web api event

Window: scrollsnapchange event

Limited availability

The scrollsnapchange event of the Window interface is fired on the window at the end of a scrolling operation when a new scroll snap target is selected.

This event works in much the same way as the Element interface’s scrollsnapchange event, except that the overall HTML document has to be set as the scroll snap container (i.e., scroll-snap-type is set on the <html> element).

Syntax

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("scrollsnapchange", (event) => { })

onscrollsnapchange = (event) => { }

Event type

A SnapEvent, which inherits from the generic Event type.

Examples

Basic usage

Let’s say we have a <main> element containing significant content that causes it to scroll:

<main>
  <!-- Significant content -->
</main>

The <main> element can be turned into a scroll container using a combination of CSS properties, for example:

main {
  width: 250px;
  height: 450px;
  overflow: scroll;
}

We can then implement scroll snapping behavior on the scrolling content by specifying the scroll-snap-type property on the <html> element:

html {
  scroll-snap-type: block mandatory;
}

The following JavaScript snippet would cause the scrollsnapchange event to fire on the HTML document when a child of the <main> element becomes a newly-selected snap target. In the handler function, we set a selected class on the child referenced by the snapTargetBlock, which could be used to style it to look like it has been selected (for example, with an animation) when the event fires.

window.addEventListener("scrollsnapchange", (event) => {
  event.snapTargetBlock.classList.add("selected");
});

Specifications

SpecificationsStandards references are available on the canonical MDN page.

Browser compatibility

Browser compatibilityCompatibility data is available on the canonical MDN page.