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Get FeatureLayer from Map

PaulGiard

I am a little stuck here and I hope someone can point me to the right place.

Using the ArcGIS-js-api in Angular / Typescript

I am able to display a WebMap via an internal Portal instance.

I can access the Layers that the Map is composed of but I am unable to get the layer as a featureLayer.

All of the examples I see are adding a featureLayer to the map.

How can I get a featureLayer from the Map?

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Accepted answers

PaulGiard

It looks like it is a problem with Typings. The code works when casting directly:

const featureLayer: esri.FeatureLayer = this.mapView.map.findLayerById('69bf94b82f1a4ff8b7afcf370b8c00db') as esri.FeatureLayer;

All comments

diaconori

Isn't there a way to do this without providing the value through a hard-coded string?

Something like:

var layers = this.map.getLayers();
// process layers in a for-each loop...

PaulGiard

It looks like it is a problem with Typings. The code works when casting directly:

const featureLayer: esri.FeatureLayer = this.mapView.map.findLayerById('69bf94b82f1a4ff8b7afcf370b8c00db') as esri.FeatureLayer;

PaulGiard

I did try that and I get the same issue as when I loop through the Layer Collection

FindLayerById returns a Layer and I don't know how to cast to a FeatureLayer

Type 'Layer' is not assignable to type 'FeatureLayer'.
Property 'capabilities' is missing in type 'Layer'.

rscheitlin

Paul,

Be sure to add a tag to your post or some text stating the API version your are targeting.

So in 4.x when using a WebMap you just use the WebMaps findLayerById

https://developers.arcgis.com/javascript/latest/api-reference/esri-WebMap.html#findLayerById

PaulGiard

Thanks for the response,

I am using 4.8 and there is no getLayer method on the Map

rscheitlin

Paul,

If you are taking 3.x then it is as simple as:

<SPAN class="keyword token">var</SPAN> incidentLayer <SPAN class="operator token">=</SPAN> map<SPAN class="punctuation token">.</SPAN><SPAN class="token function">getLayer</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"incidentLayer"</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="line-numbers-rows"><SPAN>‍</SPAN></SPAN>

This assumes you know the id of the layer.

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