function nd_build_mode_form_validate in Node displays 6

Validate new custom display submission.

File

includes/nd.buildmodes.inc, line 226

Manage build modes.

Code

function nd_build_mode_form_validate($form, &$form_state) {
  if ($form['#form_type'] == 'insert') {
    $existing = array_keys(nd_get_build_modes());
    if (in_array($form_state['values']['key'], $existing)) {
      form_set_error('key', t('This display mode already exists.'));
    }
    if (!preg_match('!^[a-z_]+$!', $form_state['values']['key'])) {
      form_set_error('key', t('The machine-readable name must contain only lowercase letters and underscores.'));
    }
  }
}