GeoExt 04b Layer Tree - Filtering

LayerContainer の LayerLoader はレイヤの保持と表示をします。
独自の filter 機能を loader に設定できます。
geoext02_layer-tree.html を修正します。

---
  <script type="text/javascript">
   var map, layer1, layer2, layer3, layer4, layer5, layer6, layer7;
   // Filtering 用にレイヤ追加

---

    layer4 = new OpenLayers.Layer.WMS( "Railroad JR Line WMS",
     "http://192.168.1.6/cgi-bin/mapserv?",
     {
      map: '/home/nob61/mapfile/tokyo_pf_pgis.map',
      layers: 'jrline',
      transparent: true,
      format: 'image/png'
     },{
      projection: new OpenLayers.Projection("EPSG:4326")
     }
    );

    layer5 = new OpenLayers.Layer.WMS( "Railroad Public Line WMS",
     "http://192.168.1.6/cgi-bin/mapserv?",
     {
      map: '/home/nob61/mapfile/tokyo_pf_pgis.map',
      layers: 'publicline',
      transparent: true,
      format: 'image/png'
     },{
      projection: new OpenLayers.Projection("EPSG:4326")
     }
    );

    layer6 = new OpenLayers.Layer.WMS( "Railroad Private Line WMS",
     "http://192.168.1.6/cgi-bin/mapserv?",
     {
      map: '/home/nob61/mapfile/tokyo_pf_pgis.map',
      layers: 'privateline',
      transparent: true,
      format: 'image/png'
     },{
      projection: new OpenLayers.Projection("EPSG:4326")
     }
    );

    layer7 = new OpenLayers.Layer.WMS( "Railroad Third Sector Line WMS",
     "http://192.168.1.6/cgi-bin/mapserv?",
     {
      map: '/home/nob61/mapfile/tokyo_pf_pgis.map',
      layers: 'thirdsec',
      transparent: true,
      format: 'image/png'
     },{
      projection: new OpenLayers.Projection("EPSG:4326")
     }
    );

    map.addLayers([layer1, layer2, layer3, layer4, layer5, layer6, layer7]);

---

    var layerList = new GeoExt.tree.LayerContainer({
     text: 'Raiload Layers',
     layerStore: mapPanel.layers,
     leaf: false,
     expanded: true,
     // 追加
     loader: {
      filter: function(record) {
       return record.get("layer").name.indexOf("Railroad") !== -1
       // OpenLayers.Layer.WMS の名前
      }
     }
     // ここまで
     });
---