add Only button to layerlist in API and WAB

Idea created by kmsagis on Aug 16, 2019
    New
    Score10
    • kmsagis

    Add 'only' next to a layer in the layer list and the WebApp Builder Layer List, so clicking it would turn on that layer ONLY and turn off all others. The 'only' would show up on a hover from the cursor. This is how Google Flights and SkipLagged.com work.  It's a very effective UI.