/** * {@inheritDoc} */ public function openTag(FormInterface $form = null) { if ($form) { if (!$form->hasAttribute('role')) { $form->setAttribute('role', 'form'); } $class = $form->getAttribute('class'); if (strpos($class, 'form-horizontal') === false && strpos($class, 'form-inline') === false) { $form->setAttribute('class', trim("{$this->defaultClass} {$class}")); } } return parent::openTag($form); }