Old school D3 from simpler times

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mbostock

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Smooth Scrolling

This example uses a custom tween that interpolates the window’s vertical scroll offset.

<!DOCTYPE html>
<meta charset="utf-8">
<style>

body {
  padding: 40px;
}

h1, h2 {
  font-family: "Helvetica Neue";
  padding-bottom: 120px;
}

h2 {
  padding-bottom: 240px;
}

</style>

<h1>Smooth scrolling!</h1>

<h2>Get ready to scroll, in 3, 2, 1…</h2>

<h1>Whee!</h1>
<h1>Whee!</h1>
<h1>Whee!!!</h1>
<h1>Whee!!!!!</h1>
<h1>Whee!!!</h1>
<h1>Whee!!</h1>
<h1>Whee!!!</h1>
<h1>Whee!!!!!</h1>
<h1>Whee!!!</h1>
<h1>Whee!!</h1>
<h1>Whee!!!</h1>
<h1>Whee!!!!!</h1>
<h1>Whee!!!</h1>
<h1>Whee!!</h1>
<h1>Whee!!!</h1>
<h1>Whee!!!!!</h1>
<h1>Whee!!!</h1>
<h1>Whee!!</h1>
<h1>Whee!!</h1>
<h1>Whee!!</h1>
<h1>Whee!!</h1>
<h1>Whee!!!</h1>
<h1>Whee!!!!!</h1>
<h1>Whee!!!!!!!!!!!!!</h1>
<h1>Whee!!!!!</h1>
<h1>Whee!!!</h1>
<h1>Whee!!</h1>
<h1>Whee!!!</h1>
<h1>Whee!!!!!</h1>
<h1>Whee!!!</h1>
<h1>Whee!!</h1>
<h1>Whee!!!</h1>
<h1>Whee!!!!!</h1>
<h1>Whee!!!!!!!!!!!!!!!!</h1>
<h1>Whee!!!!!</h1>
<h1>Whee!!!</h1>
<h1>Whee!!</h1>
<h1>Whee!!!</h1>
<h1>Whee!!!!!</h1>
<h1>Whee!!!</h1>
<h1>Whee!!</h1>
<h1>Whee!!!</h1>
<h1>Whee!!!!!</h1>
<h1>Whee!!!</h1>
<h1>Whee!!</h1>

<h2>All done!</h2>

<script src="//d3js.org/d3.v3.min.js"></script>
<script>

d3.transition()
    .delay(1500)
    .duration(7500)
    .tween("scroll", scrollTween(document.body.getBoundingClientRect().height - window.innerHeight));

function scrollTween(offset) {
  return function() {
    var i = d3.interpolateNumber(window.pageYOffset || document.documentElement.scrollTop, offset);
    return function(t) { scrollTo(0, i(t)); };
  };
}

</script>

https://d3js.org/d3.v3.min.js