Drupal 7 Execute custom function when doing AJAX load

drupal.js

(function($) {
  Drupal.behaviors.contact = {
    attach: function (context, settings) {

      $('.webform-client-form input').attr('readonly', false);
      
      // Actions are stored in Drupal.ajax, every ajax call these identifiers might change.
      $.each(Drupal.ajax, function(k, v) {
        if(k.match(/edit-submitted-about/g)) { // The identifier I was aiming for was prefixed with "edit-submitted-about".
          Drupal.ajax[k].options.beforeSerialize = function(element, options) {
            Drupal.ajax.prototype.beforeSerialize(element, options);
            $('.webform-client-form input').attr('readonly', true);
          }

        }
      });

    };

  };
})(jQuery);