--- layout: docs title: Scrollspy description: Automatically update Bootstrap navigation or list group components based on scroll position to indicate which link is currently active in the viewport. group: components toc: true --- ## How it works Scrollspy toggles the `.active` class on anchor (``) elements when the element with the `id` referenced by the anchor's `href` is scrolled into view. Generally, it will be most useful in conjunction with a Bootstrap [nav component]({{< docsref "/components/navs-tabs" >}}) or [list group]({{< docsref "/components/list-group" >}}), but it will also work with any anchor elements in the current page. {{< callout >}} ### Scrollable containers and keyboard access If you're making a scrollable container (other than the ``), be sure to have a `height` set and `overflow-y: scroll;` applied to it—alongside a `tabindex="0"` to ensure keyboard access. {{< /callout >}} ## Example in navbar Scroll the area below the navbar and watch the active class change. The dropdown items will be highlighted as well.

First heading

This is some placeholder content for the scrollspy page. Note that as you scroll down the page, the appropriate navigation link is highlighted. It's repeated throughout the component example. We keep adding some more example copy here to emphasize the scrolling and highlighting.

Second heading

This is some placeholder content for the scrollspy page. Note that as you scroll down the page, the appropriate navigation link is highlighted. It's repeated throughout the component example. We keep adding some more example copy here to emphasize the scrolling and highlighting.

Third heading

This is some placeholder content for the scrollspy page. Note that as you scroll down the page, the appropriate navigation link is highlighted. It's repeated throughout the component example. We keep adding some more example copy here to emphasize the scrolling and highlighting.

Fourth heading

This is some placeholder content for the scrollspy page. Note that as you scroll down the page, the appropriate navigation link is highlighted. It's repeated throughout the component example. We keep adding some more example copy here to emphasize the scrolling and highlighting.

Fifth heading

This is some placeholder content for the scrollspy page. Note that as you scroll down the page, the appropriate navigation link is highlighted. It's repeated throughout the component example. We keep adding some more example copy here to emphasize the scrolling and highlighting.

```html

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Second heading

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Third heading

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``` ## Example with nested nav Scrollspy also works with nested `.nav`s. If a nested `.nav` is `.active`, its parents will also be `.active`. Scroll the area next to the navbar and watch the active class change.

Item 1

This is some placeholder content for the scrollspy page. Note that as you scroll down the page, the appropriate navigation link is highlighted. It's repeated throughout the component example. We keep adding some more example copy here to emphasize the scrolling and highlighting.

Item 1-1

This is some placeholder content for the scrollspy page. Note that as you scroll down the page, the appropriate navigation link is highlighted. It's repeated throughout the component example. We keep adding some more example copy here to emphasize the scrolling and highlighting.

Item 1-2

This is some placeholder content for the scrollspy page. Note that as you scroll down the page, the appropriate navigation link is highlighted. It's repeated throughout the component example. We keep adding some more example copy here to emphasize the scrolling and highlighting.

Item 2

This is some placeholder content for the scrollspy page. Note that as you scroll down the page, the appropriate navigation link is highlighted. It's repeated throughout the component example. We keep adding some more example copy here to emphasize the scrolling and highlighting.

Item 3

This is some placeholder content for the scrollspy page. Note that as you scroll down the page, the appropriate navigation link is highlighted. It's repeated throughout the component example. We keep adding some more example copy here to emphasize the scrolling and highlighting.

Item 3-1

This is some placeholder content for the scrollspy page. Note that as you scroll down the page, the appropriate navigation link is highlighted. It's repeated throughout the component example. We keep adding some more example copy here to emphasize the scrolling and highlighting.

Item 3-2

This is some placeholder content for the scrollspy page. Note that as you scroll down the page, the appropriate navigation link is highlighted. It's repeated throughout the component example. We keep adding some more example copy here to emphasize the scrolling and highlighting.

```html

Item 1

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Item 1-1

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Item 2

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Item 3

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Item 3-1

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Item 3-2

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``` ## Example with list-group Scrollspy also works with `.list-group`s. Scroll the area next to the list group and watch the active class change.

Item 1

This is some placeholder content for the scrollspy page. Note that as you scroll down the page, the appropriate navigation link is highlighted. It's repeated throughout the component example. We keep adding some more example copy here to emphasize the scrolling and highlighting.

Item 2

This is some placeholder content for the scrollspy page. Note that as you scroll down the page, the appropriate navigation link is highlighted. It's repeated throughout the component example. We keep adding some more example copy here to emphasize the scrolling and highlighting.

Item 3

This is some placeholder content for the scrollspy page. Note that as you scroll down the page, the appropriate navigation link is highlighted. It's repeated throughout the component example. We keep adding some more example copy here to emphasize the scrolling and highlighting.

