21-drag-n-drop

html

<!DOCTYPE html>
<html lang="en">
<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">
    <link rel="stylesheet" href="style.css">
    <title>Document</title>
</head>
<body>
    <div class="empty">
        <div class="fill" draggable="true"></div>
    </div>
    <div class="empty"></div>
    <div class="empty"></div>
    <div class="empty"></div>
    <div class="empty"></div>
    <script src="./script.js"></script>
</body>
</html>

css

* {
    box-sizing: border-box;
  }


body{
    background-color: steelblue;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    overflow: hidden;
    margin: 0;
}

.empty{
    height: 150px;
    width: 150px;
    margin: 10px;
    border: solid 3px black;
    background: white;
}

.fill{
    background-image: url('https://source.unsplash.com/random/150x150');
    height: 145px;
    width: 145px;
    cursor: pointer;
}

.hold{
    border: solid 5px #ccc;
}

.hovered{
    background-color: #333;
    border-color: white;
    border-style: dashed;
}

@media (max-width: 800px) {
    body {
      flex-direction: column;
    }
  }

const fill = document.querySelector('.fill')
const empties = document.querySelectorAll('.empty')

fill.addEventListener('dragstart',dragStart)
fill.addEventListener('dragend',dragEnd)


for(const empty of empties){
    empty.addEventListener('dragover',dragOver)
    empty.addEventListener('dragenter',dragEnter)
    empty.addEventListener('dragleave',dragleave)
    empty.addEventListener('drop',dragDrop)
}

function dragStart(){
    this.className += ' hold'
    setTimeout(()=>this.className='invisible',0)
}

function dragEnd(){
    this.className='fill'
}

function dragOver(e){
    e.preventDefault()
}

function dragEnter(e){
    e.preventDefault()
    this.className += ' hovered'
}

function dragleave(){
    this.className='empty'
}

function dragDrop(){
    this.className='empty'
    this.append(fill)
}