Custom form-tag

Hi!

With CF7 you can create your own custom form tags.

In my case, it’s a hidden selection tag to list my cart items and send this with a form, according to the documentation:

add_action( 'wpcf7_init', 'custom_add_form_tag' );

function custom_add_form_tag() {
  wpcf7_add_form_tag( 'selection', 'custom_selection_tag' );
}

function custom_selection_tag( $tag ) {
  global $selection;

  foreach ($selection as $s) {
    $titles[] = get_the_title($s);
  }

  $datalist = '';

  foreach ( $selection as $val ) {

    $datalist .= sprintf(
      '<input %s />',
      wpcf7_format_atts( array(
        'type' => 'hidden',
        'name' => 'selection[]',
        'checked' => 'checked',
        'value' => get_the_title($val),
     ))
    );
  }

  return $datalist;
}

But, the filed is not displayed on the Airtable tab list. Only the CF7 form-tags by default appears.