HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>Toggle draggable</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}#dynamicDraggable{width:140px;height:100px;background:#0ea5e9;color:#fff;display:flex;align-items:center;justify-content:center;border-radius:8px;cursor:grab;user-select:none;font-size:.875rem;font-weight:600}#dynamicDraggable.is-off{background:#94a3b8;cursor:not-allowed}.controls{margin-top:.75rem;display:flex;gap:.5rem}button{font:inherit;padding:.35rem .75rem;border:1px solid #cbd5e1;border-radius:6px;background:#fff;cursor:pointer}button.is-active{background:#2563eb;color:#fff;border-color:#2563eb}p{font-size:.875rem;color:#64748b;max-width:520px;margin-top:1rem}</style>

</head>

<body>

  <h1>Toggle draggable in JavaScript</h1>

  <div id=dynamicDraggable>Drag me</div>

  <div class=controls>

    <button type=button id=btnOn class=is-active>draggable = true</button>

    <button type=button id=btnOff>draggable = false</button>

  </div>

  <p id=status>draggable: true</p>

  <script>var box=document.getElementById("dynamicDraggable"),status=document.getElementById("status"),btnOn=document.getElementById("btnOn"),btnOff=document.getElementById("btnOff");function setDraggable(t){box.draggable=t,box.classList.toggle("is-off",!t),btnOn.classList.toggle("is-active",t),btnOff.classList.toggle("is-active",!t),status.textContent="draggable: "+t}box.draggable=!0,btnOn.addEventListener("click",(function(){setDraggable(!0)})),btnOff.addEventListener("click",(function(){setDraggable(!1)}))</script>

</body>

</html>

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HTML draggable Attribute — Toggle with JavaScript