Hey there!
In ArcGIS Enterprise, when you want to call or reference fields from a feature layer that is not directly part of the web map, you generally need to use Arcade expressions in a context where that feature layer is accessible. Arcade expressions are typically used for labeling, symbology, and pop-ups within the context of a web map or a web application.
If the feature layer you want to reference is outside the web map, you might need to work within an environment that allows for cross-layer querying or lookups. Here's a general approach using Arcade expressions in a scenario where you can access the data via the layer:
// Define the related layer by name
var relatedLayer = FeatureSetByName($map, "Related Layer Name");
// Filter and retrieve the desired feature
var relatedFeature = First(relatedLayer);
// Access the field values from the related feature
var relatedFieldValue = relatedFeature.YourFieldName;
// Use the value in your expression
return relatedFieldValue;
Always check the latest documentation or support forums for ArcGIS Enterprise, as functionality can evolve, and new features or methods may be introduced in newer versions.
