[ka-Map-dev] [Bug 1439] New: _map.setLayerVisibility(layerName, false) doesn't work for layers not loaded

[bugzilla-daemon at bugzilla.maptools.org]

http://bugzilla.maptools.org/show_bug.cgi?id=1439

           Summary: _map.setLayerVisibility(layerName, false) doesn't work
                    for layers not loaded
           Product: ka-Map
           Version: 0.3
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: core
        AssignedTo: ka-map-dev at lists.maptools.org
        ReportedBy: tim at commenspace.org


Though it may seem a bit useless, I'd like to be able to set the layer
visibility of "unloaded" layers to false with _map.setLayerVisibility().  This
currently produces an error because the layer has no properties (or methods)
before being loaded.  To fix, it requires a check in _map.setLayerVisibility() like

_map.prototype.setLayerVisibility = function( name, bVisible ) {
    var layer = this.getLayer( name );
    if(typeof(layer) != 'undefined') {
        layer.setVisibility( bVisible );
    }
}; 

The same could be done to setLayerQueryable and setLayerOpacity.  Though it may
be hard to imagine a use case, I've had reson to loop through all layers (from a
mapfile) and turn them all off (not visible).  Note that this error is triggered
by calling kaMap.setLayerVisibility(someUnloadedLayer, false).  

I'll commit this change if nobody objects.



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