目录
  1. WIKI教程
  2. 学习Bootstrap
  3. Bootstrap - Scrollspy插件( Scrollspy Plugin)

Bootstrap - Scrollspy插件( Scrollspy Plugin)

Scroll间谍（自动更新导航）插件允许您根据滚动位置定位页面的各个部分。 在其基本实现中，滚动时，可以根据滚动位置向导航栏添加.active类。

如果要单独包含此插件功能，则需要scrollspy.js 。 另外，如Bootstrap插件概述一章所述，您可以包含bootstrap.js或缩小的bootstrap.min.js 。

用法 (Usage)

您可以将滚动行为添加到顶部栏导航 -

  • Via data attributes - 将data-spy = "scroll"到您想要侦听的元素（通常是正文）。 然后使用任何Bootstrap .nav组件的父元素的ID或类添加属性data-target 。 为此，您必须在页面正文中包含与您正在监视的链接的匹配ID的元素。 

<body data-spy = "scroll" data-target = ".navbar-example">
   ...
   <div class = "navbar-example">
      <ul class = "nav nav-tabs">
         ...
      </ul>
   </div>
   ...
</body>

  • Via JavaScript - 您可以使用JavaScript调用scrollspy而不是使用数据属性，通过选择要监视的元素，然后调用.scrollspy()函数 - 

$('body').scrollspy({ target: '.navbar-example' })

例子 (Example)

以下示例显示了通过数据属性使用scrollspy插件 - 

<nav id = "navbar-example" class = "navbar navbar-default navbar-static" role = "navigation">
   <div class = "navbar-header">
      <button class = "navbar-toggle" type = "button" data-toggle = "collapse" 
         data-target = ".bs-js-navbar-scrollspy">
         <span class = "sr-only">Toggle navigation</span>
         <span class = "icon-bar"></span>
         <span class = "icon-bar"></span>
         <span class = "icon-bar"></span>
      </button>
      <a class = "navbar-brand" href = "#">Tutorial Name</a>
   </div>
   <div class = "collapse navbar-collapse bs-js-navbar-scrollspy">
      <ul class = "nav navbar-nav">
         <li><a href = "#ios">iOS</a></li>
         <li><a href = "#svn">SVN</a></li>
         <li class = "dropdown">
            <a href = "#" id = "navbarDrop1" class = "dropdown-toggle" data-toggle = "dropdown">
               Java
               <b class = "caret"></b>
            </a>
            <ul class = "dropdown-menu" role = "menu" aria-labelledby = "navbarDrop1">
               <li><a href = "#jmeter" tabindex = "-1">jmeter</a></li>
               <li><a href = "#ejb" tabindex = "-1">ejb</a></li>
               <li class = "divider"></li>
               <li><a href = "#spring" tabindex = "-1">spring</a></li>
            </ul>
         </li>
      </ul>
   </div>
</nav>
<div data-spy = "scroll" data-target = "#navbar-example" data-offset = "0" 
   style = "height:200px; overflow:auto; position: relative;">
   <h4 id = "ios">iOS</h4>
   <p>iOS is a mobile operating system developed and distributed by Apple 
      Inc. Originally released in 2007 for the iPhone, iPod Touch, and Apple 
      TV. iOS is derived from OS X, with which it shares the Darwin 
      foundation. iOS is Apple's mobile version of the OS X operating system 
      used on Apple computers.</p>
   <h4 id = "svn">SVN</h4>
   <p>Apache Subversion which is often abbreviated as SVN, is a software 
      versioning and revision control system distributed under an open source 
      license. Subversion was created by CollabNet Inc. in 2000, but now it 
      is developed as a project of the Apache Software Foundation, and as 
      such is part of a rich community of developers and users.</p>
   <h4 id = "jmeter">jMeter</h4>
   <p>jMeter is an Open Source testing software. It is 100% pure Java 
      application for load and performance testing.</p>
   <h4 id = "ejb">EJB</h4>
   <p>Enterprise Java Beans (EJB) is a development architecture for building 
      highly scalable and robust enterprise level applications to be deployed 
      on J2EE compliant Application Server such as JBOSS, Web Logic etc.</p>
   <h4 id = "spring">Spring</h4>
   <p>Spring framework is an open source Java platform that provides 
      comprehensive infrastructure support for developing robust Java 
      applications very easily and very rapidly.</p>
   <p>Spring framework was initially written by Rod Johnson and was first 
      released under the Apache 2.0 license in June 2003.</p>
</div>
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选项 (Options)

选项可以通过数据属性或JavaScript传递。 下表列出了选项 -

选项名称 类型/默认值 数据属性名称 描述
offset 数字Default: 10 data-offset 在计算滚动位置时从顶部偏移的像素。

方法 (Methods)

.scrollspy('refresh') - 通过JavaScript方法调用scrollspy时，需要调用.refresh方法来更新DOM。 如果DOM的任何元素已更改，即如果您添加或删除了某些元素，这将非常有用。 以下是使用此方法的语法。 

