https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/layer-index-in-addlayer-layer-index/m-p/1137664#M76113 <P>I'm using the ArcGIS API for JavaScript v. 3.x and I want to us the map.addLayer(layer, index) function, however, the documentation is fairly weak.&nbsp; From my experience, I believe it is the index from bottom to top of the layer in all operational layers.&nbsp; However, I don't see a good function to retrieve the index of a layer.&nbsp; Since I am programmatically inserting layers into the map and since I have a large number of layers, I need to be able to look up a layer by its ID and get its index.&nbsp; Is there anything OOTB for this?&nbsp; Also, is the index for all operational layers or just within map.layerIds or map.graphicsLayerIds?&nbsp; I notice it's easier to handle in the 4.x API, so I am guessing this is a weakness in the API or my knowledge.</P><P><A href="https://developers.arcgis.com/javascript/3/jsapi/map-amd.html#addlayer" target="_self">https://developers.arcgis.com/javascript/3/jsapi/map-amd.html#addlayer</A></P><P>&nbsp;</P><P>&nbsp;</P><H4>addLayer(layer, index?)</H4> Wed, 26 Jan 2022 22:11:55 GMT NathanHeickLACSD 2022-01-26T22:11:55Z https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/layer-index-in-addlayer-layer-index/m-p/1137664#M76113 <P>I'm using the ArcGIS API for JavaScript v. 3.x and I want to us the map.addLayer(layer, index) function, however, the documentation is fairly weak.&nbsp; From my experience, I believe it is the index from bottom to top of the layer in all operational layers.&nbsp; However, I don't see a good function to retrieve the index of a layer.&nbsp; Since I am programmatically inserting layers into the map and since I have a large number of layers, I need to be able to look up a layer by its ID and get its index.&nbsp; Is there anything OOTB for this?&nbsp; Also, is the index for all operational layers or just within map.layerIds or map.graphicsLayerIds?&nbsp; I notice it's easier to handle in the 4.x API, so I am guessing this is a weakness in the API or my knowledge.</P><P><A href="https://developers.arcgis.com/javascript/3/jsapi/map-amd.html#addlayer" target="_self">https://developers.arcgis.com/javascript/3/jsapi/map-amd.html#addlayer</A></P><P>&nbsp;</P><P>&nbsp;</P><H4>addLayer(layer, index?)</H4> Wed, 26 Jan 2022 22:11:55 GMT https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/layer-index-in-addlayer-layer-index/m-p/1137664#M76113 NathanHeickLACSD 2022-01-26T22:11:55Z