[OpenLayers-Users] Dependent layers in overlay of LayerSwitcher

[Arnd Wippermann]

Register the event "changelayer"

     *  - *changelayer* triggered after a layer name change, order change,
or
     *      visibility change (due to resolution thresholds).  Listeners
will
     *      receive an event object with *layer* and *property* properties.
The
     *      *layer* property will be a reference to the changed layer.  The
     *      *property* property will be a key to the changed property (name,
     *      visibility, or order).


And use something like this:

    map.events.register("changelayer", map, function (e) {
        if(e.layer.name==map.layers[1].name)
        {
            map.layers[4].setVisibility(e.layer.visibility);
        }
        else if(e.layer.name==map.layers[2].name)
        {
            map.layers[5].setVisibility(e.layer.visibility);
        }
        else if(e.layer.name==map.layers[3].name)
        {
            map.layers[6].setVisibility(e.layer.visibility);
        }
    });

Or

    map.events.register("changelayer", map, function (e) {
        for(var i=1;i<4;i++)
            if(e.layer.name==map.layers[i].name)
                map.layers[i+3].setVisibility(e.layer.visibility);
    });

You don't need to modify the layerswitcher.

Arnd Wippermann 

-----Ursprüngliche Nachricht-----
Von: users-bounces at openlayers.org [mailto:users-bounces at openlayers.org] Im
Auftrag von S.Reena
Gesendet: Samstag, 11. Oktober 2008 10:19
An: users at openlayers.org
Betreff: [OpenLayers-Users] Dependent layers in overlay of LayerSwitcher


Hi,

I have made Overlay so that it consists on 7 layers..last three not being
shown in LayerSwitcher. I want that if I uncheck layer 2...layer 5 shud also
disappear from map same for layers (3,6) and (4,7). I modified the
LayerSwitcher like this:  


 updateMap: function() {

        // set the newly selected base layer
        for(var i=0; i < this.baseLayers.length; i++) {
            var layerEntry = this.baseLayers[i];
            if (layerEntry.inputElem.checked) {
                this.map.setBaseLayer(layerEntry.layer, false);
            }
        }

        // set the correct visibilities for the overlays
        for(var i=0; i < this.dataLayers.length; i++) {
           // alert(i);
            var layerEntry = this.dataLayers[i];
            layerEntry.layer.setVisibility(layerEntry.inputElem.checked);
        // Added By Reena
                if((i==1)&& (layerEntry.layer.visibility==false))
                {
                        var layerEntry1 = this.dataLayers[5];
                        layerEntry1.layer.setVisibility(false);
                }

                 if((i==2)&& (layerEntry.layer.visibility==false))
                {
                        var layerEntry1 = this.dataLayers[6];
                        layerEntry1.layer.setVisibility(false);
                }
                 if ((i==3)&& (layerEntry.layer.visibility==false))
                {
                        var layerEntry1 = this.dataLayers[7];
                        layerEntry1.layer.setVisibility(false);
                }


        }

    },
..................

The problem is that if I dont show the last three layers in LayerSwitcher
...its not working ...but if I do then it is....the value of 'i' is not
incrementing till the last layer but to the displayed layer only.
The layers I have made is like this
--------------------------------------
 wms[5] = new OpenLayers.Layer.WMS.Untiled(
                  "
label","http://gis.rtbi-iitm.in/cgi-bin/mapserv?map=/var/www/html/v1/mapfile
/dist_label.map",
                   {'layers':
"TN_District",'transparent':"true"},{'displayInLayerSwitcher':true},{'isBase
Layer':false});

         wms[6] = new OpenLayers.Layer.WMS.Untiled(
                  "
label","http://gis.rtbi-iitm.in/cgi-bin/mapserv?map=/var/www/html/v1/mapfile
/taluk_label.map",
                   {'layers':
"Tnd_Taluk",'transparent':"true"},{'displayInLayerSwitcher':true},{'isBaseLa
yer':false});

          wms[7] = new OpenLayers.Layer.WMS.Untiled(
                  "
label","http://gis.rtbi-iitm.in/cgi-bin/mapserv?map=/var/www/html/v1/mapfile
/vill_label.map",
                  
{'layers':"Tnd_Village",'transparent':"true"},{'displayInLayerSwitcher':true
},{'isBaseLayer':false});


-------------------------------------------

Can any1 help?

Cheers,
Reena.






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