function book_admin_edit_validate
7.x book.admin.inc | book_admin_edit_validate($form, &$form_state) |
6.x book.admin.inc | book_admin_edit_validate($form, &$form_state) |
Check that the book has not been changed while using the form.
See also
File
- drupal-6.x/
modules/ book/ book.admin.inc, line 87 - Admin page callbacks for the book module.
Code
function book_admin_edit_validate($form, &$form_state) {
if ($form_state['values']['tree_hash'] != $form_state['values']['tree_current_hash']) {
form_set_error('', t('This book has been modified by another user, the changes could not be saved.'));
$form_state['rebuild'] = TRUE;
}
}