Server Side Queries
This sample demonstrates a query on a feature layer that lives on a server. On the click action, the feature layer is queried to find which features were clicked, and then the results are used to open a custom popup.
GeoBlazor
dymaptic
About this sample
This GeoBlazor sample, written in Blazor for .NET developers, demonstrates server-side FeatureLayer queries (queryFeatures) from the ArcGIS Maps SDK for JavaScript exposed through GeoBlazor's FeatureLayer.CreateQuery, QueryFeatures, and PopupWidget Razor components. The page shows a 2D dark-gray basemap of San Francisco overlaid with a crimes-by-block-group FeatureLayer. A LegendWidget for the crime layer sits in the lower-left corner of the map. In the upper-right a CustomOverlay panel contains a dropdown labeled Basic Query or Query By Distance. The user picks a query type and clicks anywhere on the map; the click point is sent as the query geometry (with a half-mile distance buffer when Query By Distance is selected) and the matching features are returned from the server. A blue marker is drawn at the click point, an optional buffer polygon is drawn for distance queries, and the docked PopupWidget at the bottom-right is populated with the returned features so the user can page through them. The sample is intended to demonstrate executing spatial queries against a hosted FeatureLayer in a Blazor application without writing JavaScript.