https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/how-to-tell-when-all-layers-and-sublayers-are-done/m-p/1134892#M75977 <P>I have a list of both the layers and map-image sublayers, that I want to keep updated.&nbsp; It should update in the beginning, whenever all the initial layers/sublayers are done loading, as well as whenever a layer is added or removed from the map.&nbsp; In any case, I need to wait until any new layers and sublayers are done loading, or the list is inaccurate.</P><P>This is what I was trying:</P><P>&nbsp;</P><LI-CODE lang="javascript">const layersWatch = mapView.map.allLayers.on('change', (event) =&gt; { if(event.target) { setLayersUpdating(true); const allLayerWhens = event.target.map((layer) =&gt; { return layer.when(); }); Promise.allSettled(allLayerWhens).then((loadedLayerResults) =&gt; { // It gets here with the expected results... const allSublayerWhens = []; loadedLayerResults.forEach((result) =&gt; { if (result.value?.allSublayers?.length) { result.value.allSublayers.forEach((sublayer) =&gt; { allSublayerWhens.push(sublayer.when()); }); } }); Promise.allSettled(allSublayerWhens).then(() =&gt; { // ...but never gets here: setLayersUpdating(false); }); }); } });</LI-CODE><P>&nbsp;</P> Wed, 19 Jan 2022 07:32:24 GMT DavidKlinger 2022-01-19T07:32:24Z https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/how-to-tell-when-all-layers-and-sublayers-are-done/m-p/1134892#M75977 <P>I have a list of both the layers and map-image sublayers, that I want to keep updated.&nbsp; It should update in the beginning, whenever all the initial layers/sublayers are done loading, as well as whenever a layer is added or removed from the map.&nbsp; In any case, I need to wait until any new layers and sublayers are done loading, or the list is inaccurate.</P><P>This is what I was trying:</P><P>&nbsp;</P><LI-CODE lang="javascript">const layersWatch = mapView.map.allLayers.on('change', (event) =&gt; { if(event.target) { setLayersUpdating(true); const allLayerWhens = event.target.map((layer) =&gt; { return layer.when(); }); Promise.allSettled(allLayerWhens).then((loadedLayerResults) =&gt; { // It gets here with the expected results... const allSublayerWhens = []; loadedLayerResults.forEach((result) =&gt; { if (result.value?.allSublayers?.length) { result.value.allSublayers.forEach((sublayer) =&gt; { allSublayerWhens.push(sublayer.when()); }); } }); Promise.allSettled(allSublayerWhens).then(() =&gt; { // ...but never gets here: setLayersUpdating(false); }); }); } });</LI-CODE><P>&nbsp;</P> Wed, 19 Jan 2022 07:32:24 GMT https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/how-to-tell-when-all-layers-and-sublayers-are-done/m-p/1134892#M75977 DavidKlinger 2022-01-19T07:32:24Z https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/how-to-tell-when-all-layers-and-sublayers-are-done/m-p/1134955#M75984 <P><A href="https://community.esri.com/t5/arcgis-api-for-javascript-questions/when-featurelayer-done-drawing/m-p/548912#M51085" target="_blank">Solved: When featurelayer done drawing - Esri Community</A></P><P><A href="https://odoe.net/blog/quick-tip-arcgis-api-4-js-stuff-ready/" target="_blank">Quick Tip: ArcGIS API 4 for JS - When stuff is ready? (odoe.net)</A></P> Wed, 19 Jan 2022 15:01:03 GMT https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/how-to-tell-when-all-layers-and-sublayers-are-done/m-p/1134955#M75984 BlakeTerhune 2022-01-19T15:01:03Z