Tutorial: setmultientryfieldvalue-tutorial

To set the value of a multi entry field use setMultiEntryFieldValue(fieldname, value)

In the example below: set multientry field new_participants with values for each object in the array (fields person_name and person_number is expected to exist as fields in the multientry field)

// Example  
formsApi.setMultiEntryFieldValue(
        'new_participants', 
        [
            {"person_name": "Test Person 1", "person_number": 1234}, 
            {"person_name": "Second Person", "person_number": 9876}
        ]);