How to Use the JavaScript Window onscroll Event?

The onscroll event in JavaScript is fired when an element’s scrollbar is being scrolled. This event can be used to perform various actions, such as updating the content of a page or changing the style of an element, when a user scrolls the page.

Here’s an example of how to use the onscroll event:

window.onscroll = function() {
  // Your code here
};

In this example, the onscroll event is attached to the window object. When the user scrolls the page, the function inside the onscroll event will be executed.

Here’s an example of how to use the onscroll event to display the current scroll position of the page:

window.onscroll = function() {
  var scrollPosition = window.pageYOffset;
  console.log("Current scroll position: " + scrollPosition + "px");
};

In this example, the pageYOffset property of the window object is used to get the current scroll position of the page. The value is then logged to the console so you can see it in the browser’s developer tools.

Note that the onscroll event is only supported in modern browsers, and some older browsers may not support it. You can check for browser compatibility and use alternative methods, such as the addEventListener method, to ensure that your code works in all browsers.