Set filename as a default value to image 'Alt' & 'Title' field

There is an issue with this patch when you are uploading multiple images into a field.

All the images get Alt text from the first image name.

This is with Drupal 9.5.10 and the Plupload Integration Module with unlimited number of images. Note that I don't think plupload is being used for the image field here.

Thanks,
Eric

Adding an attachment...

As this patch didn't work for us in Drupal 10.x, we've decided to handle this in a custom module. We're appending a custom callback in the widget hook for image_image and setting the default value of the alt tag there:

<?php
/**
 * Implements hook_field_widget_single_element_WIDGET_TYPE_form_alter() for image_image
 */
function mymodule_field_widget_single_element_image_image_form_alter(array &$element, \Drupal\Core\Form\FormStateInterface $form_state, array $context) {
  $element['#process'][] = "mymodule_image_widget_process";
}

/**
 * Prefill alt tags in image widget on upload
 */
function mymodule_image_widget_process($element, \Drupal\Core\Form\FormStateInterface $form_state, $form) {
  if (!empty($element['#files']) && $element['#preview_image_style']) {
    if (empty($element['alt']['#default_value'])) {
      $file = reset($element['#files']);
      $filename = pathinfo($file->getFileName(), PATHINFO_FILENAME);
      $clean = str_replace(array('-', '_'), ' ', $filename);
      $element['alt']['#default_value'] = $clean;
    }
  }

  return $element;
}

Hope this helps!

Adding accessibility and needs accessibility review tags. In my experience, file names are typically not appropriate as alt text.

dwisnousky → closed merge request !7352

Has an accessibility review been done on this issue?

The strongest possible -1 from an accessibility standpoint. This feature would encourage a bad practice that unfortunately is very popular on the Internet.

Noting that the filename coming from an iPhone is typically just IMG followed by a sequence number, something that is not accessible. I also see many image file names on our website that are gibberish.

As people above have already commented, this would be bad for accessibility. The purpose of the alt text is to describe the image, which a filename in most cases just doesn't do.