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   1. drupal6
   2. drupal7

Validate the book settings form.

See also

book_admin_settings()

Code

modules/book/book.admin.inc, line 57

<?php
function book_admin_settings_validate($form, &$form_state) {
  $child_type = $form_state['values']['book_child_type'];
  if (empty($form_state['values']['book_allowed_types'][$child_type])) {
    form_set_error('book_child_type', t('The content type for the %add-child link must be one of those selected as an allowed book outline type.', array('%add-child' => t('Add child page'))));
  }
}
?>