[OpenLayers-Users] Set map initial center and zoom

[Eric Lemoine]

On Friday, August 14, 2009, Raul David Orozco <hagen1113 at yahoo.com> wrote:
> I'm here again with mi newbie questions. I've been dealing with this issue for a long time and I can't fix it no matter how hard I try.I need to make OL set an initial coordinates and zoom so when I open the browser the map stars in some specific part of the world.
> I've done it perfectly with an example doing this:var options = {
>  			minResolution: "auto",
>  			minExtent: new OpenLayers.Bounds(-1, -1, 1, 1),
>  			maxResolution: "auto",
>  			maxExtent: new OpenLayers.Bounds(-180, -90, 180, 90)
>  		  };
>
>             map = new OpenLayers.Map( 'map' , options);
>
>
>             layer = new OpenLayers.Layer.WMS( "OpenLayers WMS",
>                     "http://labs.metacarta.com/wms/vmap0", {layers: 'basic'});
>             map.addLayer(layer);
>
>             map.setCenter(new OpenLayers.LonLat(-73, 3), 3);And it works just the way I want, but when I do this with my map:var options = {
>                             minResolution: "auto",
>                             minExtent: new OpenLayers.Bounds(-1, -1, 1, 1),
>                             maxResolution: "auto",
>                             maxExtent: new OpenLayers.Bounds(-180, -90, 180, 90)
>                  };
>
>            var map = new OpenLayers.Map( 'map' , options);
>
>
>  		var request = OpenLayers.Request.GET(
>  		{url: "dir/smms/wms.php?VERSION=1.1.1&REQUEST=GetCapabilities&SERVICE=WMS",
>  		success: function(response){
>  						var XMLformat = new OpenLayers.Format.XML();
> 			var xml = XMLformat.read(response.responseText);
>  						var CAPformat = new OpenLayers.Format.WMSCapabilities();
>  						var cap = CAPformat.read(xml);
>  					
>  						for (var i=0; i<cap.capability.layers.length; i++) {
>  							layer = cap.capability.layers[i];
>  										layers_array[i] = new OpenLayers.Layer.WMS( layer.name,
>                                             "dir/smms/wms.php",
>                                             {'layers': layer.name, format: "image/png"}
>                                             );
>  										 							
>  						
>  							map.addLayer(layers_array[i]);
>  						}
>  							},
>  			failure: function(response){
>  						alert(response.status);
>  						alert("GetCapabilities failed");
>  							}
>  		});
>  				
>  		map.setCenter(new OpenLayers.LonLat(-73, 3), 3);
> IT DOESN'T WORK, I get the error :
>  maxExtent is null. What can I do??? I hope somebody can help me.

Hi

you must call setCenter in the Ajax callback, else there's chance that
there'sno layer in thw map at the time setCenter is called.


>

-- 
Eric Lemoine

Camptocamp France SAS
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Mail : eric.lemoine at camptocamp.com
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