[Users] group layer in a tree

[Matt Priour]

basically you want to use an overlay layer container and configure its 
filter function to snag the layers of interest
here is an example of a layer tree item configuration object you could use.

{
    nodeType: "gx_overlaylayercontainer",
    text: 'Medicago Layers',
    expanded: true,
    loader: {
        filter: function(rec){
            return (rec.get('layer').styleMap == 'style1');
            }
    }
}

Matt Priour

--------------------------------------------------
From: "François Boussuges" <f.boussuges at gmail.com>
Sent: Wednesday, June 23, 2010 6:35 AM
To: <users at geoext.org>
Subject: [Users] group layer in a tree

> Hello.
> I have a little problem with the layer tree:
>
> I have three layers :
> var medicago_site_co = new OpenLayers.Layer.Vector(
>            "Medicago site de collecte",{
>                strategies : [ new OpenLayers.Strategy.BBOX(),
>                               new OpenLayers.Strategy.Fixed()
>                ],
>                protocol: new OpenLayers.Protocol.HTTP(
>                        {url : "/geoserver/wfs?",
>                            params: {format:"WFS",
>                            service: "WFS",
>                            version: "1.0.0",
>                            request: "GetFeature",
>                            typename: "MEDICAGO_SITE_COLLECTE",
>                            SRS: "EPSG:4326"},
>                            format : new OpenLayers.Format.GML()
>                        }),
>
>                        geometryName : "GEOMETRY",
>                        visibility: false,
>                        styleMap: style1
>
>            });
>    var medicago_site_or = new OpenLayers.Layer.Vector(
>            "Medicago site d origine",{
>                strategies : [ new OpenLayers.Strategy.BBOX(),
>                               new OpenLayers.Strategy.Fixed()
>                ],
>                protocol: new OpenLayers.Protocol.HTTP(
>                        {url : "/geoserver/wfs?",
>                            params: {format:"WFS",
>                            service: "WFS",
>                            version: "1.0.0",
>                            request: "GetFeature",
>                            typename: "MEDICAGO_SITE_ORIGINE",
>                            SRS: "EPSG:4326"},
>                            format : new OpenLayers.Format.GML()
>                        }),
>
>                        geometryName : "GEOMETRY",
>                        visibility: false,
>                        styleMap: style1
>
>            });
>    var medicago_site_se = new OpenLayers.Layer.Vector(
>            "Medicago site de selection",{
>                strategies : [ new OpenLayers.Strategy.BBOX(),
>                               new OpenLayers.Strategy.Fixed()
>                ],
>                protocol: new OpenLayers.Protocol.HTTP(
>                        {url : "/geoserver/wfs?",
>                            params: {format:"WFS",
>                            service: "WFS",
>                            version: "1.0.0",
>                            request: "GetFeature",
>                            typename: "MEDICAGO_SITE_SELECTION",
>                            SRS: "EPSG:4326"},
>                            format : new OpenLayers.Format.GML()
>                        }),
>
>                        geometryName : "GEOMETRY",
>                        visibility: false,
>                        styleMap: style1
>
>            });
>
> I want to group this layer in a same layer group but I don't find the
> solution, I Geoext demo the layer group is WMS layers, have you a 
> solution?
>
> Thank
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