Intersection Observer Text Ghost

by Louis Walch

HTML

<section style="background-color: #555; min-height: 700px;"></section>
<section class="ghost">
    <h1>Aliquam lorem ante, dapibus in, viverra quis, feugiat a, tellus.</h1>
    <p>Phasellus viverra nulla ut metus varius laoreet. Quisque rutrum. Aenean imperdiet. Etiam ultricies nisi vel augue.</p>
</section>
<section class="ghost">
    <p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Donec quam felis, ultricies nec, pellentesque eu, pretium quis, sem. Nulla consequat massa quis enim. Donec pede justo, fringilla vel, aliquet nec, vulputate eget, arcu.</p>
</section>
<section class="ghost">
    <p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Donec quam felis, ultricies nec, pellentesque eu, pretium quis, sem. Nulla consequat massa quis enim. Donec pede justo, fringilla vel, aliquet nec, vulputate eget, arcu.</p>
</section>
<section class="ghost">
    <div class="image"></div>
<section class="ghost">
    <p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Donec quam felis, ultricies nec, pellentesque eu, pretium quis, sem. Nulla consequat massa quis enim. Donec pede justo, fringilla vel, aliquet nec, vulputate eget, arcu.</p>
</section>

CSS

BODY {
    font-family: sans-serif;
}

SECTION {
    margin-bottom: 100px;
}

H1 {
    font-size: 40px;
    text-wrap: balance;
}
P {
    max-width: 600px;
    text-align: justify;
    line-height: 140%;
}

.image {
    transition: background-color 1200ms linear;
    aspect-ratio: 1;
    background-color: #EFEFEF;
    max-width: 200px;
}

.ghost {
    transition: color 1200ms linear;
    color: #EFEFEF;
}

.ghost.show {
    color: #000;
}
.ghost.show .image {
    background-color: orange;
}

JavaScript

let ghosts = document.querySelectorAll(".ghost");

let callback = (entries, observer) => {
  entries.forEach(entry => {
    if (entry.isIntersecting) {
    console.log(entry);
    	entry.target.classList.add('show');
      console.log(`Hey, I'm intersecting`)
    }
  });
}

let observer = new IntersectionObserver(callback, {
  root: null,
  rootMargin: '0px',
  threshold: 1,
});




ghosts.forEach(ghost => observer.observe(ghost));