scrollTop not working on window scroll in javascript

Question

I am trying to attached onscroll function to window. But when I use scrollTop to get the scroll position it is giving me undefined. Does scrollTop can be use with document element only ?

window.onscroll=function(){
  console.log(this.scrollTop)
}

Working code

window.onscroll=function(){
  console.log(this.scrollY)
}

Answer 1

Yes, scrollTop can only be used on scroll-able elements, like document.documentElement.scrollTop or document.body.scrollTop or a textarea , a div , ...

All-browsers-compatible code

window.onscroll=function(){
  console.log((document.documentElement || document.body.parentNode || document.body).scrollTop)
}

Found on document.body.scrollTop vs document.documentElement.scrollTop