[OpenLayers-Users] Display WMS layer depending on ZoomLevel

[Arnd Wippermann]

Hi,
 
you have added minZoomLevel and maxZoomLevel to the params or your WMS
layer. params are used for building the WMS request. Move them to the
options of your WMS layer and perhaps it works. I use minScale and maxScale
to control the display of layers.
 
{  gutter:15,
   minZoomLevel : 5,
   maxZoomLevel : 10
   //minScale : 1000000,
   //maxScale : 45000
}

Arnd

  _____  

Von: users-bounces at openlayers.org [mailto:users-bounces at openlayers.org] Im
Auftrag von Paul Curran
Gesendet: Dienstag, 27. Oktober 2009 16:08
An: users at openlayers.org
Betreff: [OpenLayers-Users] Display WMS layer depending on ZoomLevel


Hello i need your help.
 
I currently have two layers. i would like to display one layer initially
then zoom in closer and display the second layer. I have been trying to do
it like this:
 
var options = { maxExtent: bounds, maxResolution: 600, numZoomLevels: 10};
 
layer1 = new OpenLayers.Layer.WMS("OpenLayers WMS", 
"http://127.0.0.1/cgi-bin/mapserv.exe?", { layers: "uk", map:
'/ms4w/apps/openlayers-2.5/data/uk2.map', 
minZoomLevel: 1, maxZoomLevel: 4 },
      { gutter: 15 });
 
 
layer2 = new OpenLayers.Layer.WMS("OpenLayers WMS",
"http://127.0.0.1/cgi-bin/mapserv.exe?", { layers: "UK250", map:
'/ms4w/apps/openlayers-2.5/data/uk2.map', 
minZoomLevel: 5, maxZoomLevel: 10},
      { gutter: 15 });
 
      map.addLayer(Layer1, Layer2);
      map.zoomToExtent(bounds);
      map.setCenter(bounds);
      map.zoomToMaxExtent();
 
My main problem is i can only display a layer when status is DEFAULT within
mapfile however i cannot hide the layer if set to this. When Set to ON the
layer is not displayed atall.
 
Any help much appreciated
 
Cheers
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