$('[data-spy = "scroll"]').each(function () {
   var $spy = $(this).scrollspy('refresh')
})

例子 (Example)

以下示例演示了.scrollspy('refresh')方法的使用 - 

<nav id = "myScrollspy" class = "navbar navbar-default navbar-static" role = "navigation">
   <div class = "navbar-header">
      <button class = "navbar-toggle" type = "button" data-toggle = "collapse" 
         data-target = ".bs-js-navbar-scrollspy">
         <span class = "sr-only">Toggle navigation</span>
         <span class = "icon-bar"></span>
         <span class = "icon-bar"></span>
         <span class = "icon-bar"></span>
      </button>
      <a class = "navbar-brand" href = "#">Tutorial Name</a>
   </div>
   <div class = "collapse navbar-collapse bs-js-navbar-scrollspy">
      <ul class = "nav navbar-nav">
         <li class = "active"><a href = "#ios">iOS</a></li>
         <li><a href = "#svn">SVN</a></li>
         <li class = "dropdown">
            <a href = "#" id = "navbarDrop1" class = "dropdown-toggle" data-toggle  = "dropdown">
               Java 
               <b class = "caret"></b>
            </a>
            <ul class = "dropdown-menu" role = "menu" aria-labelledby = "navbarDrop1">
               <li><a href = "#jmeter" tabindex = "-1">jmeter</a></li>
               <li><a href = "#ejb" tabindex = "-1">ejb</a></li>
               <li class = "divider"></li>
               <li><a href = "#spring" tabindex = "-1">spring</a></li>
            </ul>
         </li>
      </ul>
   </div>
</nav>
<div data-spy = "scroll" data-target = "#myScrollspy" data-offset = "0"  
   style = "height:200px; overflow:auto; position: relative;">
   <div class = "section">
      <h4 id = "ios">iOS<small><a href = "#" onclick = "removeSection(this);">
         × Remove this section</a></small>
      </h4>
      <p>iOS is a mobile operating system developed and distributed by 
         Apple Inc. Originally released in 2007 for the iPhone, iPod Touch, and 
         Apple TV. iOS is derived from OS X, with which it shares the Darwin 
         foundation. iOS is Apple's mobile version of the OS X operating system
         used on Apple computers.</p>
   </div>
   <div class = "section">
      <h4 id = "svn">SVN<small></small></h4>
      <p>Apache Subversion which is often abbreviated as SVN, is a software 
         versioning and revision control system distributed under an open source 
         license. Subversion was created by CollabNet Inc. in 2000, but 
         now it is developed as a project of the Apache Software Foundation, 
         and as such is part of a rich community of developers and users.</p>
   </div>
   <div class = "section">
      <h4 id = "jmeter">jMeter<small><a href = "#" onclick = "removeSection(this);">
         × Remove this section</a></small>
      </h4>
      <p>jMeter is an Open Source testing software. It is 100% pure Java 
         application for load and performance testing.</p>
   </div>
   <div class = "section">
      <h4 id = "ejb">EJB</h4>
      <p>Enterprise Java Beans (EJB) is a development architecture for 
         building highly scalable and robust enterprise level applications 
         to be deployed on J2EE compliant Application Server such as 
         JBOSS, Web Logic etc.</p>
   </div>
   <div class = "section">
      <h4 id = "spring">Spring</h4>
      <p>Spring framework is an open source Java platform that provides 
         comprehensive infrastructure support for developing robust Java 
         applications very easily and very rapidly.</p>
      <p>Spring framework was initially written by Rod Johnson and was first 
         released under the Apache 2.0 license in June 2003.</p>
   </div>
</div>
<script type = "text/javascript">
   $(function(){
      removeSection = function(e) {
         $(e).parents(".section").remove();
         $('[data-spy = "scroll"]').each(function () {
            var $spy = $(this).scrollspy('refresh')
         });
      }
      $("#myScrollspy").scrollspy();
   });
</script>
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事件 (Events)

下表列出了使用scrollspy的事件。 此事件可用于挂钩函数。

事件 描述 例
activate.bs.scrollspy 每当一个新项目被scrollspy激活时，此事件就会触发。 
$('#myScrollspy').on('activate.bs.scrollspy', function () {
   // do something…
})

例子 (Example)

