[Users] VectorLegend exception after removing layer

[frank]

Dear list

I'm using a self-made function for clearing all layers in my map and 
adding a stored set of predefined layers.
In this routine i call map.removeLayer() for all non-base layers, before 
I add the new layer set.

However, after having removed the layers I get an exception from 
GeoExt.VectorLegend:

1. Uncaught TypeError: Cannot read property 'map' of null
    1.
       GeoExt.VectorLegend.Ext.extend.onMapZoomVectorLegend.js:261
       
<http://localhost/barentswatch/GeoExt-1.1/lib/GeoExt/widgets/VectorLegend.js>
    2.
       OpenLayers.Events.OpenLayers.Class.triggerEventEvents.js:798
       <http://localhost/barentswatch/OpenLayers-2.11/lib/OpenLayers/Events.js>
    3.
       OpenLayers.Map.OpenLayers.Class.moveToMap.js:1890
       <http://localhost/barentswatch/OpenLayers-2.11/lib/OpenLayers/Map.js>
    4.
       OpenLayers.Map.OpenLayers.Class.setCenterMap.js:1662
       <http://localhost/barentswatch/OpenLayers-2.11/lib/OpenLayers/Map.js>
    5.
       
OpenLayers.Control.Navigation.OpenLayers.Class.wheelChangeNavigation.js:279
       
<http://localhost/barentswatch/OpenLayers-2.11/lib/OpenLayers/Control/Navigation.js>
    6.
       OpenLayers.Control.Navigation.OpenLayers.Class.wheelDownNavigation.js:303
       
<http://localhost/barentswatch/OpenLayers-2.11/lib/OpenLayers/Control/Navigation.js>
    7.
       OpenLayers.Handler.OpenLayers.Class.callbackHandler.js:205
       <http://localhost/barentswatch/OpenLayers-2.11/lib/OpenLayers/Handler.js>
    8.
       OpenLayers.Handler.MouseWheel.OpenLayers.Class.wheelZoomMouseWheel.js:229
       
<http://localhost/barentswatch/OpenLayers-2.11/lib/OpenLayers/Handler/MouseWheel.js>
    9.
       
OpenLayers.Handler.MouseWheel.OpenLayers.Class.onWheelEventMouseWheel.js:191
       
<http://localhost/barentswatch/OpenLayers-2.11/lib/OpenLayers/Handler/MouseWheel.js>
   10.
       (anonymous function)

To the inner level this maps down to the function
    onMapZoom: function() {
            this.setCurrentScaleDenominator(
                this.layer.map.getScale()
            );
    },

And by inspection this.layer is undefined.

How can this be?
Removing the layer with any combination of (one or both)
    map.removeLayer(layer) and
    layer.destroy()
gives the same result.

best regards,
Frank



_______________________________________________
Users mailing list
Users@geoext.org
http://www.geoext.org/cgi-bin/mailman/listinfo/users