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Javascript - Scroll Animation 본문

Javascript

Javascript - Scroll Animation

HiroDaegu 2021. 9. 29. 00:38
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아래로 스크롤하면 content 박스가 좌우에서 추가되고, 위로 스크롤하면 좌우 방향으로 사라지는 animation

<!DOCTYPE html>
<html lang="ko">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Scroll Animation</title>
    <link rel="stylesheet" href="style.css" />
    <script defer src="main.js"></script>
  </head>
  <body>
    <h1>Scroll to see the animation</h1>
    <div class="box">
      <h2>content</h2>
    </div>
    <div class="box">
      <h2>content</h2>
    </div>
    <div class="box">
      <h2>content</h2>
    </div>
    <div class="box">
      <h2>content</h2>
    </div>
    <div class="box">
      <h2>content</h2>
    </div>
    <div class="box">
      <h2>content</h2>
    </div>
    <div class="box">
      <h2>content</h2>
    </div>
    <div class="box">
      <h2>content</h2>
    </div>
    <div class="box">
      <h2>content</h2>
    </div>
    <div class="box">
      <h2>content</h2>
    </div>
  </body>
</html>
@import url('https://fonts.googleapis.com/css2?family=Roboto&display=swap');

* {
  box-sizing: border-box;
}

body {
  background-color: #efedd6;
  font-family: 'Roboto', sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 0;
  overflow-x: hidden;
}

h1 {
  margin: 10px;
}

.box {
  background-color: #4682b4;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 400px;
  height: 200px;
  margin: 10px;
  border-radius: 10px;
  box-shadow: 2px 4px 5px rgba(0, 0, 0, .3);
  transform: translateX(400%);
  transition: transform .4s ease;
}

.box:nth-of-type(even) {
  transform: translateX(-400%);
}

.box.show {
  transform: translateY(0);
}

.box h2 {
  font-size: 42px;
}
const boxes = document.querySelectorAll(".box");

window.addEventListener("scroll", () => {
  const triggerBottom = window.innerHeight / 5 * 4;
  boxes.forEach(box => {
    const boxTop = box.getBoundingClientRect().top;

    if(boxTop < triggerBottom) {
      box.classList.add("show");
    } else {
      box.classList.remove("show");
    }
  })
})
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