Bootstrap Snippet How to Animate on Scroll With Vanilla JavaScript

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<header class="container">
  <h1>How to Animate on Scroll With Vanilla JavaScript</h1>
  <h2>Scroll to see the effects
    <p class="animate-arrow">↓
    </p>
  </h2>
</header>
<section class="scroll-container">
  <div class="scroll-element js-scroll fade-in">
  </div>
  <div class="scroll-caption">
    This animation fades in.
  </div>
</section>
<section class="scroll-container">
  <div class="scroll-element js-scroll fade-in-bottom">
  </div>
  <div class="scroll-caption">
    This animation slides in to the top.
  </div>
</section>
<section class="scroll-container">
  <div class="scroll-element js-scroll slide-left">
  </div>
  <div class="scroll-caption">
    This animation slides in from the left.
  </div>
</section>
<section class="scroll-container">
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@import url("https://fonts.googleapis.com/css2?family=Merriweather&family=Merriweather+Sans:wght@300&display=swap");
/*General styling for structure*/
body {
  margin: 0;
  font-family: "Merriweather Sans", sans-serif;
}
.container {
  max-width: 1280px;
  width: 95%;
  margin: 0 auto;
}
header {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  font-family: "Merriweather", serif;
  height: 100vh;
}
header h2 {
  font-weight: 400;
}
.scroll-container {
  height: 100vh;
  min-height: 450px;
  padding: 2rem 1rem;
  display: flex;
  align-items: center;
  box-sizing: border-box;
}
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const scrollElements = document.querySelectorAll(".js-scroll");
const elementInView = (el, dividend = 1) => {
  const elementTop = el.getBoundingClientRect().top;
  return (
    elementTop <=
    (window.innerHeight || document.documentElement.clientHeight) / dividend
  );
};
const elementOutofView = (el) => {
  const elementTop = el.getBoundingClientRect().top;
  return (
    elementTop > (window.innerHeight || document.documentElement.clientHeight)
  );
};
const displayScrollElement = (element) => {
  element.classList.add("scrolled");
};
const hideScrollElement = (element) => {
  element.classList.remove("scrolled");
};
const handleScrollAnimation = () => {
  scrollElements.forEach((el) => {
    if (elementInView(el, 1.25)) {
      displayScrollElement(el);
    } else if (elementOutofView(el)) {
      hideScrollElement(el)
    }
  })
}
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"How to Animate on Scroll With Vanilla JavaScript - Best one"
Bootstrap 4.1.1 Snippet by naimansari

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Questions / Comments:

"How to Animate on Scroll With Vanilla JavaScript - Best one" Bootstrap 4.1.1 Snippet by naimansari

Related: See More

Questions / Comments:

"How to Animate on Scroll With Vanilla JavaScript - Best one"
Bootstrap 4.1.1 Snippet by naimansari