Question

You are developing client scripting for a model-driven app account form. Requirements: when the user changes the 'Primary Contact' lookup, you must immediately requery a related phone number and populate a text field, but this logic must NOT run when the form first loads with an existing record. You have written a JavaScript function that performs the requery. How should you register the handler so it meets the requirement using supported approaches?

Accepted Answer

Register the function on the OnChange event of the Primary Contact column, using the form event handler registration in the form designer.

Answer

Register the function on the form OnLoad event and inside it call formContext.data.entity.attributes for the lookup value.

Answer

Register the function on the form OnSave event so it fires whenever the record is committed.

Answer

Add addOnChange to the lookup inside the OnLoad handler, but also fire the handler manually during OnLoad using fireOnChange.