Moving Placeholder on Focus with HTML, CSS & JavaScript

Web Design & Web Development

Demo

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Code

HTML

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,initial-scale=1">
    <title>Moving Placeholder on Focus</title>
    <link rel="stylesheet" type="text/css" href="https://demo.plantpot.works/assets/css/normalize.css">
    <link rel="stylesheet" href="https://use.typekit.net/opg3wle.css">
    <link rel="stylesheet" type="text/css" href="style.css">
  </head>
  <body>
    <div id="container">
      <form class="form">
        <input id="formInput" class="form__input" type="text" name="text">
        <label id="formPlaceholder" class="form__placeholder">Placeholder</label>
      </form>
    </div>
  </body>
</html>

CSS

@charset "utf-8";
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  font-size: 16px;
}
body {
  background-color: #e6d37e;
  font-family: futura-pt, sans-serif;
  -webkit-tap-highlight-color: rgba(0,0,0,0);
}
#container {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  width: 100%;
  height: 100vh;
  padding: 20px;
}
.form {
  position: relative;
  width: 100%;
  max-width: 400px;
}
.form__input {
  width: 100%;
  height: 50px;
  padding: 0 10px;
  border: none;
  border-bottom: 2px solid #10660d;
  background-color: #f8f8ec;
  font-size: 1.125rem;
  outline: none;
}
.form__placeholder {
  position: absolute;
  top: 15px;
  left: 10px;
  color: #ccc;
  font-size: 1.125rem;
  transition: .4s;
}
.form__placeholder.moved {
  top: -20px;
  left: 0;
  color: #10660d;
  font-size: 1rem;
}

JavaScript

var formInput = document.getElementById("formInput");
var formPlaceholder = document.getElementById("formPlaceholder");

formInput.addEventListener('focusin', () => {
  if(formInput.value.length === 0) {
    formPlaceholder.classList.add("moved");
  }
});

formInput.addEventListener('focusout', () => {
  if(formInput.value.length === 0) {
    formPlaceholder.classList.remove("moved");
  } else {
    formPlaceholder.classList.add("moved");
  }
});