$(document).ready(function() {

$("form")..submit(function() {
  alert('Handler for .submit() called.');
  e.preventDefault();
  return false;
});

$("form")..submit(function(e) {
        alert('callback');
        
           var submitForm = true;
           var name = $("#CallBack_Name".).val();
           var num = $("#CallBack_Number".).val();

           if(name.length == 0) {
             alert('Please enter a valid name');
             submitForm = false;
           }
           if(num .length == 0) {
              alert('Please enter a valid number');
              submitForm = false;
           }

            if (submitForm ) {                
                return true;
            }
            else {
                //Prevent the submit event and remain on the screen
                e.preventDefault();
                return false;
            }

    });

});