Bootstrap5 滚动监听
最后更新于:2022-03-27 03:00:42
Bootstrap5 滚动监听(Scrollspy)
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。
如何创建滚动监听
以下实例演示了如何创建滚动监听:
实例
<!– 可滚动区域 –>
<body data-bs-spy="scroll" data-bs-target=".navbar" data-bs-offset="50"> <!– 导航栏 – <a> 元素用于跳到指定滚动区域 –>
<nav class="navbar navbar-expand-sm bg-dark navbar-dark fixed-top">
…
<ul class="navbar-nav">
<li><a href="#section1">Section 1</a></li>
…
</nav> <!– Section 1 –>
<div id="section1">
<h1>Section 1</h1>
<p>Try to scroll this page and look at the navigation bar while scrolling!</p>
</div>
… </body>
<body data-bs-spy="scroll" data-bs-target=".navbar" data-bs-offset="50"> <!– 导航栏 – <a> 元素用于跳到指定滚动区域 –>
<nav class="navbar navbar-expand-sm bg-dark navbar-dark fixed-top">
…
<ul class="navbar-nav">
<li><a href="#section1">Section 1</a></li>
…
</nav> <!– Section 1 –>
<div id="section1">
<h1>Section 1</h1>
<p>Try to scroll this page and look at the navigation bar while scrolling!</p>
</div>
… </body>
实例解析
向您想要监听的元素(通常是 body)添加 data-bs-spy=”scroll” 。
然后添加 data-bs-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-bs-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:
实例
<div class="row">
<div class="col-4">
<nav id="navbar-example3" class="navbar navbar-light bg-light flex-column align-items-stretch p-3">
<a class="navbar-brand" href="#">Navbar</a>
<nav class="nav nav-pills flex-column">
<a class="nav-link" href="#item-1">Item 1</a>
<nav class="nav nav-pills flex-column">
<a class="nav-link ms-3 my-1" href="#item-1-1">Item 1-1</a>
<a class="nav-link ms-3 my-1" href="#item-1-2">Item 1-2</a>
</nav>
<a class="nav-link" href="#item-2">Item 2</a>
<a class="nav-link active" href="#item-3">Item 3</a>
<nav class="nav nav-pills flex-column">
<a class="nav-link ms-3 my-1" href="#item-3-1">Item 3-1</a>
<a class="nav-link ms-3 my-1 active" href="#item-3-2">Item 3-2</a>
</nav>
</nav>
</nav>
</div>
<div class="col-8">
<div data-bs-spy="scroll" data-bs-target="#navbar-example3" data-bs-offset="0" class="scrollspy-example-2" tabindex="0">
<h4 id="item-1">Item 1</h4>
<p>…</p>
<h5 id="item-1-1">Item 1-1</h5>
<p>…</p>
<h5 id="item-1-2">Item 1-2</h5>
<p>…</p>
<h4 id="item-2">Item 2</h4>
<p>…</p>
<h4 id="item-3">Item 3</h4>
<p>…</p>
<h5 id="item-3-1">Item 3-1</h5>
<p>…</p>
<h5 id="item-3-2">Item 3-2</h5>
<p>…</p>
</div>
</div>
</div>
<div class="col-4">
<nav id="navbar-example3" class="navbar navbar-light bg-light flex-column align-items-stretch p-3">
<a class="navbar-brand" href="#">Navbar</a>
<nav class="nav nav-pills flex-column">
<a class="nav-link" href="#item-1">Item 1</a>
<nav class="nav nav-pills flex-column">
<a class="nav-link ms-3 my-1" href="#item-1-1">Item 1-1</a>
<a class="nav-link ms-3 my-1" href="#item-1-2">Item 1-2</a>
</nav>
<a class="nav-link" href="#item-2">Item 2</a>
<a class="nav-link active" href="#item-3">Item 3</a>
<nav class="nav nav-pills flex-column">
<a class="nav-link ms-3 my-1" href="#item-3-1">Item 3-1</a>
<a class="nav-link ms-3 my-1 active" href="#item-3-2">Item 3-2</a>
</nav>
</nav>
</nav>
</div>
<div class="col-8">
<div data-bs-spy="scroll" data-bs-target="#navbar-example3" data-bs-offset="0" class="scrollspy-example-2" tabindex="0">
<h4 id="item-1">Item 1</h4>
<p>…</p>
<h5 id="item-1-1">Item 1-1</h5>
<p>…</p>
<h5 id="item-1-2">Item 1-2</h5>
<p>…</p>
<h4 id="item-2">Item 2</h4>
<p>…</p>
<h4 id="item-3">Item 3</h4>
<p>…</p>
<h5 id="item-3-1">Item 3-1</h5>
<p>…</p>
<h5 id="item-3-2">Item 3-2</h5>
<p>…</p>
</div>
</div>
</div>
列表组形式:
实例
<div id="list-example" class="list-group">
<a class="list-group-item list-group-item-action" href="#list-item-1">Item 1</a>
<a class="list-group-item list-group-item-action" href="#list-item-2">Item 2</a>
<a class="list-group-item list-group-item-action" href="#list-item-3">Item 3</a>
<a class="list-group-item list-group-item-action" href="#list-item-4">Item 4</a>
</div>
<div data-bs-spy="scroll" data-bs-target="#list-example" data-bs-offset="0" class="scrollspy-example" tabindex="0">
<h4 id="list-item-1">Item 1</h4>
<p>…</p>
<h4 id="list-item-2">Item 2</h4>
<p>…</p>
<h4 id="list-item-3">Item 3</h4>
<p>…</p>
<h4 id="list-item-4">Item 4</h4>
<p>…</p>
</div>
<a class="list-group-item list-group-item-action" href="#list-item-1">Item 1</a>
<a class="list-group-item list-group-item-action" href="#list-item-2">Item 2</a>
<a class="list-group-item list-group-item-action" href="#list-item-3">Item 3</a>
<a class="list-group-item list-group-item-action" href="#list-item-4">Item 4</a>
</div>
<div data-bs-spy="scroll" data-bs-target="#list-example" data-bs-offset="0" class="scrollspy-example" tabindex="0">
<h4 id="list-item-1">Item 1</h4>
<p>…</p>
<h4 id="list-item-2">Item 2</h4>
<p>…</p>
<h4 id="list-item-3">Item 3</h4>
<p>…</p>
<h4 id="list-item-4">Item 4</h4>
<p>…</p>
</div>