> wrote:
>>     
>>> You're right !
>>>       
>> providing a reference to the layer should work equally (layer:sundials
>> in place of layer:"sundials")
>>     
>
> I never got references to work in layer trees. When trying to do so, the script crashes/hangs my browser (Firefox, Safari) immediately (incl. Firebug, which doesn't give me any hint about the problem). I just reproduced that issue by adding a new layer to the GeoExt tree example and referencing it as "gx_layer" in the "treeConfig" layer tree.
>   
That example shows how to configure a tree with pure JSON, and this is
why references do not work here:

var treeConfig = new OpenLayers.Format.JSON().write([...], true);
...
        root: {
            nodeType: "async",
            // the children property of an Ext.tree.AsyncTreeNode is used to
            // provide an initial set of layer nodes. We use the treeConfig
            // from above, that we created with OpenLayers.Format.JSON.write.
            children: Ext.decode(treeConfig)
        },


If you want to use references, you have to configure your tree in JavaScript, not JSON:

var treeConfig = [...];
...
        root: {
            nodeType: "async",
            // the children property of an Ext.tree.AsyncTreeNode is used to
            // provide an initial set of layer nodes. We use the treeConfig
            // from above.
            children: treeConfig
        },

This will of course break on-the-fly editing of the tree configuration.

Regards,
Andreas.


-- 
Andreas Hocevar
OpenGeo - http://opengeo.org/
Expert service straight from the developers.