code: function() {
  
                      // Removes the hover class from the previous drop down option
                      self.listItems.not($(this)).removeAttr("data-active");
  
                      $(this).attr("data-active", "");
  
                      var listIsHidden = self.list.is(":hidden");
  
                      if((self.options["searchWhenHidden"] && listIsHidden) || self.options["aggressiveChange"] || (listIsHidden && self.options["selectWhenHidden"])) {
  
                          self._update($(this));
  
                      }
  
                      // Adds the focus CSS class to the currently focused dropdown list option
                     $(this).addClass(focusClass);
  
                  }
docs: Delegates the `focusin` event with the `selectBoxIt` namespace to the list items