Drupal - Control ajax call on submit button by returning true or false in beforesubmit function

ajax_before_submit.txt

// Get all the elements in the DOM with ajax enabled
for (var ajax_element in Drupal.ajax) {
  if (typeof Drupal.ajax[ajax_element] !== 'undefined') {
    // Drupal.ajax[ajax_elements].ajaxing = false;

    // Get the actual jquery object for the submit button
    var $ajax_el_obj = jQuery(Drupal.ajax[ajax_element].element);

    // Check if it's reqd. button and then call beforesubmit for that
    if($ajax_el_obj.attr('id') == 'edit-submit'){
      console.log('second step button');
      Drupal.ajax[ajax_element].options.beforeSubmit = function (form_values, element, options) 
      {
        // Check reqd. validations or conditions and return true/false
        return false;
      };


    }

  }
}