class
Script
{
  static
  main ()
  {
    const url = new URL (window.location.href);

    const orderAsc = document.getElementById ('order-asc');
    const filterKeyword = document.getElementById ('filter-keyword');

    const btnFilter = document.getElementById ('btn-filter');

    const filter = (
        function (e)
        {
          url.searchParams.delete ('p');

          url.searchParams.delete ('asc');
          url.searchParams.append ('asc', orderAsc.checked ? '1' : '0');

          url.searchParams.delete ('q');
          url.searchParams.append ('q', filterKeyword.value);

          window.location.href = url;
        });

    filterKeyword.addEventListener ('keydown',
        function (e)
        {
          if (e.key === 'Enter')
            filter (e);
        });

    btnFilter.addEventListener ('click', filter);
  }

  static
  jumpTo (page)
  {
    const url = new URL (window.location.href);

    url.searchParams.delete ('p');
    url.searchParams.append ('p', page);

    window.location.href = url;
  }
}


Script.main ();