[Users] Layer group with legend

[Andreas Hocevar]

Hi Alexandre,

see comments inline.

On Oct 19, 2010, at 15:25 , Alexandre Dube wrote:

> One thing at a time.  First, mixing the tree-legend and 
> LayerParamLoader.  I don't really get how I'm suppose to assemble the 
> elements.  So far, I modified the tree-legend example and tried [1] but 
> it triggers a javascript error...

You are calling the wrong superclass. You need
GeoExt.tree.LayerParamLoader.prototype.createNode.call(this, attr);

> Secondly, I about my other "group" node level thing, I'm not sure if 
> that's currently possible with the current elements unless I create the 
> nodes manually, am I right ?

You could use a LayerLoader with a filter for each of your groups. At least that's what I hear other people do.

Regards,
Andreas.

> 
> Thanks for any pointer,
> 
> Alexandre
> 
> 
> [1] ==================================
> 
>     var mapPanel = new GeoExt.MapPanel({
>         region: "center",
>         center: [146.1569825, -41.6109735],
>         zoom: 6,
>         layers: [
>             new OpenLayers.Layer.WMS("Tasmania",
>                 "http://demo.opengeo.org/geoserver/wms", {
>                     layers: 
> "topp:tasmania_state_boundaries,topp:tasmania_water_bodies,topp:tasmania_roads,topp:tasmania_cities"
>                 }, {
>                     buffer: 0,
>                     isBaseLayer: false
>                })
>         ]
>     });
> 
>     var tree = new Ext.tree.TreePanel({
>         region: "east",
>         title: "Layers",
>         width: 250,
>         autoScroll: true,
>         enableDD: true,
>         // apply the tree node component plugin to layer nodes
>         plugins: [{
>             ptype: "gx_treenodecomponent"
>         }],
>         loader: {
>             applyLoader: false,
>             uiProviders: {
>                 "custom_ui": LayerNodeUI
>             }
>         },
>         root: {
>             nodeType: "gx_layer",
>             layer: "Tasmania",
>             isLeaf: false,
>             loader: {
>                 param: "LAYERS",
>                 baseAttrs: {
>                     uiProvider: "custom_ui"
>                 },
>                 createNode: function(attr) {
>                     // add a WMS legend to each node created
>                     attr.component = {
>                         xtype: "gx_wmslegend",
>                         layerRecord: 
> mapPanel.layers.getByLayer(attr.layer),
>                         showTitle: false,
>                         // custom class for css positioning
>                         // see tree-legend.html
>                         cls: "legend"
>                     }
>                     return 
> GeoExt.tree.LayerLoader.prototype.createNode.call(this, attr);
>                     }
>             }
>         },
>         rootVisible: true,
>         lines: false
>     });
> 
> 
> 
> 
> On 10-10-19 08:15 AM, Alexandre Dube wrote:
>> Hi Andreas,
>> 
>>    Thanks for your reply.  I little more detail wouldn't hurt if it's
>> not asking for too much.
>> 
>>    Also, I'd like to add one thing in my tree : groups.  I already have
>> the name of the group each server-side layer has and I'd like to add a
>> level of nodes for that :
>> 
>>    [x] Group1
>>      [x] Layer1
>>        (img) Class1
>>        (img) Class2
>>       [x] Layer2
>>         (img) Class1
>>     [ ] Group2
>>       [ ] Layer3
>>       [ ] Layer4
>>       [x] Layer5
>> 
>> and so on using one single OpenLayers.Layer.WMS object.  Is that
>> possible too ?
>> 
>> Thanks,
>> 
>> Alexandre
>> 
>> 
>> On 10-10-18 04:53 PM, Andreas Hocevar wrote:
>> 
>>> Hi Alexandre,
>>> 
>>> this is definitely possible. All you need to do is configure your LayerParamLoader with a custom createNode function that creates an appropriate LayerLegend instance. Pretty much the same as in the tree-legend.html example.
>>> 
>>> Does this answer your question or do you need more details?
>>> 
>>> Regards,
>>> Andreas.
>>> 
>>> On Oct 18, 2010, at 22:02 , Alexandre Dube wrote:
>>> 
>>> 
>>> 
>>>> Hi,
>>>> 
>>>>    Is it possible to use a "group layer" as shown in this example [1]
>>>> with each "param/layer" generated node having its own "legend" node [2]
>>>> ?  I would like to have one OpenLayers.WMS object in the end.  Is that
>>>> possible with the current GeoExt legend and tree features available ?
>>>> 
>>>>    Thanks,
>>>> 
>>>> [1] http://api.geoext.org/1.0/examples/tree.html
>>>> [2] http://api.geoext.org/1.0/examples/tree-legend.html
>>>> 
>>>> -- 
>>>> Alexandre Dubé
>>>> Mapgears
>>>> www.mapgears.com
>>>> 
>>>> _______________________________________________
>>>> Users mailing list
>>>> Users at geoext.org
>>>> http://www.geoext.org/cgi-bin/mailman/listinfo/users
>>>> 
>>>> 
>>> 
>>> 
>>> 
>> 
>> 
> 
> 
> -- 
> Alexandre Dubé
> Mapgears
> www.mapgears.com
> 
> _______________________________________________
> Users mailing list
> Users at geoext.org
> http://www.geoext.org/cgi-bin/mailman/listinfo/users



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