topic Re: Feature Layer not returning geometry Extent of Selected Feature in ArcGIS JavaScript Maps SDK Questions

Feature Layer not returning geometry Extent of Selected Feature

VishakhaDubey — Tue, 09 Apr 2013 06:46:54 GMT

Hi Everyone

I am using an ArcGIS rest service in my map. I want to zoom to the feature selected by user. Although I have set returngeometry = "true" I am not able to get the extent of selected feature. The extent returned in the application is null. But when querying directly on the layer i.e. not from the application geometry points are returned. The features are being selected from a combo box. The service I am using is using a gdb and has a related table too. Can anyone suggest something.

Re: Feature Layer not returning geometry Extent of Selected Feature

JanJeske — Tue, 09 Apr 2013 06:59:19 GMT

Can you post the explained code please

Re: Feature Layer not returning geometry Extent of Selected Feature

VishakhaDubey — Fri, 10 Dec 2021 21:15:42 GMT

Heer is the function that is called on the onchange event of combobox.

function zoomToPst(item)
{

        var id;
        var psname=item.value.toString();
        var selectedTaxLot;
       // alert("acname" + acname);
       var queryTask1 = new esri.tasks.QueryTask
                ("http://mrsac.maharashtra.gov.in/ArcGIS/rest/services/MRSACServices/election/MapServer/0");

       var symbol = new esri.symbol.PictureMarkerSymbol({
          "angle":0,
          "xoffset":0,
          "yoffset":10,
          "type":"esriPMS",
          "url":"http://static.arcgis.com/images/Symbols/Shapes/BluePin1LargeB.png",
          "contentType":"image/png",
          "width":24,
          "height":24
        });

       var query1 = new esri.tasks.Query();
       query1.returnGeometry = true;
       query1.outFields = ["OBJECTID"];
       query1.where = "District= 'Nagpur' and AC_Name='"+ddl1+"' and PopupInfo='"+psname+"' ";
       //alert("qry rdy");
       alert(""+"District= 'Nagpur' and AC_Name='"+ddl1+"' and PopupInfo='"+psname+"' ");
       queryTask1.execute(query1,function(results)
       {
           var zone;
            var values = [];
            var testVals={};
            //alert("in exe qry");
            //Add option to display all zoning types to the ComboBox
            values.push({name:"ALL"})

            //Loop through the QueryTask results and populate an array
            //with the unique values
            var features = results.features;
            
            dojo.forEach (features, function(feature) {
              id=feature.attributes.OBJECTID;
        });
       
        alert("id"+id);
        dojo.forEach(map.graphics.graphics,function(graphic)
        {
           if(graphic.attributes)
            {
                alert("gid"+graphic.attributes.OBJECTID);
                if(graphic.attributes.OBJECTID === id)
                {
                    selectedTaxLot = graphic;
                    alert("slct");
                    return ;
                }
            }
        });
        alert("sext"+selectedTaxLot.geometry.getExtent())
        var taxLotExtent = selectedTaxLot.geometry.getExtent();
        map.setExtent(taxLotExtent);
       });
}

Re: Feature Layer not returning geometry Extent of Selected Feature

JohnGravois — Tue, 09 Apr 2013 15:57:37 GMT

when querying directly on the layer i.e. not from the application geometry points are returned

do you mean that the geometry type for this layer is point? if so, getExtent() is expected to return null, because only polyline, polygon and multipoint geometries have a precalculated extent.

as an alternative, you should be able to construct your own extent object using the point geometry of the feature instead (by adding and subtracting fixed values).