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Is there any way to get all features using layerview.queryFeatures

JackFairfield

When running queryFeatures on a FeatureLayerView, only the features that are currently in the extent are returned. Is there any way to query for all graphics that have been drawn / downloaded from the server? I would like to be able to get statistics on a large area even if the user is zoomed in and only looking at a few features. I don't want to make any more server / rest endpoint requests, this becomes too slow.

Here is a jsbin that logs the number of features to demonstrate what I am talking about.

https://output.jsbin.com/jojonuhehi

Thanks.

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JackFairfield

Here is another example:

https://jsbin.com/qagezumixa/edit?html,output

I am querying both the layerview and the feature layer itself. My main question is, why aren't these values the same? It appears that all of the points aren't actually being drawn for some reason.

Thanks for your response.

Egge-Jan_Pollé

Hi Jack,

No, maybe I don't really get what you are after...? In the example you included you are accessing a Feature Service with all Census Tracts for all of the United States, including Puerto Rico, while you are zoomed in to New York. So I can imagine that the FeatureLayerView does not contain all 73,642 Tracts, but only those needed to visualize New York...

You want to query more than is actually visible, you say, so I think you should not query the FeatureLayerView, but something else (the FeatureLayer itself....).

Does this make sense?

JackFairfield

Egge-Jan,

Thanks for your response. I understand that I could query the featureLayer to get the correct count, however I would prefer not to make an additional server request if possible. At least some of the points have been requested and drawn on the map. It would be nice if there was a way to query and only get the points that haven't been drawn / received already.

Not sure if what I am talking about makes a lot of sense.

Maybe instead, if there was a way to ensure that all points were drawn in the first place. Why is the api not showing all points?

Egge-Jan_Pollé

Hi Jack Fairfield‌,

From the documentation (ArcGIS API for JavaScript 4.11):

A FeatureLayerView represents the LayerView of a FeatureLayer after it has been added to a Map in either a MapView or SceneView.

Apparently, as you code sample shows, this FeatureLayerView is updated every time you zoom in or out and the queryFeatureCount() only returns the number of features within the view extent.

Solution:

If you want to query more than just the features within the view extent you should not query the FeatureLayerView, but instead the FeatureLayer itself.

See the code snippet (modified from your sample) below: querying the layerView will return a limited number of features (depending on the zoom level) whereas querying the featureLayer will always return 73,642, i.e. the total number of Census Tracts in the Feature Service.

So, accessing the FeatureLayer itself will allow you to query more features than currently present in the view extent.

Does this solve your issue?

Egge-Jan

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