Infopath > If select No boolean only then make comments field mandatory

Question

Okay, I need to make the comments field in infopath form required only if they select "Reject" a Boolean field. How is it possible?

Answer 1

This is how I would do it,

Let's say I have a form like this, where the Approval Status drop down list takes (Pending, Approved, Rejected):

Then, I can apply a data validation like so,

Answer 2

Actually, the link I provided earlier did work:

SharePoint for Designers: Creating Conditonally Required Fields in InfoPath

Answer 3

• First, make the Comments field mandatory.
• Then, add a new Action to your form: When "Rejected" choosen, set the Comments field value: Comments Value = Comments Value + " ".