Bootstrap 滚动监听(Scrollspy)

深藏阁楼爱情的钟 2021-09-15 01:58 299阅读 0赞

body \{  
  position: relative;       
  \}  
  </style>  
</head>  
<body data-spy="scroll" data-target=".navbar" data-offset="50">  
  
  
<nav class="navbar navbar-expand-sm  navbar-dark fixed-top">    
  <ul class="nav justify-content-center">  
    <li class="nav-item">  
      <a class="nav-link" href="\#section1">京东</a>  
    </li>  
    <li class="nav-item">  
      <a class="nav-link" href="\#section2">网易</a>  
    </li>  
    <li class="nav-item">  
      <a class="nav-link" href="\#section3">百度</a>  
    </li>  
    <li class="nav-item dropdown">  
      <a class="nav-link dropdown-toggle" href="\#" id="navbardrop" data-toggle="dropdown">  
        腾讯  
      </a>  
      <div class="dropdown-menu">  
        <a class="dropdown-item" href="\#section41">腾讯网</a>  
        <a class="dropdown-item" href="\#section42">QQ音乐</a>  
      </div>  
    </li>  
  </ul>  
</nav>  
![70][]  
  
<div id="section1" class="container-fluid " 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 " 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>

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：

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 class="container-fluid">  
  <div class="row">  
    <nav class="col-sm-3 col-4" id="myScrollspy">  
      <ul class="nav nav-pills flex-column">  
        <li class="nav-item">  
          <a class="nav-link active" href="\#section1">Section 1</a>  
        </li>  
        <li class="nav-item">  
          <a class="nav-link" href="\#section2">Section 2</a>  
        </li>  
        <li class="nav-item">  
          <a class="nav-link" 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 class="dropdown-menu">  
            <a class="dropdown-item" href="\#section41">Link 1</a>  
            <a class="dropdown-item" href="\#section42">Link 2</a>  
          </div>  
        </li>  
      </ul>  
    </nav>  
    <div class="col-sm-9 col-8">  
      <div id="section1" class="bg-success">      
        <h1>Section 1</h1>  
        <p>Try to scroll this section and look at the navigation list while scrolling!</p>  
      </div>  
      <div id="section2" class="bg-warning">   
        <h1>Section 2</h1>  
        <p>Try to scroll this section and look at the navigation list while scrolling!</p>  
      </div>          
      <div id="section3" class="bg-secondary">           
        <h1>Section 3</h1>  
        <p>Try to scroll this section and look at the navigation list while scrolling!</p>  
      </div>  
      <div id="section41" class="bg-danger">           
        <h1>Section 4-1</h1>  
        <p>Try to scroll this section and look at the navigation list while scrolling!</p>  
      </div>        
      <div id="section42" class="bg-info">           
        <h1>Section 4-2</h1>  
        <p>Try to scroll this section and look at the navigation list while scrolling!</p>  
      </div>  
    </div>  
  </div>

</div>

![70 1][]

[70]: /images/20210813/39af80d735924e04bdbf6b9d7fde8c99.png
[70 1]: /images/20210813/46061dea01aa4406b1bbce90543a818d.png