2

I have added a custom field "Buy Now" link on media edit page but I am not able to save that data like other post types. Is there any other hook which is triggered after add/edit/update media/attachment?

I am using this function:

function update_attachment_extra_info( $post_id ) {

   // code to update data


}
add_action( 'save_post', 'update_attachment_extra_info' );

But this hook is not triggered.

4
  • Could you please edit your question and include the code that adds the Buy Now field? Feb 14, 2017 at 21:13
  • Actually, I am using save_post hook but when I try to update , this hook was not called. Feb 14, 2017 at 21:16
  • The hooks attachment_fields_to_edit, edit_attachment, and wp_ajax_save-attachment-compat are what you'll need. The code from this question works, and can easily be adapted: wordpress.stackexchange.com/questions/180092/… Feb 14, 2017 at 21:24
  • Happy to help! I reviewed the code from the question I linked a bit closer and found that the non-ajax part was not correct, so I added the revised code as an answer. Feb 14, 2017 at 21:56

1 Answer 1

6

Here is an example that adds a custom media field named Buy Now. This example saves the value of the custom field on the media overlay screen via ajax, as well as the media edit screen (non ajax).

Edit: Added nonce check and sanitization.

/**
 * Add custom field to media.
 */
add_filter( 'attachment_fields_to_edit', 'wpse256463_attachment_fields', 10, 2 );
function wpse256463_attachment_fields( $fields, $post ) {
    $meta = get_post_meta( $post->ID, 'buy_now', true );

    $fields['buy_now'] = [
      'label'        => __( 'Buy Now', 'text-domain' ),
      'input'        => 'text',
      'value'        => $meta,
      'show_in_edit' => true,
      'extra_rows'   => [
        'nonce' => wp_nonce_field(
          'update_attachment_buy_now', // Action.
          'nonce_attachment_buy_now', // Nonce name.
          true, // Output referer?
          false // Echo?
        ),
      ],
    ];

    return $fields;
}

/**
 * Update custom field within media overlay (via ajax).
 */
add_action( 'wp_ajax_save-attachment-compat', 'wpse256463_media_fields', 0, 1 );
function wpse256463_media_fields() {
  $nonce = $_REQUEST['nonce_attachment_buy_now'] ?? false;

  // Bail if the nonce check fails.
  if ( empty( $nonce ) || ! wp_verify_nonce( $nonce, 'update_attachment_buy_now' ) ) {
    return;
  }

  // Bail if the post ID is empty.
  $post_id = intval( $_POST['id'] );
  if ( empty( $post_id ) ) {
    return;
  }

  // Update the post.
  $meta = $_POST['attachments'][ $post_id ]['buy_now'] ?? '';
  $meta = wp_kses_post( $meta );
  update_post_meta( $post_id, 'buy_now', $meta );

  clean_post_cache( $post_id );
}

/**
 * Update media custom field from edit media page (non ajax).
 */
add_action( 'edit_attachment', 'wpse256463_update_attachment_meta', 1 );
function wpse256463_update_attachment_meta( $post_id ) {
  $nonce = $_REQUEST['nonce_attachment_buy_now'] ?? false;

  // Bail if the nonce check fails.
  if ( empty( $nonce ) || ! wp_verify_nonce( $nonce, 'update_attachment_buy_now' ) ) {
    return;
  }

  $buy_now = isset( $_POST['attachments'][ $post_id ]['buy_now'] )
    ? wp_kses_post( $_POST['attachments'][ $post_id ]['buy_now'] )
    : false;

  update_post_meta( $post_id, 'buy_now', $buy_now );

  return;
}
    
3
  • 1
    thanks it saves my day!
    – bdalina
    Dec 16, 2019 at 3:38
  • 1
    That is working great. I was wondering how can I approach checking nonce for those two actions. I know how to check it when I created it, but this one is something that WP created. Jul 26, 2021 at 13:47
  • 1
    @ChrisCynarski I added a nonce to the field and checks when saving for both methods. Also added sanitization. I wasn't able to figure out how to successfully verify the nonce sent by WP when saving the fields, so I added my own which I think might be the best way to go here anyway. Jul 30, 2021 at 21:18

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