Variable string query outFields vs hard-coding

[GregoryBologna]

Why does variable string query outFields fail for FeatureLayer?

Example:

var queryFields = "FIELD1,FIELD2";

const query = mapLayerView.createQuery();
query.outFields = [queryFields]; This works!

const queryFeatureLayer = new FeatureLayer({
   url: url,
   outFields: ["FIELD1", "FIELD2"]
   // outFields: [queryFields] This will return error below
});

Error
esri.layers.support.fieldProperties] field-attributes-layer:invalid-field Invalid field FIELD1,FIELD2 found in outFields {layer: v, outFields: Array(1)}

[UndralBatsukh · Accepted solution]

Hi there, 

Both FeatureLayer.outFields and Query.outFields expect string of arrays. Query.outFields accepting string of field names is not supported in the JS API and is working accidentally. 🙂