[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
2. OpenLayers.Events.OpenLayers.Class.triggerEventEvents.js:798
3. OpenLayers.Map.OpenLayers.Class.moveToMap.js:1890
4. OpenLayers.Map.OpenLayers.Class.setCenterMap.js:1662
5. OpenLayers.Control.Navigation.OpenLayers.Class.wheelChangeNavigation.js:279
6. OpenLayers.Control.Navigation.OpenLayers.Class.wheelDownNavigation.js:303
7. OpenLayers.Handler.OpenLayers.Class.callbackHandler.js:205
8. OpenLayers.Handler.MouseWheel.OpenLayers.Class.wheelZoomMouseWheel.js:229
9. OpenLayers.Handler.MouseWheel.OpenLayers.Class.onWheelEventMouseWheel.js:191
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

[Bart van den Eijnden]

Hi,

what version of GeoExt are you using? Please upgrade to 1.1 if you're not running it already.

This was fixed with: http://trac.geoext.org/ticket/451

Best regards,

Bart

-- 
Bart van den Eijnden
OpenGeo - http://opengeo.org
Expert service straight from the developers.

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[Andreas Hocevar]

Hi,

if your legend is auto-created from a MapPanel's layers store, this
should not happen. If you build your legend manually, you have to
delete a layer's legend before you destroy the layer.

Andreas.

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Andreas Hocevar
OpenGeo - http://opengeo.org/

Expert service straight from the developers.