function book_helper_admin_edit_validate in Book helper 7

Same name and namespace in other branches

1. 6 book_helper.admin.inc \book_helper_admin_edit_validate()

Check that the book has not been changed while using the form.

See also

book_admin_edit()

File

./book_helper.admin.inc, line 161

Administration page for the 'Book helper' module.

Code

function book_helper_admin_edit_validate($form, &$form_state) {
  if ($form_state['values']['op'] == t('Save book pages') && $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.'));
  }
}