public function onMarkRead()
 {
     if (($id = post('id')) != '') {
         if ($notification = Notification::find($id)) {
             $notification->markAsRead();
         }
     }
     $count = $this->getUnreadCount();
     $count = $count > 0 ? $count : '';
     $this->prepareVars();
     return ['#notification-counter .badge' => $count];
 }