[OpenLayers-Users] How to show "nothing" when a tile is not found with TileCache

Jay Douillard jay.douillard at ubc.ca
Tue Jun 23 12:08:03 EDT 2009

OpenLayers.Util.onImageLoadErrorColor = "transparent";

----- Original Message -----
From: "Linde Ackermans" <roselinda.ackermans at ec.europa.eu>
To: users at openlayers.org
Sent: Tuesday, June 23, 2009 6:00:41 AM GMT -08:00 US/Canada Pacific
Subject: [OpenLayers-Users] How to show "nothing" when a tile is not found with TileCache

Hi all,

I defined my layers with OpenLayers.TileCache

	var l1= new OpenLayers.Layer.TileCache("xxx", 
             {scales: Scales, resolutions: Resolutions,
              buffer:0, format:"image/png", isBaseLayer:false},

Say I have a base layer l0, extent = europe.
I want to overlay l1, but this layer only contains detailed information on
capital cities, on a very high scale.
I do not want to make a cache for layer l1 for the whole extent of the base
layer ( would be too much ), but only for a few selected rectangles.
How can I do this ? How can I show "nothing" for tiles not found ? ( Or an
empty tile which is transparent ? )
Thanks for any help.

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