FacetWP automatically generates a permalink URL whenever you interact with facets. This allows you to bookmark the page with the facets in place.

However, when navigating to other pages on your site, the facet selections are lost. Fortunately, it’s possible to preserve the facets’ state across pages, by using cookies:

add_action( 'wp_footer', function() {
  ?>
    <script>
      (function($) {
        $(function() {

          /*
          After FacetWP reloads, store any updates into a cookie
          */

          $(document).on('facetwp-loaded', function() {
            var date = new Date();
            var facets = window.location.search;
            date.setTime(date.getTime()+(24*60*60*1000));
            document.cookie = "facetdata="+facets+"; expires="+date.toGMTString()+"; path=/";
          });

          /*
          When FacetWP first initializes, look for the "facetdata" cookie
          If it exists, set window.location.search= facetdata
          */

          $(document).on('facetwp-refresh', function() {
            if (! FWP.loaded) {
              var facets = window.location.search;
              var facetdata = readCookie('facetdata');
              if (null != facetdata && '' != facetdata && facets != facetdata) {
                document.cookie = 'facetdata=; expires=Thu, 01 Jan 1970 00:00:01 GMT; path=/';
                window.location.search = facetdata;
              }
            }
          });

          /*
          Cookie handler
          */
          function readCookie(name) {
            var nameEQ = name + "=";
            var ca = document.cookie.split(';');
            for(var i=0;i < ca.length;i++) {
              var c = ca[i];
              while (c.charAt(0)==' ') c = c.substring(1,c.length);
              if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
            }
            return null;
          }
        });
      })(jQuery);
    </script>
  <?php
}, 100 );

See also