on scroll javascript code example

Example 1: javascript scrollintoview

var element = document.getElementById("box");

element.scrollIntoView();
element.scrollIntoView(false);
element.scrollIntoView({block: "end"});
element.scrollIntoView({behavior: "smooth", block: "end", inline: "nearest"});

Example 2: js onscroll event

// HTML:
<element onscroll="myScript">
// JavaScript:
object.addEventListener("scroll", myScript)
// or
object.onscroll = function() { /*...*/ }