Drag & Drop APIで親要素を並び変える #JavaScript

Drag & Drop API使用して要素を並び替える際に、
ドロップが子要素にもできてしまっていました。

その回避策として子要素にはドロップをできないようにしました。

change.html

<!DOCTYPE html>
<html lang="ja">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Drag & Drop Example</title>
    <script src="main.js"></script>
    <style>
        #container {
            display: flex;
            flex-direction: column;
            width: 300px;
            margin: 0 auto;
        }
        .item {
            background-color: #f0f0f0;
            border: 1px solid #ccc;
            padding: 10px;
            margin: 5px;
            cursor: pointer;
        }
    </style>
</head>
<body>
    <div id="container">
        <div class="item" draggable="true">
            <div>Item</div>
            <div>1</div>
        </div>
        <div class="item" draggable="true">
            <div>Item</div>
            <div>2</div>
        </div>
        <div class="item" draggable="true">
            <div>Item</div>
            <div>3</div>
        </div>
    </div>
</body>
</html>

main.js

window.addEventListener('DOMContentLoaded', function() {
    const container = document.getElementById('container');
    let draggingItem = null;

    container.addEventListener('dragstart', (e) => {
        draggingItem = e.target;
        e.dataTransfer.setData('text/plain', e.target.innerText);
    });

    container.addEventListener('dragover', (e) => {
        e.preventDefault();
    });

    container.addEventListener('dragenter', (e) => {
        if (e.target !== container && e.target.classList.contains('item')) {
            e.target.style.border = '2px dashed #ccc';
        }
    });

    container.addEventListener('dragleave', (e) => {
        if (e.target !== container && e.target.classList.contains('item')) {
            e.target.style.border = '';
        }
    });

    container.addEventListener('drop', (e) => {
        e.preventDefault();
        if (e.target !== container && e.target.classList.contains('item')) {
            e.target.style.border = '';
            draggingItem.innerText = e.target.innerText;
            e.target.innerText = e.dataTransfer.getData('text/plain');
        }
    });
})