/**
* @since 3.0
* get the class name for the element wrapping dom object
* @return string of class names
*/
protected function containerClass($element)
{
$c = explode(' ', parent::containerClass($element));
$params = $this->getParams();
$c[] = 'mode-' . $params->get('database_join_display_type', 'dropdown');
return implode(' ', $c);
}
