public function Page::validateOptionsForm in Views (for Drupal 7) 8.3
Validate the options form.
Overrides DisplayPluginBase::validateOptionsForm
File
- lib/Drupal/ views/ Plugin/ views/ display/ Page.php, line 564 
- Definition of Drupal\views\Plugin\views\display\Page.
Class
- Page
- The plugin that handles a full page.
Namespace
Drupal\views\Plugin\views\displayCode
public function validateOptionsForm(&$form, &$form_state) {
  // It is very important to call the parent function here:
  parent::validateOptionsForm($form, $form_state);
  switch ($form_state['section']) {
    case 'path':
      if (strpos($form_state['values']['path'], '$arg') !== FALSE) {
        form_error($form['path'], t('"$arg" is no longer supported. Use % instead.'));
      }
      if (strpos($form_state['values']['path'], '%') === 0) {
        form_error($form['path'], t('"%" may not be used for the first segment of a path.'));
      }
      // automatically remove '/' and trailing whitespace from path.
      $form_state['values']['path'] = trim($form_state['values']['path'], '/ ');
      break;
    case 'menu':
      $path = $this
        ->getOption('path');
      if ($form_state['values']['menu']['type'] == 'normal' && strpos($path, '%') !== FALSE) {
        form_error($form['menu']['type'], t('Views cannot create normal menu items for paths with a % in them.'));
      }
      if ($form_state['values']['menu']['type'] == 'default tab' || $form_state['values']['menu']['type'] == 'tab') {
        $bits = explode('/', $path);
        $last = array_pop($bits);
        if ($last == '%') {
          form_error($form['menu']['type'], t('A display whose path ends with a % cannot be a tab.'));
        }
      }
      if ($form_state['values']['menu']['type'] != 'none' && empty($form_state['values']['menu']['title'])) {
        form_error($form['menu']['title'], t('Title is required for this menu type.'));
      }
      break;
  }
}