themes/docsy/layouts/partials/toc.html

{{ partial "page-meta-links.html" . }}
{{ if not .Params.notoc }}
{{ with .TableOfContents }}
{{ if ge (len .) 200 }}
{{ . }}
{{ end }}
{{ end }}
{{ end }}

<script>
  $(function () {
    var $toc = $("#TableOfContents");
    if (!$toc || !$toc.length) {
      return;
    }
    var top = $toc.offset().top;

    window.onscroll = debounce(setTop)

    function setTop() {
      var scrollValue = $(window).scrollTop();
      if (scrollValue >= top - 70) {
        $toc.addClass('fix')
      } else {
        $toc.removeClass('fix')
      }
    }

    function debounce(fn, wait = 200) {
      var timeout = null;
      return function () {
        clearTimeout(timeout);
        timeout = setTimeout(() => {
          fn.apply(this, arguments);
        }, wait);
      };
    }
  })

</script>