Scrollspy

Trigger events and animations while scrolling your page.

Usage
Groups
Set cls option per target
Component options
JavaScript
- Initialization
- Events
Scrollspy nav

Usage

The Scrollspy component listens to page scrolling and triggers events based on the scroll position. For example, if you scroll down a page, and an element appears in the viewport for the first time, you can trigger a smooth animation to fade in the element. Just add the data-uk-scrollspy attribute which takes the following options.

Typically, classes from the Animation component are used together with the Scrollspy component.

This example uses the repeat: true option. Scroll up and down to see the triggered animations. The layout is made with the Card component.

Groups

You can also group scrollspy elements, so you won’t have to apply the attribute to each of them. Just add the data-uk-scrollspy="target: SELECTOR" attribute to a container element, targeting the selector of the items you want to animate inside the container. When using a delay, it will be applied cumulatively to the items that scroll into view.

Set `cls` option per target

You can also give each target a separate cls option. Just add the data-uk-scrollspy-class="CLASS" attribute to a target element. It will override the cls option set on the component.

Component options

Any of these options can be applied to the component attribute. Separate multiple options with a semicolon. Learn more

Option	Value	Default	Description
`cls`	String		Class to toggle when the element enters/leaves viewport.
`target`	Boolean, CSS selector	`false`	Target to apply the scrollspy to. Defaults to the element itself.
`hidden`	Boolean	`true`	Hides the element while out of view.
`margin`	String	`-1px`	The margin is added to the viewport’s bounding box, before computing an intersection with the element. The value must be in px or % units.
`repeat`	Boolean	`false`	Applies the `cls` class every time the element is in view.
`delay`	Number	`0`	Delay time in ms.

cls is the Primary option and its key may be omitted, if it’s the only option in the attribute value.

JavaScript

Learn more about JavaScript components.

Initialization

Events

The following events will be triggered on elements with this component attached:

Name	Description
`inview`	Fires after an item moves into the viewport.
`outview`	Fires after an item moves into out of viewport.

Scrollspy nav

To automatically update the active menu item depending on the scroll position of your site, add the data-uk-scrollspy-nav attribute to any navigation. Each menu item must link to the ID of its corresponding part of the site.

For an example of the scrollspy nav, just check out the fixed nav on the right side of this page or take a look at the test. Any of the following options can be applied to the data-uk-scrollspy-nav attribute. Separate multiple options with a semicolon.

Scrollspy nav options

Any of these options can be applied to the component attribute. Separate multiple options with a semicolon. Learn more

Option	Value	Default	Description
`cls`	String	`uk-active`	Class to add to the active links.
`closest`	Boolean, CSS selector	`false`	Target to apply the class to. Defaults to the element itself.
`scroll`	Boolean	`false`	Adds the Scroll component to its links.
`target`	CSS selector	`a[href]`	Targets the anchor elements that should be used.
`offset`	Number	`0`	Offset added to scroll top.

Scrollspy nav JavaScript

Learn more about JavaScript components.

Scrollspy nav initialization

Scrollspy nav events