Unselect all layers and clear the legend in Openlayers

Question

Is the there a way of clearing the legend in Openlayers by unselecting all the layers? We have a map that starts with several layers.

I was thinking that we might be able to add a button to the map that would do this.

Answer 1

You could use some JavaScript like the following:

 for(var i=0;i<map.layers.length;i++) {
    if (!map.layers[i].isBaseLayer)
      map.layers[i].setVisibility(false)
 }

This will disable all layers except base layers. The legend (LayerSwitcher) will be updated automatically.