function _field_ui_field_overview_form_validate_add_existing

Validates the 'add existing field' row of field_ui_field_overview_form().

See also

field_ui_field_overview_form_validate()

File

drupal/modules/field_ui/field_ui.admin.inc, line 736

Administrative interface for custom field type creation.

Code

function _field_ui_field_overview_form_validate_add_existing($form, &$form_state) {

  // The form element might be absent if no existing fields can be added to
  // this bundle.
  if (isset($form_state['values']['fields']['_add_existing_field'])) {
    $field = $form_state['values']['fields']['_add_existing_field'];

    // Validate if any information was provided in the 'add existing field' row.
    if (array_filter(array(
      $field['label'],
      $field['field_name'],
      $field['widget_type'],
    ))) {

      // Missing label.
      if (!$field['label']) {
        form_set_error('fields][_add_existing_field][label', t('Add existing field: you need to provide a label.'));
      }

      // Missing existing field name.
      if (!$field['field_name']) {
        form_set_error('fields][_add_existing_field][field_name', t('Add existing field: you need to select a field.'));
      }

      // Missing widget type.
      if (!$field['widget_type']) {
        form_set_error('fields][_add_existing_field][widget_type', t('Add existing field: you need to select a widget.'));
      }
      elseif ($field['field_name'] && ($existing_field = field_info_field($field['field_name']))) {
        $widget_types = field_ui_widget_type_options($existing_field['type']);
        if (!isset($widget_types[$field['widget_type']])) {
          form_set_error('fields][_add_existing_field][widget_type', t('Add existing field: invalid widget.'));
        }
      }
    }
  }
}