<script>
  /** add active class and stay opened when selected */
var url = window.location;

// for sidebar menu entirely but not cover treeview
$('ul.sidebar-menu a').filter(function() {
   return this.href == url;
}).parent().addClass('active');

// for treeview
$('ul.treeview-menu a').filter(function() {
   return this.href == url;
}).parentsUntil(".sidebar-menu > .treeview-menu").addClass('active');
</script>
<script>
  $(document).ready(function () {
    $('.sidebar-menu').tree()
  })

</script>