I'm using a Submission Form Data Page to let my teachers Schedule A Class for their students. I have a calculated field for the number of classes left in the student's account. This field is a Virtual Field in the Data Page. I would like to Hide or Disable the Submit button and display a Warning Message when that field becomes zero.  Is there a way to do this without using JavaScript? If not, can someone please help me with JS because I don't have any experience using it.