BUG-000131304 for ArcGIS API for JavaScript

Bug ID Number	BUG-000131304
Submitted	June 2, 2020
Last Modified	June 5, 2024
Applies to	ArcGIS API for JavaScript
Version found	3.32
Operating System	Windows OS
Operating System Version	10.0 64 Bit
Status	Will Not Be Addressed

Additional Information

When a layer in a map service is used as feature layer in on-demand mode: 1. FL fetches less features per tile request because maxRecordCount is 2000 (whereas the layer has 4938 total features). 2. FL also applies feature generalization based on the current map scale. As a result, features that are too small after generalization have no coordinates at all. 3. When a selection query is executed for the full extent, only features that have coordinates match the query. So, only a subset of features are selected. 4. As you zoom in, number of features fetched and selected change because: number of request tiles changes, maxAllowableOffset changes. When layer in a feature service is used as feature layer in on-demand mode: 1. FL fetches more features per tile request because it uses resultType=tile and that increases the maxRecordCount to 4000 2. The layer is editable. So, feature generalization is disabled - resulting in features having all their coordinates regardless of map scale. 3. When selection query is executed for the full extent, all features available in memory match the query. This is the reason for the difference in feature count when selecting features in a map service layer versus a feature service layer. This can be fixed in couple of ways: 1. Configure the layer in "snapshot" mode so that the layer will fetch all features up front. An example is provided below, featureLayer = new FeatureLayer( "https://essanalytics.esri.com/server/rest/services/SMRoads/FeatureServer/0", { mode: FeatureLayer.MODE_SNAPSHOT } ); 2. Enable WebGL for the web application by setting "esri-featurelayer-webgl" has flag to true and configure the layer as not editable. An example is provided below: featureLayer = new FeatureLayer( "https://essanalytics.esri.com/server/rest/services/SMRoads/FeatureServer/0", { mode: FeatureLayer.MODE_ONDEMAND, outFields: ["*"], editable: false } );