How to get fields of Dynamic Layer hosted by ArcGIS Server?

[ForrestLin]

How to get fields of Dynamic Layer hosted by ArcGIS Server using JavaScript?

[JoelBennett · Accepted solution]

You can create a FeatureLayer object from the REST endpoint URL, and get the information from its fields collection after it loads:

const featureLayer = new FeatureLayer({
	url: "https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/Landscape_Trees/FeatureServer/0"
});

featureLayer.when(function() {
	featureLayer.fields.forEach(function(field) {
		console.info(field.name + " ( type: " + field.type + ", alias: " + field.alias + " )");
	});
});

featureLayer.load();

[ForrestLin]

@JoelBennett 

Thanks.

[ForrestLin]

  public loadFields(url: string): Promise<Field[]> {

    const featureLayer = new FeatureLayer({ url });

    return featureLayer.load().then((layer: FeatureLayer) => {

          return layer.fields;

      });

  }