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| 当前阅读教程：Bootstrap4教程 > Bootstrap 滚动监听(Scrollspy) | |
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滚动监听（Scrollspy）插件，即自动更新导航插件，会根据滚动条的位置自动更新对应的导航目标。其基本的实现是随着您的滚动。
以下实例演示了如何创建滚动监听： 实例 <!-- 可滚动区域 --> <body data-spy="scroll" data-target=".navbar" data-offset="50"> <!-- The navbar - The <a> elements are used to jump to a section in the scrollable area --> <nav class="navbar navbar-expand-sm bg-dark navbar-dark fixed-top"> ... <ul> <li><a href="#section1">Section 1</a></li> ... </nav> <!-- 第一部分内容 --> <div id="section1"> <h1>Section 1</h1> <p>Try to scroll this page and look at the navigation bar while scrolling!</p> </div> ... </body> 完整代码 <!DOCTYPE html>
<html>
<head>
<title>Bootstrap 实例(小白教程网 2d5.net)</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css">
<script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script>
<script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script>
<script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
<style>
body {
position: relative;
}
</style>
</head>
<body data-spy="scroll" data-target=".navbar" data-offset="50">
<nav class="navbar navbar-expand-sm bg-dark navbar-dark fixed-top">
<ul>
<li>
<a href="#section1">Section 1</a>
</li>
<li>
<a href="#section2">Section 2</a>
</li>
<li>
<a href="#section3">Section 3</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbardrop" data-toggle="dropdown">
Section 4
</a>
<div>
<a href="#section41">Link 1</a>
<a href="#section42">Link 2</a>
</div>
</li>
</ul>
</nav>
<div id="section1" class="container-fluid bg-success" style="padding-top:70px;padding-bottom:70px">
<h1>Section 1</h1>
<p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
<p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
</div>
<div id="section2" class="container-fluid bg-warning" style="padding-top:70px;padding-bottom:70px">
<h1>Section 2</h1>
<p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
<p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
</div>
<div id="section3" class="container-fluid bg-secondary" style="padding-top:70px;padding-bottom:70px">
<h1>Section 3</h1>
<p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
<p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
</div>
<div id="section41" class="container-fluid bg-danger" style="padding-top:70px;padding-bottom:70px">
<h1>Section 4 Submenu 1</h1>
<p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
<p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
</div>
<div id="section42" class="container-fluid bg-info" style="padding-top:70px;padding-bottom:70px">
<h1>Section 4 Submenu 2</h1>
<p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
<p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
</div>
</body>
</html>实例解析 向您想要监听的元素（通常是 body）添加 data-spy="scroll" 。 然后添加 data-target 属性，它的值为导航栏的 id 或 class (.navbar)。这样就可以联系上可滚动区域。
注意可滚动项元素上的 id （<div id="section1">） 必须匹配导航栏上的链接选项 （<a href="#section1">)。 可选项data-offset 属性用于计算滚动位置时，距离顶部的偏移像素。 默认为 10 px。 设置相对定位: 使用 data-spy="scroll" 的元素需要将其 CSS position 属性设置为 "relative" 才能起作用。 以下实例设置了垂直滚动监听： 实例 <body data-spy="scroll" data-target="#myScrollspy" data-offset="1"> <div> <div> <nav class="col-sm-3 col-4" id="myScrollspy"> <ul class="nav nav-pills flex-column"> <li> <a class="nav-link active" href="#section1">Section 1</a> </li> ... </ul> </nav> <div class="col-sm-9 col-8"> <div id="section1"> <h1>Section 1</h1> <p>Try to scroll this page and look at the navigation list while scrolling!</p> </div> ... </div> </div> </div> </body> 完整代码 <!DOCTYPE html>
<html>
<head>
<title>Bootstrap 实例(小白教程网 2d5.net)</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css">
<script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script>
<script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script>
<script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
<style>
body {
position: relative;
}
ul.nav-pills {
top: 20px;
position: fixed;
}
div.col-8 div {
height: 500px;
}
</style>
</head>
<body data-spy="scroll" data-target="#myScrollspy" data-offset="1">
<div>
<div>
<nav class="col-sm-3 col-4" id="myScrollspy">
<ul class="nav nav-pills flex-column">
<li>
<a class="nav-link active" href="#section1">Section 1</a>
</li>
<li>
<a href="#section2">Section 2</a>
</li>
<li>
<a href="#section3">Section 3</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#">Section 4</a>
<div>
<a href="#section41">Link 1</a>
<a href="#section42">Link 2</a>
</div>
</li>
</ul>
</nav>
<div class="col-sm-9 col-8">
<div id="section1">
<h1>Section 1</h1>
<p>Try to scroll this section and look at the navigation list while scrolling!</p>
</div>
<div id="section2">
<h1>Section 2</h1>
<p>Try to scroll this section and look at the navigation list while scrolling!</p>
</div>
<div id="section3">
<h1>Section 3</h1>
<p>Try to scroll this section and look at the navigation list while scrolling!</p>
</div>
<div id="section41">
<h1>Section 4-1</h1>
<p>Try to scroll this section and look at the navigation list while scrolling!</p>
</div>
<div id="section42">
<h1>Section 4-2</h1>
<p>Try to scroll this section and look at the navigation list while scrolling!</p>
</div>
</div>
</div>
</div>
</body>
</html>效果图
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