topic Re: Extent-based spatial query on FeatureLayer made from featureCollectionObject in ArcGIS JavaScript Maps SDK Questions

Extent-based spatial query on FeatureLayer made from featureCollectionObject

Jay_Gregory — Wed, 08 Jan 2014 16:23:36 GMT

I have created a FeatureLayer based on a featureCollectionObject (i.e. not from a service URL), and I would like to perform a spatial query on it. The documentation claims that it "does not support queries that need to be performed on the server, e.g. queries with a where clause or non-extent based spatial queries." So according to this, it should support an extent based spatial query. However, when I construct my query:

var query = new Query(); query.geometry = pointToExtent(map, evt.mapPoint, 20);

and try to execute, I get the following error message: "FeatureLayer::selectFeatures - query contains one or more unsupported parameters."

I have tried changing the query.spatialRelationship attribute (from the default INTERECTS to CONTAINS or WITHIN) but that doesn't help. There are no other aspects to the query - no where clause or time clause or anything other than the geometry (which I've set to an extent). Can someone help me execute this query correctly?

Re: Extent-based spatial query on FeatureLayer made from featureCollectionObject

derekswingley1 — Wed, 08 Jan 2014 18:32:10 GMT

Can you post a full repro case?

Edit: here's a working example: http://dl.dropboxusercontent.com/u/2654618/fl-from-fc/fl-from-fc-query-with-extent.html

Relevant code:

map.on("click", function(e) {   map.graphics.clear();   // create an extent   var pad = map.extent.getWidth() / 10;   var extent = new Extent(     e.mapPoint.x - pad, e.mapPoint.y - pad,      e.mapPoint.x + pad, e.mapPoint.y + pad, map.spatialReference   );   // add the extent as a graphic   map.graphics.add(new Graphic(     extent, new SimpleFillSymbol().setColor(null).outline.setColor("#fff")   ));   var q = new Query();   q.geometry = extent;   featureLayer.queryFeatures(q).then(     function(result) {       console.log("query result", result);     },     function(error) {       console.log("query error", error);     }   ); });

Re: Extent-based spatial query on FeatureLayer made from featureCollectionObject

Jay_Gregory — Thu, 09 Jan 2014 15:50:51 GMT

Thanks Derek - I was able to get it to work by copying the format of your example. There were a couple differences with my code (but not much). Following the example's layout solved the problem for me.

The next challenge is to get paging to work with the popups....