jquery imitates the floating navigation effect at the bottom of Baidu Encyclopedia

jquery is similar to the bottom navigation preview of Baidu Encyclopedia. The code is very simple, so there won’t be much nonsense here.

Rendering:

CSS

 * {
      margin: 0;
      padding: 0
    }

    .wrap {
      width: 1000px;
      overflow: hidden;
      margin: 0 auto;
    }

    .content {
      width: 780px;
      float: left;
    }

    .slide {
      width: 200px;
      float: right;
    }

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HTML

<div class="wrap">
<div class="content">
  <h2 class="headline-1">
    <a class="anchor-1" name="1"></a>
    <span class="headline-1-index">1</span>
    <span class="headline-content">part1</span>
  </h2>

  <div class="para">
    content1,content1
    <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
  </div>
  <h2 class="headline-1">
    <a class="anchor-1" name="2"></a>
    <span class="headline-2-index">2</span>
    <span class="headline-content">part2</span>
  </h2>

  <div class="para">
    content2,content2
    <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
  </div>
  <h2 class="headline-2">
    <a class="anchor-2" name="2-1"></a>
    <!--<span class="headline-2-index">2-1</span>-->
    <span class="headline-content">part2-1</span>
  </h2>

  <div class="para">
    content2-1,content2-1
    <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
  </div>
  <h2 class="headline-2">
    <a class="anchor-2" name="2-2"></a>
    <!--<span class="headline-1-index">2-2</span>-->
    <span class="headline-content">part2-2</span>
  </h2>

  <div class="para">
    content2-2,content2-2
    <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
  </div>
  <h2 class="headline-1">
    <a class="anchor-1" name="3"></a>
    <span class="headline-1-index">3</span>
    <span class="headline-content">part3</span>
  </h2>

  <div class="para3">
    content,content
    <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
  </div>
  <h2 class="headline-1">
    <a class="anchor-1" name="4"></a>
    <span class="headline-1-index">4</span>
    <span class="headline-content">part4</span>
  </h2>

  <div class="para4">
    content,content
    <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
  </div>
  <h2 class="headline-1">
    <a class="anchor-1" name="5"></a>
    <span class="headline-1-index">5</span>
    <span class="headline-content">part5</span>
  </h2>

  <div class="para">
    content5,content5
    <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
  </div>
  <h2 class="headline-1">
    <a class="anchor-1" name="6"></a>
    <span class="headline-1-index">6</span>
    <span class="headline-content">part6</span>
  </h2>

  <div class="para">
    content6,content6
    <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
  </div>
  <h2 class="headline-1">
    <a class="anchor-1" name="7"></a>
    <span class="headline-1-index">7</span>
    <span class="headline-content">part7</span>
  </h2>

  <div class="para">
    content7,content7
    <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
  </div>
  <h2 class="headline-1">
    <a class="anchor-1" name="8"></a>
    <span class="headline-1-index">8</span>
    <span class="headline-content">part8</span>
  </h2>

  <div class="para">
    content8,content8
    <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
  </div>
  <h2 class="headline-1">
    <a class="anchor-1" name="9"></a>
    <span class="headline-1-index">9</span>
    <span class="headline-content">part9</span>
  </h2>

  <div class="para">
    content9,content9
    <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
  </div>
  <h2 class="headline-1">
    <a class="anchor-1" name="10"></a>
    <span class="headline-1-index">10</span>
    <span class="headline-content">part10</span>
  </h2>

  <div class="para">
    content10,content10
    <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
  </div>
  <h2 class="headline-1">
    <a class="anchor-1" name="11"></a>
    <span class="headline-1-index">11</span>
    <span class="headline-content">part11</span>
  </h2>

  <div class="para">
    content11,content11
    <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
  </div>
  <h2 class="headline-1">
    <a class="anchor-1" name="12"></a>
    <span class="headline-1-index">12</span>
    <span class="headline-content">part12</span>
  </h2>

  <div class="para">
    content12,content12
    <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
  </div>
  <h2 class="headline-1">
    <a class="anchor-1" name="13"></a>
    <span class="headline-1-index">13</span>
    <span class="headline-content">part13</span>
  </h2>

  <div class="para">
    content13,content13
    <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
  </div>
  <h2 class="headline-1">
    <a class="anchor-1" name="14"></a>
    <span class="headline-1-index">14</span>
    <span class="headline-content">part14</span>
  </h2>

