themes/docsy/layouts/partials/sidebar-menu.html

<ul class="sidebar-menu">
    {{ range .catalog }}
    <li>
        {{if .catalog}}
            {{if .path}}
            <a href="{{ .path }}">{{ .name }}<i class="iconfont icon-arrow-right pull-right"></i></a>
            {{else}}
            <a href="#">{{ .name }}<i class="iconfont icon-arrow-right pull-right"></i></a>
            {{end}}

            {{ partial "sidebar-submenu.html" . }}
        {{else}}
            <a href="{{ .path }}">{{ .name }}</a>
        {{end}}
    </li>
    {{ end }}
</ul>
<script src="/js/sidebar-menu.js"></script>
<script>
  (function (){
    $.sidebarMenu($('.sidebar-menu'))
    var path = window.location.pathname;
    var hash = window.location.hash;
    var $a = $('.sidebar-menu a')
    $a.each(function (e){
      if($(this).attr('href')+'/' === path || $(this).attr('href').replace('#','/#') === path+hash){
        $(this).parents('li').addClass('active').show()
      }
    })
    $a.on('click',function (){
      var url = $(this).attr('href')
      if(url!=='#'){
        window.location.href = url
      }
    })
  })()
</script>