I just wanted to add - I get the same exact error with my below code when
switching between themes and this is called each time. Sorry not much help in
terms of what causes it but just thought I would include another example that
gets the same error. I just exclude my base layers and add all other layers to
get this.
//Remove all map layers / turn off visibility of all layers
var num = (map.getNumLayers() -1);
while (num >= 0)
{
if (map.layers[num].name == 'Fake_Base' || map.layers[num].name == 'Overview
Map Layers')
{
//do nothing
}
else if (map.layers[num].name == 'redlines')
{
map.removeLayer(map.layers[num], false);
}
else
{
map.layers[num].setVisibility(false);
map.removeLayer(map.layers[num], false);
}
num -=1;
}
//Add new layers to map, refresh map panel
map.addLayers([layer_Google_Streets,layer_Google_Hybrid,
layer_Google_Satellite,layer_Orthos, layer_Base,layer_Parcel_Fabric,
layer_Legal_Fabric,layer_Footprints,layer_Trails,layer_AOIs,layer_Labels,vlayer]);
mapPanel.map = map;
________________________________
From: [email protected]
[mailto:[email protected]] On Behalf Of Mattias X
Gustafsson
Sent: December 20, 2010 2:41 AM
To: [email protected]
Subject: [OpenLayers-Users] "this.map is null" error after removing layer from
OpenLayers.Map
Hello,
We are getting a 'this.map is null' error, generated in openLayers.js, row
1156, when we remove a layer with OpenLayers.Map's removeLayer-function.
I include some code from where we register the zoom event. In the case where we
remove a layer due to current scale being lesser than the MINSCALE of the layer.
If needed I can provide more detailed/extensive code.
Two notions:
*If included, the console log 'test' gets written to Firebug console before the
error appears. So the problem is not generated exactly at the map.removeLayer
call, but it seem to be related.
*If we include the alert call (or step through the code with a debugger), the
error will appear at all.
At the moment the error does not affect the functionality of our code, it works
perfectly fine, but I still would appreciate some help in order to understand
why the error appear.
// 'map' is an instance of OpenLayers.Map
// 'Layers' contain our instances of OpenLayers.Layer
map.events.register("zoomend", map, function() {
for(var i in Layers){
var currentLayerName = Layers[i].mapLayer.name;
if (Layers[i].mapLayer.params.MINSCALE < map.getScale()) {
if (map.getLayersByName(currentLayerName).length == 0){
map.addLayer(Layers[i].mapLayer);
}
}
else if (map.getLayersByName(currentLayerName).length > 0) {
map.removeLayer(Layers[i].mapLayer);
//alert('test');
}
}
//console.log('test');
});
Best regards
Mattias Gustafsson
________________________________
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