Hello great and awesome developers,

I am creating a Form for a small Political Party to use in registering its members.

From the details that users enter for State, Local Government, and Ward,I need to generate a Unique User ID from these details and append their WordPress assigned ID to the end.

I’ve been able to dynamically enable “limit selection” — in which case, if you select a State, you can only select Local Governments within that State, in the Local Government Dropdown field.

I did this through the “Choices callback” feature in Ultimate Member, seen from here — https://docs.ultimatemember.com/article/1539-choices-callback-feature-in-um-2-1

A BACKGROUND
Each Local Government has Local Government Name and Local Government Code.

Each Ward has Ward Name and Ward code.

For example, Abia State has Abia North as a Local Government, and Abia North Local Government code is 01.

Abia North Local Government has many Wards, and two Wards are listed below with their Ward codes:

Eziama with Code 01.
Osusu with Code 02.

THE PROCESS
1.) Have an array for each Local Government and its Local Government Code.

If a user selects a Local Government in the Dropdown field, auto-populate a Text field called “LGA Code” with the corresponding Local Government Code.

2.) Have an array for each Ward and its Ward Code.

If a user selects a Ward in the Dropdown field, auto-populate a Text field called “Ward Code” with the corresponding Ward Code.

QUESTION
Please, how do I achieve this?

WHAT I HAVE TRIED
I used the “Choices callback” feature in Ultimate Member, seen from here — https://docs.ultimatemember.com/article/1539-choices-callback-feature-in-um-2-1

But this is for selection through a Dropdown field.

Ultimate Member documentation didn’t show us how to auto-populate a Text field with inputs derived from a Dropdown field array.

Special Regards.