zoom to found features

Question

I would like to zoom on found features (through esri:FindTask, or esri:QueryTask). It works fine when the number of found features is more than one. If the number is one, there is an error indicating that it cannot access properties of null object.

I am using Arcgis Api for Flex 2.5. For the esri:QueryTask, I use "graphicsExtent:Extent = GraphicUtil.getGraphicsExtent(featureSet.features);". For FindTask, I used the sample: http://help.arcgis.com/en/webapi/flex/samples/index.html#/Zoom_to_found_features/01nq0000005n000000/

Any idea what's wrong? Thanks

Jean

rscheitlin · Answer

SS,

You need to look into using the GraphicsUtil class it has a getGraphicsExtent function:

http://resources.arcgis.com/en/help/flex-api/apiref/com/esri/ags/utils/GraphicUtil.html

SRIKANTHSwarna · Answer

Hi,
    How to zoom to Multiple polygons on the map from results, I was able to do zoom to  multiple points.here is the code i used.

code:
 function results(results){ 
  var resultFeatures = results.features; 
  var points =  new esri.geometry.Multipoint(map.spatialReference);
  for (var i=0, il = resultFeatures.length; i<il; i++) {
   if(results.features.geometry.type=="point"){
//IF CONDITION FOR MULTIPLE POINTS ZOOM
    var pointx;
    var pointy;
    pointx = results.features.geometry.x; //webmercator geometry
    pointy = results.features.geometry.y;
    point = new esri.geometry.Point(pointx, pointy,globals.map.spatialReference);                             if(resultFeatures.length=='1'){
     
    map.centerAndZoom((point),13);
    }
      
                 else{
     points.addPoint(point);
     
    }
    //globals.map.graphics.add(new esri.Graphic(point, symbol)); 
    map.graphics.add(new esri.Graphic(point, getZoomSymbol()));  
   }
   else{
//CODE FOR ZOOM TO MULTIPLE POLYGONS
    ext = results.features.geometry.getExtent();
    //results.features.setSymbol(symbol);
    results.features.setSymbol(getZoomSymbol());
    map.graphics.add(results.features);
    var factor = 0;
    if (extent!=null) {    
     extent = extent.union(ext);
    } else {
     extent = ext;
    }
    map.setExtent(extent);
   }
  }
  if(points.points.length>=1){
  .map.setExtent(points.getExtent().expand(3));
  } }

zoom to multiple points is working fine, but for multiple polygons is not working, I mean it is going to zoom to one polygon only, i can't set the extent to see all the polygons on the map.

Thanks,
SS

Jeanlamou · Answer

Perfect, it works. Thanks Feng.

Jean