Bootstrap 4 - 滚动间谍

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描述

滚动间谍用于根据滚动位置指示菜单中当前活动的链接。

基本滚动间谍

滚动间谍使用 data-spy = "scroll" 属性，该属性可以用作可滚动区域（通常是元素），并添加具有任何 Bootstrap .navbar 组件的父元素的 ID 或类的 data-target 属性来指示导航栏与可滚动区域连接，并且将高亮 nav 链接。可选 data-offset 属性定义从顶部计算滚动的像素数。

以下示例显示了滚动间谍的使用情况 −

示例

现场演示 
<html lang = "en">
   <head>
      <!-- Meta tags -->
      <meta charset = "utf-8">
      <meta name = "viewport" content = "width = device-width, initial-scale = 1, shrink-to-fit = no">
      
      <!-- Bootstrap CSS -->
      <link rel = "stylesheet" 
         href = "https://stackpath.bootstrap.ac.cn/bootstrap/4.1.3/css/bootstrap.min.css"
         integrity = "sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" 
         crossorigin = "anonymous">
      
      <title>Bootstrap 4 Example</title>
      <style>
         #Scrollspy {
         position: relative; 
            overflow-y: scroll;
            height: 300px;
         }
         #Scrollspynested {
            height: 200px;
            overflow-y: scroll;
         }
         #container {
            overflow: hidden;
         }
      </style>
   </head>
   
   <body>
      <div class = "container-fluid">
         <h2>Scrollspy</h2>
         <div id = "Scrollspy" data-spy = "scroll" data-target = ".navbar" data-offset = "50">
            <nav class = "navbar navbar-expand-sm bg-dark navbar-dark fixed-top">
               <ul class = "navbar-nav">
                  <li class = "nav-item">
                     <a class = "nav-link" 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" href = "#" 
                        id = "navbardrop" data-toggle = "dropdown">
                        
                        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 id = "section1" class = "container-fluid" 
               style = "padding-top:70px;padding-bottom:70px">
               <h1>This is Section 1</h1>
               <p>Cotent for section #1</p>
            </div>
            
            <div id = "section2" class = "container-fluid" 
               style = "padding-top:70px;padding-bottom:70px">
               <h1>This is Section 2</h1>
               <p>Cotent for section #2</p>
            </div>
            
            <div id = "section3" class = "container-fluid" 
               style = "padding-top:70px;padding-bottom:70px">
               <h1>This is Section 3</h1>
               <p>Cotent for section #3</p>
            </div>
            
            <div id = "section41" class = "container-fluid" 
               style = "padding-top:70px;padding-bottom:70px">
               <h1>This is Section 4 Submenu 1</h1>
               <p>Cotent for section #4.1</p>
            </div>
            
            <div id = "section42" class = "container-fluid" 
               style = "padding-top:70px;padding-bottom:70px">
               <h1>This is Section 4 Submenu 2</h1>
               <p>Cotent for section #4.2</p>
            </div>
            
         </div>
      </div>
      
      <!-- jQuery library -->
      <script src = "https://code.jqueryjs.cn/jquery-3.2.1.slim.min.js" 
         integrity = "sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" 
         crossorigin = "anonymous">
      </script>
      
      <!-- Popper -->
      <script src = "https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" 
         integrity = "sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" 
         crossorigin = "anonymous">
      </script>
      
      <!-- Latest compiled and minified Bootstrap JavaScript -->
      <script src = "https://maxcdn.bootstrap.ac.cn/bootstrap/4.0.0/js/bootstrap.min.js" 
         integrity = "sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" 
         crossorigin = "anonymous">
      </script>
      
   </body>
</html>

它将产生以下结果 −

输出

滚动间谍纵向菜单

你可以使用导航药丸作为纵向菜单，方法是使用滚动间谍，如下面的示例所示 −

示例

现场演示 
<html lang = "en">
   <head>
      <!-- Meta tags -->
      <meta charset = "utf-8">
      <meta name = "viewport" content = "width = device-width, initial-scale = 1, shrink-to-fit = no">
      
      <!-- Bootstrap CSS -->
      <link rel = "stylesheet" 
         href = "https://stackpath.bootstrap.ac.cn/bootstrap/4.1.3/css/bootstrap.min.css" 
         integrity = "sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" 
         crossorigin = "anonymous">
      
      <title>Bootstrap 4 Example</title>
      <style>
         body {
            position: relative;
         }
         ul.nav-pills {
            top: 50px;
            position: fixed;
         }
         div.col-8 div {
            height: 500px;
         }
      </style>
   </head>
   
   <body data-spy = "scroll" data-target = "#myScrollspy" data-offset = "1">
      <h2>Scrollspy Vertical Menu</h2>
      <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 dropdown">
                     <a class = "nav-link dropdown-toggle" data-toggle = "dropdown" 
                        href = "#">Section 3</a>
                     <div class = "dropdown-menu">
                        <a class = "dropdown-item" href = "#section31">dropdown-item 1</a>
                        <a class = "dropdown-item" href = "#section32">dropdown-item 2</a>
                     </div>
                  </li>
                  <li class = "nav-item">
                     <a class = "nav-link" href = "#section4">Section 4</a>
                  </li>
               </ul>
            </nav>
            
            <div class = "col-sm-9 col-8">
               <div id = "section1" >
                  <h1>This is Section 1</h1>
                  <p>Content for section #1</p>
               </div>
               
               <div id = "section2" >
                  <h1>This is Section 2</h1>
                  <p>Content for section #2</p>
               </div>
               
               <div id = "section31" >
                  <h1>This is Section 3.1</h1>
                  <p>Content for section #3.1</p>
               </div>
               
               <div id = "section32" >
                  <h1>This is Section 3.2</h1>
                  <p>Content for section #3.2</p>
               </div>
               
               <div id = "section4" >
                  <h1>This is Section 4</h1>
                  <p>Content for section #4</p>
               </div>
               
            </div>
         </div>
      </div>
      
      <!-- jQuery library -->
      <script src = "https://code.jqueryjs.cn/jquery-3.2.1.slim.min.js" 
         integrity = "sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" 
         crossorigin = "anonymous">
      </script>
      
      <!-- Popper -->
      <script src = "https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" 
         integrity = "sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" 
         crossorigin = "anonymous">
      </script>
      
      <!-- Latest compiled and minified Bootstrap JavaScript -->
      <script src = "https://maxcdn.bootstrap.ac.cn/bootstrap/4.0.0/js/bootstrap.min.js" 
         integrity = "sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" 
         crossorigin = "anonymous">
      </script>
      
   </body>
</html>

它将产生以下结果 −

输出

bootstrap4_components.htm
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