Best Practice for Handling Either Dropdown or TextField Input (Exclusive Selection)

Hello ThingWorx Community,

I'm currently working on a use case where a customer can either select a value from a dropdown or manually type a custom value into a text field. The idea is to give users flexibility in providing input.

Here’s the intended logic:

• If the user selects a value from the dropdown and leaves the text field empty → the selected value is passed to a service.

• If the user enters a value in the text field and leaves the dropdown empty → the typed value is passed to the same service.

• If both fields are filled, the service should not execute. Instead, a status message should inform the user to only fill one field.

• If neither field is filled, the service also should not execute and prompt the user.

I'm currently thinking to use an expression function to validate the input combination and trigger a service on button click accordingly.

Before I finalize this logic, I’d love to hear your thoughts:

• Would there be a more elegant way to handle this validation and control flow (perhaps with validators or service parameter bindings)?

Appreciate any suggestions or shared experiences!

Thanks in advance,