--- /dev/null
+/**
+ * Implements hook_field_attach_validate().
+ */
+function {{ machine_name }}_field_attach_validate($entity_type, $entity, &$errors) {
+ // Make sure any images in article nodes have an alt text.
+ if ($entity_type == 'node' && $entity->type == 'article' && !empty($entity->field_image)) {
+ foreach ($entity->field_image as $langcode => $items) {
+ foreach ($items as $delta => $item) {
+ if (!empty($item['fid']) && empty($item['alt'])) {
+ $errors['field_image'][$langcode][$delta][] = array(
+ 'error' => 'field_example_invalid',
+ 'message' => t('All images in articles need to have an alternative text set.'),
+ );
+ }
+ }
+ }
+ }
+}