Club Drupal

/**

 * Implements hook_field_widget_form_alter().

 */

function bootstrap_field_widget_form_alter(&$element, &$form_state, $context) {

  $widget_type = isset($context['instance']['widget']['type']) ? $context['instance']['widget']['type'] : NULL;

  if ($widget_type === 'image_image') {

    foreach (element_children($element) as $child) {

      $element[$child]['#process'][] = '_bootstrap_image_field_widget_process';

    }

  }

}

/**

 * Implements above #process callback.

 */

function _bootstrap_image_field_widget_process($element, &$form_state, $form) {

  // Core explicitly sets #theme_wrappers to an empty array for the upload

  // element (perhaps for styling reasons?). Thus, bootstrap_form_element() is

  // invoked, preventing any necessary logic from executing. To achieve the

  // same goal and keep backwards compatibility, reset the theme wrapper back

  // and indicating that the wrapper shouldn't be printed.

  $element['upload']['#theme_wrappers'][] = 'form_element__image_widget';

  $element['upload']['#form_element_wrapper'] = FALSE;

  // Unfortunately, core also doesn't set #access on the appropriate elements

  // until way too late (ironically, because of #ajax). Instead of calling

  // file_managed_file_pre_render(), just mimic the same #access logic, but

  // using #default_value instead of #value since the ajax request populates

  // #value.

  $value = empty($element['#default_value']['fid']);

  if (!$value) {

    $element['upload']['#access'] = FALSE;

    $element['upload_button']['#access'] = FALSE;

  }

  // If we don't already have a file, there is nothing to remove.

  else {

    $element['remove_button']['#access'] = FALSE;

  }

  // Make the upload file element an input group with a button.

  $element['upload']['#input_group_button'] = $value;

  return $element;

}