How can I validate the user input in order to avoid certain strings as nodetitles?
Say I do not want to allow the user to create nodetitles that contain a comma … is there any way i can trigger a form_set_error() when the form is being validated?

Comments

tinker’s picture

tinker commented

You can do this by making your own module that alters the form. Its not easy if you are not a programmer. Replace anything beginning with "my" using the names you select for the module, content type, and field.

function mymodule_form_alter(&$form, &$form_state, $form_id) {
  switch ($form_id) {
    case 'mycontenttype_node_form':
      $form['#validate'][] = 'mymodule_mycontenttype_form_validate';
      break;
  }
}

function mymodule_mycontenttype_form_validate ($form, &$form_state) {
  if (strstr($form_state['values']['myfield']['value'], ",")) {
    form_set_error('myfield', t('This field cannot have commas'));
    $form_state['rebuild'] = TRUE;
  }
}