how to wait for layer definition expression to take effect

[MichaelLev]

I'm developing custom widgets for WAB (Develper Edtion) 2.17, Launchpad Theme, on 3D Scenes (ArcGIS API for javascript 4.17), on our compamy portal (version 10.7.1).

I am still a newbie...

I need to create screenshot after setting definition expression for 2 layers, but I don't know how to wait for the layers view to settle, so that the screenshot will show the layers after some features in both layers have been hidden by the new definition expressions.

Help will be greatly appreciated,

Michael

[RobertScheitlin__GISP · Accepted solution]

Michael,

  You would add a watch on the layer view.

view.whenLayerView(fLayer).then(function(layerView){
  watchUtils.whenFalseOnce(layerView, "updating", function(upDone){
    //The layer is done updating
  });
});

[MichaelLev]

Dear Robert,

Thank you for your many immediate answers. You are helping me so much! I don't have words to thank you as I have to!

Michael