topic Re: ArcGIS JavaScript API: Zoom to point feature using FindTask in ArcGIS JavaScript Maps SDK Questions

ArcGIS JavaScript API: Zoom to point feature using FindTask

HabG_ — Wed, 01 Oct 2014 10:11:37 GMT

Hi All,

I am using the FindTask in my web map (Note: I have point and polygon layers) and it is working fine. When I search using a keyword from the polygon layer it zooms to the polygon and selects the polygon/s using graphics which is what I wanted. However, when I search using a keyword from the point layer, it pans to the center of the selected point/s and doesn't show any graphics. So what I want is, when I search using a point key word, to zoom to the selected point/s and show a circle or square graphics. Below is the code I'm using (Note: I have changed my server name to "myserver:6080").

Thanks.

findTask = new FindTask("http://myserver:6080/arcgis/rest/services/gisdata/webmap/MapServer/");   
      
      map.on("load", function () {   
          //Create the find parameters   
          findParams = new FindParameters();   
          findParams.returnGeometry = true;   
          findParams.layerIds = [0, 1, 2];   
          findParams.searchFields = ["IDNO", "RESID", "INT", "FTNM"];   
          findParams.outSpatialReference = map.spatialReference;   
          console.log("find sr: ", findParams.outSpatialReference);   
        }); 
        function doFind() {   
          //Set the search text to the value in the box   
          findParams.searchText = dom.byId("SEARCH").value;   
          findTask.execute(findParams, showResults);   
        } 
        function showResults(results) {   
          //This function works with an array of FindResult that the task returns
        var markerSymbol = new SimpleMarkerSymbol(SimpleMarkerSymbol.STYLE_CIRCLE, 10, new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID, new Color([255, 0, 0]), 1.5), new Color([255, 0, 0, 0.5]));
        var polygonSymbol = new SimpleFillSymbol(SimpleFillSymbol.STYLE_SOLID, new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID, new Color([255, 0, 0]), 2), new Color([255, 0, 0, 0.5]));


          //create array of attributes   
          var items = arrayUtils.map(results, function (result) {   
            var graphic = result.feature;   
            graphic.setSymbol(markerSymbol);
            graphic.setSymbol(polygonSymbol);
            map.graphics.add(graphic);   
            return result.feature;  
          }); 
          var myFeatureExtent = graphicsUtils.graphicsExtent(items);  
          map.setExtent(myFeatureExtent, true);
        }

Re: ArcGIS JavaScript API: Zoom to point feature using FindTask

OwenEarley — Wed, 01 Oct 2014 10:24:31 GMT

It seems you are overwriting your point symbol with your polygon symbol:

var graphic = result.feature;
graphic.setSymbol(markerSymbol);  
graphic.setSymbol(polygonSymbol);  // this will replace the previous symbol
map.graphics.add(graphic);

You should test the geometry type before setting the appropriate symbol.

Re: ArcGIS JavaScript API: Zoom to point feature using FindTask

HabG_ — Wed, 01 Oct 2014 10:34:15 GMT

Thanks for your reply Owen. How do I test the geometry type?

Re: ArcGIS JavaScript API: Zoom to point feature using FindTask

JakeSkinner — Wed, 01 Oct 2014 12:36:29 GMT

Hi Hab,

You could do something like below:

var items = arrayUtils.map(results, function (result) { 
  var graphic = result.feature; 
  if(graphic.geometry.type == 'polygon'){
    graphic.setSymbol(polygonSymbol);    
  };    
  if(graphic.geometry.type == 'point'){    
    graphic.setSymbol(markerSymbol);
  }  
    
  map.graphics.add(graphic);     
  return result.feature;    
});

Re: ArcGIS JavaScript API: Zoom to point feature using FindTask

HabG_ — Wed, 01 Oct 2014 13:23:11 GMT

Hi Jake, the graphics is now showing on the point feature not on the polygon feature.

Re: ArcGIS JavaScript API: Zoom to point feature using FindTask

HabG_ — Wed, 01 Oct 2014 13:39:18 GMT

Hi Jake, I changed the second "if" statement to "else" and now I'm able to see the graphics in both point and polygon features. Thanks for your help.

Re: ArcGIS JavaScript API: Zoom to point feature using FindTask

JakeSkinner — Wed, 01 Oct 2014 13:48:10 GMT

Good catch. That was a type-o on my part.