[OpenLayers-Users] GetFeatureInfo map.events.register for *many* WMS layers

cgp carina_palanca at forcorp.com
Mon Sep 14 15:02:04 EDT 2009


I have about 10 or more WMS layers that I'm adding to the map. I'm using
GetFeatureInfo to get values for each layer. So I have 10 of these:
------------------------------------------------------------------------------
map.events.register('click', map, function (e) {
	if (map.layers[layer_index].visibility==true) {
		var params = {	REQUEST: "GetFeatureInfo",
					EXCEPTIONS: "application/vnd.ogc.se_xml",
					BBOX: map.getExtent().toBBOX(),
					X: e.xy.x,
					Y: e.xy.y,
					INFO_FORMAT: 'text/html',
					QUERY_LAYERS: map.layers[layer_index].params.LAYERS,
					FEATURE_COUNT: 50,
					Styles: '',
					Layers: layer_name,
					srs: 'EPSG:900913',
					WIDTH: map.size.w,
					HEIGHT: map.size.h,
					format: 'image/png'	};
		event = e;
		OpenLayers.loadURL("http://app-serv-01-uat/geoserver/wms", params, this,
setHTML, setHTML);
	}
OpenLayers.Event.stop(e);
});
------------------------------------------------------------------------------

And since I have 10 of those for each of the 10 different layers, my code is
getting too long, messy and unmanageable. I tried to refactor it by creating
a for loop:

------------------------------------------------------------------------------
var layers_names = new
Array('sde:forests','sde:lakes','sde:trails,'sde:boundary','sde:buffallo','sde:fish','sde:birds','sde:picnic_sites','sde:rivers','sde:camping');
var layer_indices = new Array(5,6,7,8,9,10,11,12,13,14);
		
var layer_name;
var layer_index;
		
for (var i=0; i<layers_names.length; i++) {
	layer_name = layers_names[i];
	layer_index = layer_indices[i];
			
	alert(layer_name+" "+layer_index);
			
	map.events.register('click', map, function (e) {
		if (map.layers[layer_index].visibility==true) {
			var params = {	REQUEST: "GetFeatureInfo",
						EXCEPTIONS: "application/vnd.ogc.se_xml",
						BBOX: map.getExtent().toBBOX(),
						X: e.xy.x,
						Y: e.xy.y,
						INFO_FORMAT: 'text/html',
						QUERY_LAYERS: map.layers[layer_index].params.LAYERS,
						FEATURE_COUNT: 50,
						Styles: '',
						Layers: layer_name,
						srs: 'EPSG:900913',
						WIDTH: map.size.w,
						HEIGHT: map.size.h,
						format: 'image/png'	};
			event = e;
			OpenLayers.loadURL("http://app-serv-01-uat/geoserver/wms", params, this,
setHTML, setHTML);
		}
	OpenLayers.Event.stop(e);
});
}
------------------------------------------------------------------------------

My problem with this is that the click event sticks to the last array value
only. In this example, the GetFeatureInfo will only be fired on layer 12,
'sde:camping'. For the rest of the previous layers, it won't fire at all. I
might be missing something, so can someone help me out? Thank you very much.
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