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2012-12-28T03:26:47.500
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Not just the polygon id, you could get any parameter from a map service by doing this... 1)Create a new IdentifyTask() by passing the MapService as the parameter. <pre><code>identifyTask = new esri.tasks.IdentifyTask("<Map Service URL should go here>"); </code></pre> 2)Create a new IdentifyParameters() and set the following attributes. <pre><code>identifyParams = new esri.tasks.IdentifyParameters(); identifyParams.tolerance = 2; identifyParams.returnGeometry = true; identifyParams.layers = esri.tasks.IdentifyParameters.LAYER_OPTION_ALL; identifyParams.layerIds = [0,1,2,3,4]; identifyParams.sr=map.spatialreference; identifyParams.width = map.width; identifyParams.height = map.height; </code></pre> 3) A method should be invoked upon mouse click. You can do that like <pre><code>dojo.connect(map, "onClick", uponClick); </code></pre> 4) When a polygon is clicked, uponClick() method will be called. Inside the uponClick() method, call the identifyTask.execute by passing identifyParams as parameter. <pre><code>function uponClick(evt){ identifyParams.geometry = evt.mapPoint; identifyParams.mapExtent = map.extent; identifyTask.execute(identifyParams, function(result) { for(var i=0; i<result.length; i++){ polyId=result[i].feature.attributes["UNIQPOLYID"]; }//end of for });//end of execute }//end of uponClick </code></pre> UNIQPOLYID is one of those methods that the map service would return. You could find a detailed sample at this link <a href="http://help.arcgis.com/en/webapi/javascript/arcgis/help/jssamples_start.htm#jssamples/find_drilldown.html" rel="nofollow">http://help.arcgis.com/en/webapi/javascript/arcgis/help/jssamples_start.htm#jssamples/find_drilldown.html</a>
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