idea Change layer order in LayerList without changing drawing order in the mapview in ArcGIS JavaScript Maps SDK Ideas

Change layer order in LayerList without changing drawing order in the mapview

Nicolas_ — Thu, 28 Sep 2023 20:04:58 GMT

Is it possible to change the layer order in the LayerList widget without changing the drawing order in the mapview?

I tried using the layerList.viewModel.moveListItem() method, but the mapview is updated to reflect the layerList order.

NOTE: JS api 4.x

Re: Change layer order in LayerList without changing drawing order in the mapview

Sage_Wall — Thu, 28 Sep 2023 20:54:50 GMT

The LayerList is designed to reflect the order of the layers in the map. In part for when `selectionEnabled` is true users can modify the layer order in the map. I'm curious as to your use case for having them be different?

Re: Change layer order in LayerList without changing drawing order in the mapview

Nicolas_ — Fri, 29 Sep 2023 12:59:43 GMT

I use the layerList with selection disabled.

Here is my use case. I have my layers ordered like so:

Basemap reference layers
Point feature layer 1
Point feature layer 2
..
"reference layers" for my imagery layers (Hidden)
Imagery layer 1
Imagery layer 2
..
Basemap

This way, I can display a map like this, with a hidden water layer over my imagery layers:

This work great, but I woud like to be able to group "Point feature layer 1" with Imagery layer 1" and so on because they are actually related. But If I do that, I end up with my Point layers hidden behind the water features:

Maybe there is a way to unsuscribe to some kind of layerList layerMoved event?. Else I might have to directly modify the DOM.

Re: Change layer order in LayerList without changing drawing order in the mapview

Sage_Wall — Fri, 29 Sep 2023 17:05:22 GMT

Sorry @Nicolas_ there isn't anything currently in the API for this, but I think it's a valid use case. I'd like to move this over to ArcGIS Ideas because it could be a great future addition to the JavaScript Maps SDK. The best possible workaround I can see is to duplicate the hidden water layer into each imagery + point group layer, but it's less than ideal to have to add multiple copies of the same layer.

Re: Change layer order in LayerList without changing drawing order in the mapview

Nicolas_ — Mon, 02 Oct 2023 13:26:32 GMT

Understood.

Thank you for moving this to ArcGIS Ideas. I will keep an eye on futur API releases.

Re: Change layer order in LayerList without changing drawing order in the mapview

AddisonShaw — Sun, 29 Oct 2023 14:16:50 GMT

I wrote my own layer list mimicking the behavior of the original, except it uses locally predefined definition expressions