website/assets/js/app.js

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

$(function() {
  var LS = window.localStorage;
  var selected = LS['sidebar-selected'] || null;

  if (selected != null) {
    var selectedElement = '#' + selected;
    $(selectedElement).collapse('show');
    $('aside.hn-sidebar').scrollTo(selectedElement);
  }

  var tabs = $("[id^='collapse']");
  tabs.on('shown.bs.collapse', function() {
    LS['sidebar-selected'] = this.id;
  });

  tabs.on('hidden.bs.collapse', function() {
    LS['sidebar-selected'] = null;
  });
});