Mandatory based on choice selection

  • 22 September 2022
  • 1 reply



I would like to make a field mandatory, but only when a certain selection is made within another field (a choice drop down). i.e. if the choice drop down states "X to Y", it prompts a person field to become mandatory. 


Hope that makes sense and is a simple rule. 


Thanks, Andy. 

1 reply

Userlevel 5
Badge +11

Which forms designer are you using? You can use a rule to accomplish this in either the Responsive or Classic designer.


Follow these steps in the Responsive designer:

  1. Add a rule to the person field.

  2. Configure the rule with these options:

    1. Rule Name = Require Person Field (or whatever you would like).

    2. When = and(equals(Department,"IT"),isNullOrEmpty(Employee))

      • Department is the choice field.

      • Employee is the person field.

    3. Then = Invalidate

    4. Validation Message = Please enter an Employee (or whatever you would like).

Let me know if you would like me to provide this configuration for a Classic form.