Function to set the form invalid if a text box is empty

        var checkEmpty = function () {
            var formInvalid = false;
               if ($("#UserRole").val() === '') {
                   formInvalid = true;
               }
            if (formInvalid) {
                alert('The fields is empty. Please Enter the User Role');
                return false;
            }
            else
                return true;

        }