Highlight Features by Geometry
Use the Sketch Widget's rectangle tool to draw a selection area on the map. Features that intersect the rectangle will be highlighted and shown in the Feature Table below. Draw multiple rectangles to expand the selection. Use the "Clear Selection" button to reset.
This sample uses code from our GeoBlazor Pro extensions library.
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GeoBlazor
dymaptic
About this sample
This GeoBlazor Pro sample, written in Blazor for .NET developers, demonstrates spatial selection by drawn geometry from the ArcGIS Maps SDK for JavaScript exposed through GeoBlazor Pro's SketchWidget and FeatureTableWidget Razor components combined with FeatureLayerView feature effects. The page shows a 2D Albers Equal Area projection map of the contiguous United States with a custom cream-and-gray basemap and a National Park Service points-of-interest FeatureLayer overlaid. A SketchWidget pinned in the upper-left corner provides a rectangle drawing tool, and a Clear Selection button sits beside it. Below the map is a FeatureTableWidget that lists every NPS feature. When the user drags a rectangle on the map, the sample queries the layer view for intersecting features, blurs and dims the rest using a FeatureEffect, highlights the selected rows in the table, and synchronizes hovering rows with on-map highlights. The sample is intended to demonstrate coordinated spatial-and-tabular selection driven by user-drawn geometry.