  <div class="para">
    content14,content14
    <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
  </div>
  <h2 class="headline-1">
    <a class="anchor-1" name="15"></a>
    <span class="headline-1-index">15</span>
    <span class="headline-content">part15</span>
  </h2>

  <div class="para">
    content15,content15
    <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
    <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
    bottom
  </div>
</div>
<div class="slide" >
  <div id="sideToolbar" style="position: fixed; bottom: 0">
    <div id="sideCatalog" class="sideCatalogBg" style="visibility: visible;">
      <div id="sideCatalog-sidebar">
        <div class="sideCatalog-sidebar-top"></div>
        <div class="sideCatalog-sidebar-bottom"></div>
      </div>
      <div id="sideCatalog-updown" style="visibility: visible;">
        <div id="sideCatalog-up" class="sideCatalog-up-disable" title="向上翻页"></div>
        <div id="sideCatalog-down" class="sideCatalog-down-enable" title="向下翻页"></div>
      </div>
      <div id="sideCatalog-catalog">
        <dl style="width:175px;zoom:1">
          <!--
          <dd id="sideToolbar-item-0-1" class="sideCatalog-item2 heightlight">
            <span class="sideCatalog-index1">1</span>
            <a class="nslog:1026" onclick="return false;" title="part1" href="#1">part1</a>
            <span class="sideCatalog-dot"></span>
          </dd>
          <dd id="sideToolbar-item-0-2" class="sideCatalog-item1">
            <span class="sideCatalog-index1">2</span>
            <a class="nslog:1026" onclick="return false;" title="part2" href="#2">part2</a>
            <span class="sideCatalog-dot"></span>
          </dd>
          <dd id="sideToolbar-item-0-2-1" class="sideCatalog-item2">
            <span class="sideCatalog-index1">2-1</span>
            <a class="nslog:1026" onclick="return false;" title="part2" href="#2-1">part2-1</a>
            <span class="sideCatalog-dot"></span>
          </dd>
          -->
        </dl>
      </div>
    </div>
    <a id="sideCatalogBtn" class="" style="visibility: visible;" href="javascript:void(0);"></a>
    <a id="sideToolbar-up" style="visibility: visible;" title="返回顶部" href="javascript:void(0)"></a>
  </div>
</div>
</div>

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<script>
  var allEle = $(':header[class*="headline"]');
  var headLen = allEle.length;
  var ddArr = [];
  //根据页面内容生成slide导航；
  allEle.each(function(i){
    var sideIndex,
      sideName,
      ddId,
      highlight='',
      ddClass,
      sideAnchor;
    sideName = $(this).find('.headline-content').text();
    if($(this).hasClass('headline-1')){
      sideAnchor = sideIndex = $(this).find('.anchor-1').eq(0).attr('name');
      ddClass = 'sideCatalog-item1';
    }else{
      sideAnchor = $(this).find('.anchor-2').eq(0).attr('name');
      sideIndex = sideAnchor.replace('-','.');
      ddClass = 'sideCatalog-item2';
    }
    ddId = 'sideToolbar-item-0-'+ sideAnchor;
    if(i==0){
      highlight = 'highlight';
    }
    var ddHtml = '<dd id="'+ ddId +'" class="'+ddClass + ' ' + highlight +'">'
        +    '<span class="sideCatalog-index1">'+ sideIndex +'</span>'
        +    '<a class="nslog:1026" onclick="return false;" title="part'+sideAnchor+'" href="#'+sideAnchor+'">'+ sideName +'</a>'
        +    '<span class="sideCatalog-dot"></span>'
        +  '</dd>';
    ddArr.push(ddHtml);
  });
  $('#sideCatalog-catalog dl').html(ddArr.join(''));

  //设置导航的位置
  var slideTop = $(window).height() - $('.slide').height();
  $('.slide').css('top',slideTop);

