function my_mwform_value( $value, $name ){
  if( $name === 'clap_title' ){
    $name_value = get_the_title();
    return $name_value;
  }
  if( $name === 'clap_url'){
    $name_value = get_pagenum_link(get_query_var('page'));
    return $name_value;
  }
  return $value;
}
add_filter( 'mwform_value_mw-wp-form-7026', 'my_mwform_value', 10, 2 );