JAVASCRIPT30/02 - CSS Variables.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Scoped CSS Variables and JS</title>
</head>
<body>
  <h2><span class="color">Update</span> CSS <span class="color">Variables</span> with <span class='h1'>JS</span></h2>

  <div class="controls">
    <label for="spacing">Spacing:</label>
    <input id="spacing" type="range" name="spacing" min="10" max="200" value="10" data-sizing="px" >

    <label for="blur">Blur:</label>
    <input id="blur" type="range" name="blur" min="0" max="25" value="10" data-sizing="px">

    <label for="base">Base Color</label>
    <input id="base" type="color" name="base" value="#ffc600">
  </div>

  <img src="https://source.unsplash.com/7bwQXzbF6KE/800x500">

  <style>

    :root{
      --base:#ffc600;
      --spacing:10px;
      --blur:10px;
    }
    img{
      padding:var(--spacing);
      background:var(--base);
      filter:blur(var(--blur));
    }
    .h1{
      color:var(--base);
    }
    span.color{
      color:var(--base);
    }

    /*
      misc styles, nothing to do with CSS variables
    */

    body {
      text-align: center;
      background: #193549;
      color: white;
      font-family: 'helvetica neue', sans-serif;
      font-weight: 100;
      font-size: 50px;
    }

    .controls {
      margin-bottom: 50px;
    }

    a{
      color:var(--base);
      text-decoration:none;
    }

    input {
      width:100px;
    }
  </style>

  <script>
    
    const inputs = document.querySelectorAll('.controls input');
    // querySelctorAll하면 nodeList로 나오는데 정확히는 배열은 아니다
    // 나중에 배열로 바꿔야 하겠지만 지금은 필요없고, 차이점은 노드리스트는 배열에 비해 메소드가 제한적이다
   
    function handleUpdate(){
      // console.log(this.value);
      //const test = this; //함수안에서 this는 window?라고 알고 있는데 input인듯 ..bind../?
      const suffix = this.dataset.sizing || '';
      document.documentElement.style.setProperty(`--${this.name}`,this.value + suffix);
    }
   
    inputs.forEach(input => input.addEventListener('change', handleUpdate)); 
    inputs.forEach(input => input.addEventListener('mousemove', handleUpdate));

    // addEventListener연습
    // document.querySelector('img').addEventListener('click',
    //   function (){
    //     this.style.display =  'none';
    //   }
    // )

  </script>

</body>
</html>