check if element is in viewport - vanilla JS. Use by adding a “scroll” event listener to the window and then calling isInViewport().

in_viewport.js

// Determine if an element is in the visible viewport
function isInViewport(element) {
  var rect = element.getBoundingClientRect();
  var html = document.documentElement;
  return (
    rect.top >= 0 &&
    rect.left >= 0 &&
    rect.bottom <= (window.innerHeight || html.clientHeight) &&
    rect.right <= (window.innerWidth || html.clientWidth)
  );
}
The above function could be used by adding a “scroll” event listener to the window and then calling isInViewport().

thanks so much!

Thanks for this!

Just wrote a similar version that only accounts for height, but returns true when any part of the element is in the viewport:

function isVisible (ele) {
  const { top, bottom } = ele.getBoundingClientRect();
  const vHeight = (window.innerHeight || document.documentElement.clientHeight);

  return (
    (top > 0 || bottom > 0) &&
    top < vHeight
  );
}

thank you Jjmu15 and Tsimons. Your snippets each address different needs.

Just wrote a similar version that only accounts for height, but returns true when any part of the element is in the viewport:

function isVisible (ele) {
  const { top, bottom } = ele.getBoundingClientRect();
  const vHeight = (window.innerHeight || document.documentElement.clientHeight);

  return (
    (top > 0 || bottom > 0) &&
    top < vHeight
  );
}

this is the one working as of now

Great work guys @jjmu15 and Tsimons@ Your snippets are amazing. I have been looking for something like this. Didn't want to import a library to solve just one problem

you are probably the greatest human being in my perspective now, thanks