  var slideInnerHeight = $('#sideCatalog-catalog dl').height();
  var slideOutHeight = $('#sideCatalog-catalog').height();
  var enableTop = slideInnerHeight - slideOutHeight;
  var step = 50;
  //点击向上的按钮
  $('#sideCatalog-down').bind('click', function () {
    if ($(this).hasClass('sideCatalog-down-enable')) {
      if ((enableTop - Math.abs(parseInt($('#sideCatalog-catalog dl').css('top')))) > step) {
        $('#sideCatalog-catalog dl').stop().animate({'top': '-=' + step}, 'fast');
        $('#sideCatalog-up').removeClass('sideCatalog-up-disable').addClass('sideCatalog-up-enable');
      } else {
        $('#sideCatalog-catalog dl').stop().animate({'top': -enableTop}, 'fast');
        $(this).removeClass('sideCatalog-down-enable').addClass('sideCatalog-down-disable');
      }
    } else {
      return false;
    }
  })
  //点击向下的按钮
  $('#sideCatalog-up').bind('click', function () {
    if ($(this).hasClass('sideCatalog-up-enable')) {
      if (Math.abs(parseInt($('#sideCatalog-catalog dl').css('top'))) > step) {
        $('#sideCatalog-catalog dl').stop().animate({'top': '+=' + step}, 'fast');
        $('#sideCatalog-down').removeClass('sideCatalog-down-disable').addClass('sideCatalog-down-enable');
      } else {
        $('#sideCatalog-catalog dl').stop().animate({'top': '0'}, 'fast');
        $(this).removeClass('sideCatalog-up-enable').addClass('sideCatalog-up-disable');
      }
    } else {
      return false;
    }
  })

  //点击导航中的各个目录
  $('#sideCatalog-catalog dl').delegate('dd', 'click', function () {
    var index = $('#sideCatalog-catalog dl dd').index($(this));
    scrollSlide($(this), index);
    var ddIndex = $(this).find('a').stop().attr('href').lastIndexOf('#');
    var ddId = $(this).find('a').stop().attr('href').substring(ddIndex+1);
    var windowTop = $('a[name="' + ddId + '"]').offset().top;
    $('body,html').animate({scrollTop: windowTop}, 'fast');
  })

  //滚动页面，即滚动条滚动
  $(window).scroll(function () {
    if($(this).scrollTop()>$(this).height()){
      $('.slide').show();
    }else{
      $('.slide').hide();
    }
    for (var i=headLen-1; i>=0; i--) {
      if ($(this).scrollTop() >=allEle.eq(i).offset().top - allEle.eq(i).height()) {
        var index = i;
        $('#sideCatalog-catalog dl dd').eq(index).addClass('highlight').siblings('dd').removeClass('highlight');
        scrollSlide($('#sideCatalog-catalog dl dd').eq(index), index);
        return false;
      } else {
        $('#sideCatalog-catalog dl dd').eq(0).addClass('highlight').siblings('dd').removeClass('highlight');
      }
    }
  })

  //导航的滚动，以及向上，向下按钮的显示隐藏
  function scrollSlide(that, index){
    if (index < 5) {
      $('#sideCatalog-catalog dl').stop().animate({'top': '0'}, 'fast');
      $('#sideCatalog-down').removeClass('sideCatalog-down-disable').addClass('sideCatalog-down-enable');
      $('#sideCatalog-up').removeClass('sideCatalog-up-enable').addClass('sideCatalog-up-disable');
    } else if (index > 11) {
      $('#sideCatalog-catalog dl').stop().animate({'top': -enableTop}, 'fast');
      $('#sideCatalog-down').removeClass('sideCatalog-down-enable').addClass('sideCatalog-down-disable');
      $('#sideCatalog-up').removeClass('sideCatalog-up-disable').addClass('sideCatalog-up-enable');
    } else {
      var dlTop = parseInt($('#sideCatalog-catalog dl').css('top')) + slideOutHeight / 2 - (that.offset().top - $('#sideCatalog-catalog').offset().top);
      $('#sideCatalog-catalog dl').stop().animate({'top': dlTop}, 'fast');
      $('#sideCatalog-down').removeClass('sideCatalog-down-disable').addClass('sideCatalog-down-enable');
      $('#sideCatalog-up').removeClass('sideCatalog-up-disable').addClass('sideCatalog-up-enable');
    }
  }

  //置顶
  $('#sideToolbar-up').bind('click', function(){
    $('body,html').animate({scrollTop: 0}, 'fast');
  })

  //slide内容的显示与隐藏
  $('#sideCatalogBtn').bind('click', function(){
    if($(this).hasClass('sideCatalogBtnDisable')){
      $(this).removeClass('sideCatalogBtnDisable');
      $('#sideCatalog').css('visibility','visible');
    }else{
      $(this).addClass('sideCatalogBtnDisable');
      $('#sideCatalog').css('visibility','hidden');
    }
  })

</script>

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jquery imitates the floating navigation effect at the bottom of Baidu Encyclopedia_jquery