Window scrollY

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Example 1

Scroll the content by 100 pixels, and alert the scrollX and scrollY:

window.scrollBy(100, 100);
alert(window.scrollX + window.scrollY);

Try it Yourself »

More examples below.

Description

The scrollY property returns the pixels a document has scrolled from the upper left corner of the window.

The scrollY property is read-only.

Note

The scrollY property is equal to the pageYOffset property.

For cross-browser compatibility, use window.pageYOffset instead of window.scrollY.

Syntax

window.scrollY

or just:

scrollY

Return Value

Type	Description
A number	The number of pixels the document has scrolled from the upper left corner of the window.

More Examples

Create a sticky navigation bar:

// Get the navbar
const navbar = document.getElementById("navbar");

// Get the offset position of the navbar
const sticky = navbar.offsetTop;

// Add the sticky class to the navbar when you reach its scroll position. Remove the sticky class when you leave the scroll position.
function myFunction() {
if (window.scrollY >= sticky) {
navbar.classList.add("sticky")
} else {
navbar.classList.remove("sticky");
}
}