引导绳\ 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。其中一个功能是引导滚动浏览，它在滚动区域时自动定位导航栏内容。 示例 1 : Scrollspy 垂直导航栏
超文本标记语言
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet"
href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
</script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/js/bootstrap.min.js">
</script>
<style>
body {
position: relative;
}
ul.nav-pills {
top: 20px;
position: fixed;
}
div.col-sm-9 div {
height: 250px;
font-size: 18px;
}
a {
color: green;
}
#section1 {color: white; background-color: green;}
#section2 {color: green; background-color: white;}
#section3 {color: white; background-color: green;}
#section4 {color: green; background-color: white;}
@media screen and (max-width: 810px) {
#section1, #section2, #section3, #section4 {
margin-left: 150px;
}
}
</style>
</head>
<body data-spy="scroll" data-target="#myScrollspy" data-offset="20">
<div class="container">
<div class="row">
<nav class="col-sm-3" id="myScrollspy">
<ul class="nav nav-pills nav-stacked">
<li class="active"><a href="#section1">Section 1</a></li>
<li><a href="#section2">Section 2</a></li>
<li><a href="#section3">Section 3</a></li>
<li><a href="#section4">Section 4</a></li>
</ul>
</nav>
<div class="col-sm-9">
<div id="section1">
<center>
<h1>Section 1</h1>
<h3>GeeksforGeeks</h3>
<h5>A computer science portal for geeks.</h5>
<h6> This portal has been created to provide well written, well thought
and well explained solutions for selected questions related to programming,
algorithms, other computer science subjects.</h6>
<p>Scroll this section and see the navigation list while scrolling.</p>
</center>
</div>
<div id="section2">
<center>
<h1>Section 2</h1>
<h3>GeeksforGeeks</h3>
<h5>A computer science portal for geeks.</h5>
<h6> This portal also provide GATE previous year papers,
short notes for the aspirants.</h6>
<p>Scroll this section and see the navigation list while scrolling.</p>
</center>
</div>
<div id="section3">
<center>
<h1>Section 3</h1>
<h3>GeeksforGeeks</h3>
<h5>A computer science portal for geeks.</h5>
<h6>This portal also provide interview questions asked
by private and public sectors.</h6>
<p>Scroll this section and see the navigation list while scrolling.</p>
</center>
</div>
<div id="section4">
<center>
<h1>Section 4</h1>
<h3>GeeksforGeeks</h3>
<h5>A computer science portal for geeks.</h5>
<h6>It also provide Internship aor contributor program for students.</h6>
<p>Scroll this section and see the navigation list while scrolling.</p>
</center>
</div>
</div>
</div>
</div>
</body>
</html>
输出:
示例 2 : Scrollspy 水平导航栏
超文本标记语言
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet"
href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
</script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/js/bootstrap.min.js">
</script>
<style>
body {
position: relative;
}
p {
font-size: 18px;
}
#section1 {padding-top:50px;height:500px;color: white; background-color: green;}
#section2 {padding-top:50px;height:500px;color: green; background-color: white;}
#section3 {padding-top:50px;height:500px;color: white; background-color: green;}
#section4 {padding-top:50px;height:500px;color: green; background-color: white;}
</style>
</head>
<body data-spy="scroll" data-target=".navbar" data-offset="50">
<nav class="navbar navbar-inverse navbar-fixed-top">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle"
data-toggle="collapse" data-target="#myNavbar">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">GeeksforGeeks</a>
</div>
<div>
<div class="collapse navbar-collapse" id="myNavbar">
<ul class="nav navbar-nav">
<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><a href="#section4">Section 4</a></li>
</ul>
</div>
</div>
</div>
</nav>
<div id="section1" class="container-fluid">
<h1>Section 1</h1>
<h3>GeeksforGeeks</h3>
<h5>A computer science portal for geeks.</h5>
<h6> This portal has been created to provide well written, well thought
and well explained solutions for selected questions related to programming,
algorithms, other computer science subjects.</h6>
<p>Scroll this section.</p>
</div>
<div id="section2" class="container-fluid">
<h1>Section 2</h1>
<h3>GeeksforGeeks</h3>
<h5>A computer science portal for geeks.</h5>
<h6> This portal also provide GATE previous year papers,
short notes for the aspirants.</h6>
<p>Scroll this section.</p>
</div>
<div id="section3" class="container-fluid">
<h1>Section 3</h1>
<h3>GeeksforGeeks</h3>
<h5>A computer science portal for geeks.</h5>
<h6>This portal also provide interview questions
asked by private and public sectors.</h6>
<p>Scroll this section.</p>
</div>
<div id="section4" class="container-fluid">
<h1>Section 4</h1>
<h3>GeeksforGeeks</h3>
<h5>A computer science portal for geeks.</h5>
<h6>It also provide Internship or contributor program for students.</h6>
<p>Scroll this section.</p>
</div>
</body>
</html>
输出:
支持的浏览器:
- 谷歌 Chrome
- 微软边缘
- 火狐浏览器
- 歌剧
- 旅行队
一些属性添加了实现该功能的元素。 这些是–
- data-spy 它是一个要添加元素的属性，该元素用作可滚动区域(在上面的示例中，我们将其作为主体)。 数据间谍的价值是卷轴。
- 数据-目标该属性用于连接导航栏和可滚动区。 取值为导航栏 ID 或类的名称。
- 数据-偏移该属性指定计算滚动位置时从顶部偏移的像素数。
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