topic Re: Can Graphics Layers be Queried? in ArcGIS JavaScript Maps SDK Questions

Can Graphics Layers be Queried?

ChristopherSchreiber — Wed, 03 May 2017 14:22:20 GMT

Hello,

Can Graphics Layers be Queried? I cannot see anywhere that says that they cannot.

I know that CSV Layers cannot be queried.

Thanks,

Chris

Re: Can Graphics Layers be Queried?

RobertScheitlin__GISP — Wed, 03 May 2017 14:41:59 GMT

Chris,

The simple answer is No. But you could manually query the GL by looping through it's graphics and checking the graphics attributes.

Re: Can Graphics Layers be Queried?

ThomasSolow — Sun, 12 Dec 2021 02:15:15 GMT

In the 4.XX API a layer view can be queried for a graphics layer the same way you would query the layer view for a feature layer:

// source: https://developers.arcgis.com/javascript/latest/api-reference/esri-layers-FeatureLayer.html
// returns all the graphics from the layer view
view.whenLayerView(lyr).then(function(lyrView){
  lyrView.watch("updating", function(val){
    if(!val){  // wait for the layer view to finish updating
      lyrView.queryFeatures().then(function(results){
        console.log(results);  // prints all the client-side graphics to the console
      });
    }
  });
});‍‍‍‍‍‍‍‍‍‍‍

You could pass a Query into layerView.queryFeatures with an extent geometry and the 'intersects' spatial relationship to query for features inside an extent. See Query | API Reference | ArcGIS API for JavaScript 4.3 for more details.

If you're using the 3.XX API, my bet would be that you could easily write a query method yourself by accessing each graphic in a graphics layer and using the geometry engine to test each one. This is not an approach that scales especially well. I'm not sure if layerView.queryFeatures scales very well either.

Re: Can Graphics Layers be Queried?

ChristopherSchreiber — Wed, 03 May 2017 15:41:29 GMT

Thank you all for the feedback!

Re: Can Graphics Layers be Queried?

RyanSutcliffe — Thu, 14 Nov 2019 02:17:28 GMT

I could be wrong but I don't see how you can get a LayerView class from a GraphicsLayer. Seems a GraphicsLayer creates a GraphicsLayerView which only has queryGraphics(). The example and link above works only for a FeatureLayer. If either of you were indeed able to do the above would love to see a code sample of how you got this: specifically a LayerView from a GraphicsLayer in a map.

Re: Can Graphics Layers be Queried?

RyanSutcliffe — Thu, 14 Nov 2019 17:46:16 GMT

Taking a second look this morning I see how you can take a collection of graphics and set them as a source for a new FeatureLayer. That way you have access to queryFeatures and related functionality. I thought that a FeatureLayer required a REST endpoint or Map/FeatureService as it's source.

Re: Can Graphics Layers be Queried?

Sparkles — Mon, 21 Oct 2024 17:14:31 GMT

Hi @RyanSutcliffe , did you manage to get this to work for querying a GraphicsLayer? Would you be open to sharing a code snippet? Thank you very much!

Re: Can Graphics Layers be Queried?

Sparkles — Mon, 21 Oct 2024 17:38:56 GMT

Hi @RyanSutcliffe , did you manage to get this to work for querying a GraphicsLayer? Would you be open to sharing a code snippet? Thank you very much!

Re: Can Graphics Layers be Queried?

RyanSutcliffe — Wed, 23 Oct 2024 01:15:40 GMT

Its been a few years, if I recall the above OP's code worked, the trick was to make your graphicsLayer the source of a FeatureLayer and then you should be good to go. Sorry no codepen kicking around.