topic Re: Zoom to specific layer extent in ArcGIS API for Flex Questions

Zoom to specific layer extent

LukeEvans — Mon, 28 Jun 2010 09:11:06 GMT

Hi,

I need to be able to zoom to the extent of a specific layer. Zooming to the initial/full extent of a Map Server isn't a problem. The issue is trying to get the extent for a specific layer under this.

Here for example. How would I retrieve the extent values? The only layer specific information I can seem to retrieve is from a LayerInfo object, which doesn't contain the details I need

Thanks

Luke

Re: Zoom to specific layer extent

RobertScheitlin__GISP — Mon, 28 Jun 2010 12:05:54 GMT

Luke,

You need to use the LayerDetails

http://resources.esri.com/help/9.3/arcgisserver/apis/flex/apiref/com/esri/ags/layers/LayerDetails.html

Re: Zoom to specific layer extent

DavideRodomonti1 — Tue, 29 Jun 2010 07:16:46 GMT

Hi Luke did u solve this problem?...I have the same too...
Thanks,
David

Re: Zoom to specific layer extent

LukeEvans — Sat, 11 Dec 2021 11:52:38 GMT

Luke,

You need to use the LayerDetails

http://resources.esri.com/help/9.3/arcgisserver/apis/flex/apiref/com/esri/ags/layers/LayerDetails.html

Thanks for your help. I've got it working now

Hi Luke did u solve this problem?...I have the same too...
Thanks,
David

Here's just some little example hacked up code I got going just to test it out

  public function zoomToLayerExtent(layerID:int, layer:ArcGISDynamicMapServiceLayer):void
  {
   var responder:IResponder = new Responder(layerDetailsResult, layerDetailsFault);
   layer.getDetails(layerID,responder);
  }

  public function layerDetailsResult(layerDetails:LayerDetails):void
  {
   // Handle LayerDetails here.  Zoom to layer extent from layerDetails.extent
  }

  public function layerDetailsFault():void
  {
                       // Error code
  }

Re: Zoom to specific layer extent

DavideRodomonti1 — Sat, 11 Dec 2021 11:52:41 GMT

Thanks for your help. I've got it working now

Here's just some little example hacked up code I got going just to test it out

  public function zoomToLayerExtent(layerID:int, layer:ArcGISDynamicMapServiceLayer):void
  {
   var responder:IResponder = new Responder(layerDetailsResult, layerDetailsFault);
   layer.getDetails(layerID,responder);
  }

  public function layerDetailsResult(layerDetails:LayerDetails):void
  {
   // Handle LayerDetails here.  Zoom to layer extent from layerDetails.extent
  }

  public function layerDetailsFault():void
  {
                       // Error code
  }

Thanks Luke, it works....but I dont get what I want...
Cause in my code I first apply a layerDefinitions and I want that map.extent is the new layer.extent but I get the original layer extent... :((( :

     
var dLayer:ArcGISDynamicMapServiceLayer = map.getLayer("Map") as ArcGISDynamicMapServiceLayer;
         var layerDefs:Array = new Array();
         var layerStr:String = new String();    
         layerDefs[0] = "c_edificio='" + txtMessage.text + "'";
         layerDefs[1] = "";
         layerDefs[2] = ""; 
         layerDefs[3] = "";         
         dLayer.layerDefinitions = layerDefs;
         dLayer.refresh();
         zoomToLayerExtent(0,dLayer);

Re: Zoom to specific layer extent

RobertScheitlin__GISP — Sat, 11 Dec 2021 11:52:44 GMT

David,

The rest service directory that the LayerDetails is getting the extent info from does not know about any layer definitions that you have applied (as those are client side).

To do what you are trying to do you need to query the map service using your same layer definition query and then get the graphics extent, like this

var graphicsExtent:Extent = GraphicUtil.getGraphicsExtent(featureSet.features);
                        if (graphicsExtent)
                        {
                            map.extent = graphicsExtent;
                        }

Re: Zoom to specific layer extent

DavideRodomonti1 — Sat, 11 Dec 2021 11:52:47 GMT

David,

The rest service directory that the LayerDetails is getting the extent info from does not know about any layer definitions that you have applied (as those are client side).

To do what you are trying to do you need to query the map service using your same layer definition query and then get the graphics extent, like this
var graphicsExtent:Extent = GraphicUtil.getGraphicsExtent(featureSet.features);
                        if (graphicsExtent)
                        {
                            map.extent = graphicsExtent;
                        }

Hi Robert, yes u are right I tried with this and it works well!!!
I populated list of value I want to use to make the definition query...but I wish I could use an intelligent text box who show me the values that match in part with what I m writing...
Thank u so much Robert!!
David

Re: Zoom to specific layer extent

RobertScheitlin__GISP — Wed, 30 Jun 2010 10:42:08 GMT

David,

Google "Yahoo Astra"

Re: Zoom to specific layer extent

DavideRodomonti1 — Wed, 30 Jun 2010 12:07:50 GMT

David,

Google "Yahoo Astra"

Thanks Robert, I saw similar things in a link posted in some discussion of sample flex viewer...now I cant find some sample anymore..

David

Re: Zoom to specific layer extent

RobertScheitlin__GISP — Wed, 30 Jun 2010 12:15:39 GMT

David,

Yahoo's site has several examples. There has only been one or two threads on this in the last year or more and none of them deal exactly with what you are doing.

Re: Zoom to specific layer extent

DavideRodomonti1 — Wed, 30 Jun 2010 13:19:13 GMT

David,

Yahoo's site has several examples. There has only been one or two threads on this in the last year or more and none of them deal exactly with what you are doing.

Yes Yes I saw, Thanks again Robert