引导杆 4 \ scroll spy
有时在设计网站时，我们会加入一些吸引人的功能，让网站引人注目。其中一个特性是 Bootstrap scrollspy，它可以在滚动区域时自动定位导航栏内容。 创建滚动间谍:数据间谍=“滚动”和数据目标=“。navbar "属性用于创建 scrollspy 元素。scrollspy 用于在滚动页面时更新导航链接。
示例:
超文本标记语言
<!DOCTYPE html>
<html lang="en">
<head>
<title>Scrollspy</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
<script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
</script>
<script src=
"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js">
</script>
<script src=
"https://maxcdn.bootstrapcdn.com/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-success navbar-dark fixed-top">
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link" href="#content1">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#content2">Algo</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#content3">DS</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#"
id="navbardrop" data-toggle="dropdown">
Languages
</a>
<div class="dropdown-menu">
<a class="dropdown-item" href="#content4">C</a>
<a class="dropdown-item" href="#content5">C++</a>
</div>
</li>
</ul>
</nav>
<div id="content1" class="container-fluid bg-primary"
style="height:250px; padding-top:80px;">
<h1>GeeksforGeeks</h1>
<p>A computer science portal for geeks</p>
</div>
<div id="content2" class="container-fluid bg-light"
style="height:250px; padding-top:80px;">
<h1>Algorithm Analysis</h1>
<p>A stepwise procedure to solve a problem</p>
</div>
<div id="content3" class="container-fluid bg-warning"
style="height:250px; padding-top:80px;">
<h1>Data Structure</h1>
<p>
Data structure is a particular way to organizing the data
in computer memory so that it can be used efficiently.
</p>
</div>
<div id="content4" class="container-fluid bg-info"
style="height:250px; padding-top:80px;">
<h1>C Languages</h1>
<p>
C is a computer science programming language
</p>
</div>
<div id="content5" class="container-fluid bg-dark"
style="height:250px; padding-top:80px;">
<h1>C++ Languages</h1>
<p>
C++ is the extension of C language.
</p>
</div>
</body>
</html>
输出:
Scrollspy 垂直菜单:创建垂直导航菜单，内容根据菜单显示。
超文本标记语言
<!DOCTYPE html>
<html lang="en">
<head>
<title>Scrollspy</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
<script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
</script>
<script src=
"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js">
</script>
<script src=
"https://maxcdn.bootstrapcdn.com/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="#GFG_scrollspy" data-offset="1">
<div class="container-fluid">
<div class="row">
<nav class="col-sm-4 col-4" id="GFG_scrollspy">
<ul class="nav nav-pills flex-column">
<li class="nav-item">
<a class="nav-link active" href="#content1">
Home
</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#content2">
Algo
</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#content3">
DS
</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#"
id="navbardrop" data-toggle="dropdown">
Languages
</a>
<div class="dropdown-menu">
<a class="dropdown-item"
href="#content4">C</a>
<a class="dropdown-item"
href="#content5">C++</a>
</div>
</li>
</ul>
</nav>
<div class="col-sm-8 col-8">
<div id="content1" class="container-fluid bg-primary"
style="height:250px; padding-top:80px;">
<h1>GeeksforGeeks</h1>
<p>A computer science portal for geeks</p>
</div>
<div id="content2" class="container-fluid bg-light"
style="height:250px; padding-top:80px;">
<h1>Algorithm Analysis</h1>
<p>A stepwise procedure to solve a problem</p>
</div>
<div id="content3" class="container-fluid bg-warning"
style="height:250px; padding-top:80px;">
<h1>Data Structure</h1>
<p>
Data structure is a particular way to organizing
the data in computer memory so that it can be
used efficiently.
</p>
</div>
<div id="content4" class="container-fluid bg-info"
style="height:250px; padding-top:80px;">
<h1>C Languages</h1>
<p>
C is a computer science programming language
</p>
</div>
<div id="content5" class="container-fluid bg-dark"
style="height:250px; padding-top:80px;">
<h1>C++ Languages</h1>
<p>
C++ is the extension of C language.
</p>
</div>
</div>
</div>
</div>
</body>
</html>
输出:
支持的浏览器:
- 谷歌 Chrome
- 微软公司出品的 web 浏览器
- 火狐浏览器
- 歌剧
- 旅行队
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