I've created a relationship class in Desktop and published to ArcGIS Online as a service. The relationship still exists between my table and feature service but when I try to add one of the fields from the related table to my POP-UPS all I get is the count showing how many rows were returned in the related table. What I'd like is a ordered list showing the actual values, not the count. The cardinality of my join is many rows in the table to one value in the feature service (many:one). I find it odd that ESRI would include this functionality in their popups if all you could get is the count though I've read where a few others had the same issue. Perhaps Arcade expressions provide the answer. Does anybody know if it's possible to show the values from related tables in ArcGIS Online Pop-Ups?
[GIS] Related Tables in ArcGIS Online
arcgis-onlinepopuprelationship-class
Best Answer
It is possible to do using Arcade expressions. See example here of a 1:M join between parcels and addresses: Residential Permit Parking
I'm not sure this is the most efficient way to accomplish this, but it works: