30-seconds-of-code/snippets/scrollToTop.md

title, tags

title	tags
scrollToTop	browser,intermediate

Smooth-scrolls to the top of the page.

• Get distance from top using document.documentElement.scrollTop or document.body.scrollTop.
• Scroll by a fraction of the distance from the top.
• Use window.requestAnimationFrame() to animate the scrolling.

const scrollToTop = () => {
  const c = document.documentElement.scrollTop || document.body.scrollTop;
  if (c > 0) {
    window.requestAnimationFrame(scrollToTop);
    window.scrollTo(0, c - c / 8);
  }
};

scrollToTop();