The onscroll event occurs when scrollbar is being scrolled for an element. You can try to run the following code to learn how to implement onscroll event in JavaScript.
Example
<!DOCTYPE html>
<html>
<head>
<style>
div {
border: 2px solid blue;
width: 300px;
height: 100px;
overflow: scroll;
}
</style>
</head>
<body>
<div id="content">
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This is demo text.This is demo text.This is demo text.
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</div>
<p id = "myScroll"> </p>
<script>
document.getElementById("content").onscroll = function() {myFunction()};
function myFunction() {
document.getElementById("myScroll").innerHTML = "Scroll successfull!.";
}
</script>
</body>
</html>