HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>readonly — dynamic JS</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}label{display:block;margin-bottom:.35rem;font-weight:500;font-size:.875rem}input{width:100%;max-width:360px;padding:.5rem .65rem;font:inherit;border:1px solid #cbd5e1;border-radius:6px}button{margin-top:.75rem;margin-right:.5rem;padding:.5rem 1rem;font:inherit;cursor:pointer;border-radius:6px;border:none;background:#2563eb;color:#fff}button.secondary{background:#fff;border:1px solid #cbd5e1;color:#334155}#status{margin-top:.75rem;padding:.75rem 1rem;border-radius:8px;font-size:.875rem;max-width:360px;background:#f0fdf4;border:1px solid #bbf7d0;color:#166534}</style>

</head>

<body>

  <h1>input.readOnly</h1>



  <label for=dynamicField>Order reference:</label>

  <input id=dynamicField value="Editable until locked">



  <button type=button id=lockBtn>Lock field</button>

  <button type=button id=unlockBtn class=secondary>Unlock field</button>



  <p id=status aria-live=polite>readOnly: false</p>



  <script>var field=document.getElementById("dynamicField"),status=document.getElementById("status");document.getElementById("lockBtn").addEventListener("click",(function(){field.readOnly=!0,status.textContent="readOnly: true — field locked"})),document.getElementById("unlockBtn").addEventListener("click",(function(){field.readOnly=!1,status.textContent="readOnly: false — field editable"}))</script>

</body>

</html>

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HTML readonly Attribute — dynamic JavaScript