以下示例演示了activate.bs.scrollspy事件的用法 - 

<html>
   <head>
      <link rel = "stylesheet" href = "bootstrap/css/bootstrap.min.css">
      <script src = "bootstrap/scripts/jquery.min.js"></script>
      <script src = "bootstrap/js/bootstrap.min.js"></script>
      <script>
         $(document).ready(function(){
            removeSection = function(e) {
               $(e).parents(".subject").remove();
               $('[data-spy="scroll"]').each(function () {
                  var $spy = $(this).scrollspy('refresh')
               });
            }
            $("#Navexample").scrollspy();
            // The event is fired when an item gets actived with the scrollspy
            $("#Navexample").on('activate.bs.scrollspy', function () {
               var currentSection = $(".nav li.active > a").text();
               $("#spyevent").html("Current Item being viewed >> " + currentSection);
            })
         });
      </script>
      <style>
         .scroll-box {
            height: 250px;
            position: relative;
            overflow: auto;
            font-size:2em;
         }
      </style>
   </head>
   <body>
      <div class = "container">
         <nav id = "Navexample" class = "navbar navbar-default" role = "navigation">
            <!-- Nav Bar -->
            <div class = "navbar-header">
               <button type = "button" class = "navbar-toggle" 
                  data-toggle = "collapse" data-target = "#navbarCollapse">
                  <span class = "sr-only">Toggle navigation</span>
                  <span class = "icon-bar"></span>
                  <span class = "icon-bar"></span>
                  <span class = "icon-bar"></span>
               </button>
               <a class = "navbar-brand" href = "#">IOWIKI</a>
            </div>
            <!-- Links and Sublinks -->
            <div class = "collapse navbar-collapse" id = "navbarCollapse">
               <ul class = "nav navbar-nav">
                  <li class = "active"><a href = "#subject-1">Subject 1</a></li>
                  <li><a href = "#subject-2">Subject 2</a></li>
                  <li class = "dropdown"><a href = "#" class = "dropdown-toggle" 
                     data-toggle = "dropdown">Subject 3<b class = "caret"></b></a>
                     <ul class = "dropdown-menu">
                        <li><a href = "#subject-3-1">Subject 3.1</a></li>
                        <li><a href = "#subject-3-2">Subject 3.2</a></li>
                        <li><a href = "#subject-3-3">Subject 3.3</a></li>
                     </ul>
                  </li>
                  <li><a href = "#subject-4">Subject 4</a></li>
               </ul>
            </div>
         </nav>
         <div class = "scroll-box" data-spy = "scroll" data-offset = "0">
            <div class = "subject">
               <h3 id = "subject-1">Subject 1 
                  <small><a href = "#" onclick = "removeSubject(this);">Remove Subject ×</a></small>
               </h3>
               <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit,
                  sed do eiusmod tempor incididunt ut labore et dolore magna
                  aliqua. Ut enim ad minim veniam, quis nostrud exercitation
                  ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
            </div>
            <hr>
            <div class = "subject">
               <h3 id = "subject-2">Subject 2 
                  <small><a href = "#" onclick = "removeSubject(this);">Remove Subject ×</a></small>
               </h3>
               <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit,
                  sed do eiusmod tempor incididunt ut labore et dolore magna
                  aliqua. Ut enim ad minim veniam, quis nostrud exercitation
                  ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
            </div>
            <hr>
            <div class = "subject">
               <h3 id = "subject-3">Subject 3 
                  <small><a href = "#" onclick = "removeSubject(this);"> Remove Subject ×</a></small>
               </h3>
               <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit,
                  sed do eiusmod tempor incididunt ut labore et dolore magna
                  aliqua. Ut enim ad minim veniam, quis nostrud exercitation
                  ullamco laboris nisi ut aliquip ex ea commodo consequat.</p><
            </div>
            <hr>
            <div class = "subject">
               <h4 id = "subject-3-1">Subject 3.1
                  <small><a href = "#" onclick = "removeSubject(this);"> Remove Subject ×</a></small>
               </h4>
               <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit,
                  sed do eiusmod tempor incididunt ut labore et dolore magna
                  aliqua. Ut enim ad minim veniam, quis nostrud exercitation
                  ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
            </div>
            <div class = "subject">
               <h4 id = "subject-3-2">Subject 3.2
                  <small><a href = "#" onclick = "removeSubject(this);"> Remove Subject ×</a></small>
               </h4>
               <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit,
                  sed do eiusmod tempor incididunt ut labore et dolore magna
                  aliqua. Ut enim ad minim veniam, quis nostrud exercitation
                  ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
            </div>
            <div class = "subject">
               <h4 id = "subject-3-3">Subject 3.3 
                  <small><a href = "#" onclick = "removeSubject(this);">Remove Subject ×</a></small>
               </h4>
               <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit,
                  sed do eiusmod tempor incididunt ut labore et dolore magna
                  aliqua. Ut enim ad minim veniam, quis nostrud exercitation
                  ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
            </div>
            <hr>
            <div class = "subject">
               <h3 id = "subject-4">Subject 4 
                  <small><a href = "#" onclick = "removeSubject(this);">Remove Subject ×</a></small>
               </h3>
               <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit,
                  sed do eiusmod tempor incididunt ut labore et dolore magna
                  aliqua. Ut enim ad minim veniam, quis nostrud exercitation
                  ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
            </div>
         </div>
         <hr>
         <h4 id = "spyevent" class = "text-info"></h4>
      </div>
   </body>
</html>
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