How to save custom fields for attachments

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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.

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.

• custom-field
• attachments
• media-library

Share Improve this question edited Feb 14, 2017 at 21:58 Dave Romsey 17.9k1111 gold badges5656 silver badges7070 bronze badges asked Feb 14, 2017 at 17:59 shishir mishrashishir mishra 40655 silver badges1010 bronze badges 4

• Could you please edit your question and include the code that adds the Buy Now field? – Dave Romsey Commented Feb 14, 2017 at 21:13
• Actually, I am using save_post hook but when I try to update , this hook was not called. – shishir mishra Commented 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/questions/180092/… – Dave Romsey Commented 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. – Dave Romsey Commented Feb 14, 2017 at 21:56

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1 Answer 1

Sorted by: Reset to default 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;
}
    

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