I am using it in the Change event of the checkbox. And that worked Perfect!  I knew i was missing something small.  what about the adding the =<1 ?

I am trying to make this where if this checkbox is checked then it checks to see if SSN has a correct number in it or it returns an error.This is what i have in there now.if (xfa.resolveNode("this").rawValue == "1"){     SSN.mandatory = "error";     app.alert("Please fill in the Dependent SSN portio...