[OpenLayers-Users] add/remove layers from layerswitcher

[G. Allegri]

I've solved it. I needed to put this.displayInLayerSwitcher=true before
setVisibility(), as the layerswitch redraw chain checks that property and it
isn't set by the setVisibility() method (and that's right!).

Bye

2008/11/8 G. Allegri <giohappy at gmail.com>

> Hi.
> I know this is an old question, but I can't figure out why the usual method
> to add/remove layers from LayerSwitch on the base of zoom doesn't work for
> me.
>
> I have two layers:
>
>     GMLcomuni = new OpenLayers.Layer.GML("GMLcomuni","IET2.gml",
> {isBaseLayer:true,group:"base"});
>     GMLsezioni = new OpenLayers.Layer.GML("GMLsezioni","IET2.gml",
> {group:"base",maxResolution: 10,visibility:
> false,displayInLayerSwitcher:false});
>
>     map.addLayers([GMLcomuni,GMLsezioni]);
>     layerswitch = new OpenLayers.Control.LayerSwitcher();
>     map.addControl(layerswitch);
>     map.events.register("zoomend",GMLsezioni, function(){
>         if(map.resolution<10){
>             this.setVisibility(true);
>             //this.displayInLayerSwitcher=true;
>         }
>     });
>
> The setVisibility() method triggers both the changelayer and the visibilitychanged
> events, but the layerswitcher seems to ignore them, leaving only the first
> baselayer.
>  (and the layer get drawn on the map), but the layerswitcher control
> doesn't react. Debuggin with FB I've seen that the
> layerswitcher.checkRedraw() method returns false, so the redraw() returns
> nothin, but I've checked that layerswitch.layerStates[1].visibility
> property before and after setVisibility(), and they change so I would
> expect the checkRedraw to return true!. I'm a bit confused...
>
> Any hint?
>
> Giovanni
>
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