Item 4

This is some placeholder content for the scrollspy page. Note that as you scroll down the page, the appropriate navigation link is highlighted. It's repeated throughout the component example. We keep adding some more example copy here to emphasize the scrolling and highlighting.

```html
Item 1 Item 2 Item 3 Item 4

Item 1

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Item 2

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Item 3

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Item 4

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``` ## Example with simple anchors Scrollspy is not limited to nav components and list groups, but will work on any `` anchor elements in the current document. Scroll the area and watch the `.active` class change.
Item 1 Item 2 Item 3 Item 4 Item 5

Item 1

This is some placeholder content for the scrollspy page. Note that as you scroll down the page, the appropriate navigation link is highlighted. It's repeated throughout the component example. We keep adding some more example copy here to emphasize the scrolling and highlighting.

Item 2

This is some placeholder content for the scrollspy page. Note that as you scroll down the page, the appropriate navigation link is highlighted. It's repeated throughout the component example. We keep adding some more example copy here to emphasize the scrolling and highlighting.

Item 3

This is some placeholder content for the scrollspy page. Note that as you scroll down the page, the appropriate navigation link is highlighted. It's repeated throughout the component example. We keep adding some more example copy here to emphasize the scrolling and highlighting.

Item 4

This is some placeholder content for the scrollspy page. Note that as you scroll down the page, the appropriate navigation link is highlighted. It's repeated throughout the component example. We keep adding some more example copy here to emphasize the scrolling and highlighting.

Item 5

This is some placeholder content for the scrollspy page. Note that as you scroll down the page, the appropriate navigation link is highlighted. It's repeated throughout the component example. We keep adding some more example copy here to emphasize the scrolling and highlighting.

```html
Item 1 Item 2 Item 3 Item 4

Item 1

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Item 2

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Item 3

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Item 4

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``` ## Usage ### Via data attributes To easily add scrollspy behavior to your topbar navigation, add `data-bs-spy="scroll"` to the element you want to spy on (most typically this would be the ``). Then add the `data-bs-target` attribute with the `id` or class name of the parent element of any Bootstrap `.nav` component. ```html ... ... ``` ### Via JavaScript ```js const scrollSpy = new bootstrap.ScrollSpy(document.body, { target: '#navbar-example' }) ``` {{< callout danger >}} #### Requires resolvable `id` targets Links must have resolvable `id` targets, otherwise they are being ignored. For example, a `home` must correspond to something in the DOM like `
` {{< /callout >}} {{< callout info >}} #### Non-visible target elements are ignored Target elements that are not visible will be ignored and their corresponding nav items will never be highlighted. {{< /callout >}} ### Options {{< markdown >}} {{< partial "js-data-attributes.md" >}} {{< /markdown >}} {{< bs-table "table" >}} | Name | Type | Default | Description | | --- | --- | --- | --- | | `rootMargin` | string | `0px 0px -40%` | Intersection Observer [rootMargin](https://developer.mozilla.org/en-US/docs/Web/API/IntersectionObserver/rootMargin) valid units, when calculating scroll position. | | `smoothScroll` | boolean | `false` | Enables smooth scrolling when a user clicks on a link that refers to ScrollSpy observables. | | `target` | string \| jQuery object \| DOM element | | Specifies element to apply Scrollspy plugin. | {{< /bs-table >}} {{< callout warning >}} **Deprecated Options** Up until v5.1.3 we were using `offset` & `method` options, which are now deprecated and replaced by `rootMargin`. To keep backwards compatibility, we will continue to parse a given `offset` to `rootMargin`, but this feature will be removed in **v6**. {{< /callout >}} ### Methods {{< bs-table "table" >}} | Method | Description | | --- | --- | | `refresh` | When adding or removing elements in the DOM, you'll need to call the refresh method. | | `dispose` | Destroys an element's scrollspy. (Removes stored data on the DOM element) | | `getInstance` | *Static* method to get the scrollspy instance associated with a DOM element | | `getOrCreateInstance` | *Static* method to get the scrollspy instance associated with a DOM element, or to create a new one in case it wasn't initialized. | {{< /bs-table >}} Here's an example using the refresh method: ```js const dataSpyList = document.querySelectorAll('[data-bs-spy="scroll"]') dataSpyList.forEach(dataSpyEl => { bootstrap.ScrollSpy.getInstance(dataSpyEl).refresh() }) ``` ### Events {{< bs-table "table" >}} | Event | Description | | --- | --- | | `activate.bs.scrollspy` | This event fires on the scroll element whenever an anchor is activated by the scrollspy. | {{< /bs-table >}} ```js const firstScrollSpyEl = document.querySelector('[data-bs-spy="scroll"]') firstScrollSpyEl.addEventListener('activate.bs.scrollspy', () => { // do something... }) ```