[OpenLayers-Users] Click event for 4 maps

[Rahn Hanno (rahn)]

Hello list,

In my project I have 4 maps at one side.
In this maps I show polygon. In each map is the same boundaries but in dieffernt timestamps. First map shows a layer in 1980, second map shows the map in 1990, third in 2000 and last in 2010.
In each year the layer is colored different.
Now I try to realise a click event on the maps. I will get some feature info.

OpenLayers.Control.Click = OpenLayers.Class(OpenLayers.Control, {
					                defaultHandlerOptions: {
					                    'single': true,
					                    'double': false,
					                    'pixelTolerance': 0,
					                    'stopSingle': false,
					                    'stopDouble': false
					                },

					                initialize: function(options) {
					                    this.handlerOptions = OpenLayers.Util.extend(
					                        {}, this.defaultHandlerOptions
					                    );
					                    OpenLayers.Control.prototype.initialize.apply(
					                        this, arguments
					                    );
					                    this.handler = new OpenLayers.Handler.Click(
					                        this, {
					                            'click': this.trigger
					                        }, this.handlerOptions
					                    );
					                },

					                trigger: function(e) {
					                    									
										var lonlat = map.getLonLatFromViewPortPx(e.xy);								
										var bfsCode = bfsNum(lonlat.lon,lonlat.lat,jahr,indikator1);
										var aggregat = aggregatNr(bfsCode,vis);
					
										getHighlightLayer(vis,bfsCode,aggregat);
									
										newLoad(lonlat.lon,lonlat.lat,jahr,indikator1,"nodeListL",vis);
										
										// ein-/ausblenden des Infokastens
										if (nodeListL.style.display == "none") { 								
											toggleMe('nodeListL');									
										}
																														
								    }
																		
            });


In the trigger I first get the coordinates (var lonlat) and then I made a query to the Postgres Database (newload(...)).
But of course this only work for the first map, because of the different coordinates. (map.getLonLatFromViewPort)
Here I must use the coordinates from the different maps but I don't know how I can realise this. Is there a possibility to get the map in this function? I need the coordinates from the map where I have clicked.
Can somebody help me? I only want to get the infos from the database with the click. Perhaps there is another usefull workflow to get this featureinfos?
I use UMN Mapserver and OpenLayers 2.8. The Database is PostGIS 8. The Layer is used as a WMS Layer.

var wms = new OpenLayers.Layer.WMS("Gemeinden",urlArray, {map:mapFile,layers:layerName+",Seen",format:"image/png",EXCEPTIONS:"application/vnd.ogc.se_inimage"},{singleTile: true, ratio:1} ); 

This layer will be styled differently for each year with sld and the "mergeNewParams"-Function.

Perhaps somebody can help me, please. I have no idea.

Greetings
Hanno Rahn



------------------------------------------
Hanno Rahn, Dipl.-Ing. (FH) Geoinformatik
ZHAW Zürcher Hochschule für Angewandte Wissenschaften Umwelt und Natürliche Ressourcen 
Fachstelle Geoinformatik 
Grüental, Postfach CH-8820 Wädenswil 
Tel +41 (0)58 934 5592
Fax +41 (0)58 934 5580 
hanno.rahn at zhaw.ch
www.iunr.zhaw.ch/geoinformatik

 
 

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