Automatically update Bootstrap navigation or list group components based on scroll position to indicate which link is currently active in the viewport.
Scrollspy has a few requirements to function properly:
position: relative;
on the element you’re spying on, usually the <body>
.<body>
, be sure to have a height
set and overflow-y: scroll;
applied.<a>
) are required and must point to an element with that id
.When successfully implemented, your nav or list group will update accordingly, moving the .active
class from one item to the next based on their associated targets.
Scroll the area below the navbar and watch the active class change. The dropdown items will be highlighted as well.
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<nav id="navbar-example2" class="navbar navbar-light bg-light px-3">
<a class="navbar-brand" href="#">Navbar</a>
<ul class="nav nav-pills">
<li class="nav-item">
<a class="nav-link" href="#fat">@fat</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#mdo">@mdo</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" data-bs-toggle="dropdown" href="#" role="button" aria-expanded="false">Dropdown</a>
<ul class="dropdown-menu dropdown-menu-right">
<li><a class="dropdown-item" href="#one">one</a></li>
<li><a class="dropdown-item" href="#two">two</a></li>
<li><hr class="dropdown-divider"></li>
<li><a class="dropdown-item" href="#three">three</a></li>
</ul>
</li>
</ul>
</nav>
<div data-spy="scroll" data-bs-target="#navbar-example2" data-offset="0">
<h4 id="fat">@fat</h4>
<p>...</p>
<h4 id="mdo">@mdo</h4>
<p>...</p>
<h4 id="one">one</h4>
<p>...</p>
<h4 id="two">two</h4>
<p>...</p>
<h4 id="three">three</h4>
<p>...</p>
</div>
Scrollspy also works with .list-group
s. Scroll the area next to the list group and watch the active class change.
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<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-spy="scroll" data-bs-target="#list-example" data-offset="0" class="scrollspy-example">
<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>
To easily add scrollspy behavior to your topbar navigation, add data-spy="scroll"
to the element you want to spy on (most typically this would be the <body>
). Then add the data-target
attribute with the ID or class of the parent element of any Bootstrap .nav
component.
body {
position: relative;
}
<body data-spy="scroll" data-bs-target="#navbar-example">
...
<div id="navbar-example">
<ul class="nav nav-tabs" role="tablist">
...
</ul>
</div>
...
</body>
After adding position: relative;
in your CSS, call the scrollspy via JavaScript:
var scrollSpy = new bootstrap.ScrollSpy(document.body, {
target: '#navbar-example'
})
Resolvable ID targets required
Navbar links must have resolvable id targets. For example, a
<a href="#home">home</a>
must correspond to something in the DOM like<div id="home"></div>
.
Target elements that are not visible will be ignored and their corresponding nav items will never be highlighted.
When using scrollspy in conjunction with adding or removing of elements from the DOM, you’ll need to call the refresh method like so:
var dataSpyList = [].slice.call(document.querySelectorAll('[data-spy="scroll"]'))
dataSpyList.forEach(function (dataSpyEl) {
bootstrap.ScrollSpy.getInstance(dataSpyEl)
.refresh()
})
Destroys an element’s scrollspy.
Static method which allows you to get the scrollspy instance associated with a DOM element
var scrollSpyContentEl = document.getElementById('content')
var scrollSpy = bootstrap.ScrollSpy.getInstance(scrollSpyContentEl) // Returns a Bootstrap scrollspy instance
Options can be passed via data attributes or JavaScript. For data attributes, append the option name to data-
, as in data-offset=""
.
Name | Type | Default | Description |
---|---|---|---|
offset | number | 10 | Pixels to offset from top when calculating position of scroll. |
method | string | auto | Finds which section the spied element is in. auto will choose the best method to get scroll coordinates. offset will use the Element.getBoundingClientRect() method to get scroll coordinates. position will use the HTMLElement.offsetTop and HTMLElement.offsetLeft properties to get scroll coordinates. |
target | string | jQuery object | DOM element | Specifies element to apply Scrollspy plugin. |
Event type | Description |
---|---|
activate.bs.scrollspy | This event fires on the scroll element whenever a new item becomes activated by the scrollspy. |
var firstScrollSpyEl = document.querySelector('[data-spy="scroll"]')
firstScrollSpyEl.addEventListener('activate.bs.scrollspy', function () {
// do something...
})