code: public function isSubmitted() : bool
      {
          if (isset($_POST['validform'.$this->_oForm->getFormNumber()]) && $_POST['validform'.$this->_oForm->getFormNumber()] == 1) {
  
              return true;
          } else {
  
              return false;
          }
      }
docs: if this form is validate and save
  
  @access public
  @return boolean