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Bootstrap4 滚动监听

CSSBootstrap

前言 🔗

  • 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。

1、创建滚动监听

  • 以下实例演示了如何创建滚动监听：

  • 实例

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    <body 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 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>

    <style>
        body {
            position: relative;
        }
    </style>

  • 效果 🔗

  • 解析

    • 向想要监听的元素（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 10px。
    • 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。

2、设置垂直滚动监听

  • 以下实例设置了垂直滚动监听：

  • 实例

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    <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>
    </body>

    <style>
        body {
            position: relative;
        }
        ul.nav-pills {
            top: 20px;
            position: fixed;
        }
        div.col-8 div {
            height: 500px;
        }
    </style>

  • 效果 🔗

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Qian Chia

Posted @ 2019-11-11 20:23


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文章目录
  1. 1. 前言 🔗
  2. 2. 1、创建滚动监听
  3. 3. 2、设置垂直滚动监听
隐藏目录