We're looking to convert the what used to work for validating that the comment box is not blank when a user is rejecting a form no longer works in the new designer, as stated in the documentation for the new form designer.  

$(document).ready(function () {

   $(".Reject").click(function () {
   
        if ($("#comments").val() == "") {
            alert("Please enter a comment before selecting this action");
            return false;
        }
    });
  
}

We're wanting a new forms editor js version of this, that we would think should look something like this 

LFForm.onFormSubmission(function () {
	
  
  if(LFForm.findFieldsByClassName("comments") == "" )(
    alert('Please enter a comment before selecting this action')
    return false;
  )  

  //console.log(LFForm.findFieldsById("comments"));

});

Except onFormSubmission doesn't seem to be getting triggered and there doesn't appear to be an onclick event yet supported to just check for a '.Reject' to be clicked.