topic Labeling Polygons Returned from a Query Task in ArcGIS API for Flex Questions

Labeling Polygons Returned from a Query Task

JamesBerg — Fri, 01 Feb 2013 17:10:15 GMT

I am using a QueryTask object to query two feature classes via REST services. They both take a user drawn geometry and do an intersection to get the values that are underneath that geometry. The first feature is a polygon and returns the selected polygons from the QueryTask. The second queries a Point feature and uses the Statistics functionality to group by the Polygon ID that is on each point. I want to then show the totals returned by the second feature class as a lable on the polygons returned from the first Query. Is there a way to do this? I can't figure out how to add labels to the polygon features returned from the QT.

Re: Labeling Polygons Returned from a Query Task

RobertScheitlin__GISP — Fri, 01 Feb 2013 17:21:23 GMT

James,

If you are using an ArcGIS Server 10.1 map service than you should look at this sample:

http://resources.arcgis.com/en/help/flex-api/samples/01nq/01nq00000086000000.htm

If not than you have a lot of code work ahead of you to accomplish this.

You will have to get the polygon centroid or use the GeometryService to get the labelpoint and then create a point graphics layer from those points and assign the label text you wish to use as an attribute to each point.

Assign a TextSymbol as the graphics layers symbol and assign the field that you put the label text into as the textAttribute.

Good luck with this

Re: Labeling Polygons Returned from a Query Task

JamesBerg — Fri, 01 Feb 2013 17:56:57 GMT

Robert,

The second option is the path I am going down at this point. The only problem I have is I don't know how to match up the points returned from the Geometry Service to the polygons they were created from to assign labels to them. Any ideas on that? Am I missing some kind of parameter that will assign some value to the points returned?

James

Re: Labeling Polygons Returned from a Query Task

RobertScheitlin__GISP — Fri, 01 Feb 2013 18:00:13 GMT

James,

They will always come back in the same order you sent them in.