topic Re: Check if feature layer can be added before adding in ArcGIS JavaScript Maps SDK Questions

Check if feature layer can be added before adding

Aeseir — Tue, 14 Feb 2023 09:41:57 GMT

Is there any way to determine if a feature layer can be accessed by the map before adding it?

In cases where a layer is a protected resource, I don't want it sitting in the layerlist with a warning that it is not accessable.

Re: Check if feature layer can be added before adding

Christer — Wed, 15 Feb 2023 15:16:31 GMT

Hi, you can manually try load the layer before adding it to the map. if im not mistaken.

Sample:

import { whenOnce } from '@arcgis/core/core/reactiveUtils'; myLayer = new FeatureLayer(..) whenOnce(() => myLayer.loaded == true).then(() => { console.log('All good'); view.map.add(myLayer); }); myLayer.load();

Re: Check if feature layer can be added before adding

Aeseir — Wed, 22 Feb 2023 08:03:41 GMT

close @Christer , no need for whenOnce().

It ended up being along the lines of:

try { await layer.load(); // execute rest of code } catch (e) { // manage exception }