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<head>

  <meta charset=UTF-8>

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

  <title>minlength — 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:320px;padding:.5rem .65rem;font:inherit;border:1px solid #cbd5e1;border-radius:6px}button{margin-top:.75rem;padding:.5rem 1rem;font:inherit;cursor:pointer;border-radius:6px;border:1px solid #cbd5e1;background:#fff}.status{margin-top:.75rem;font-size:.8125rem;color:#64748b;max-width:420px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

</head>

<body>

  <h1>element.minLength in JavaScript</h1>

  <label for=dynamicField>Comment:</label>

  <input id=dynamicField minlength=3 placeholder="Start with min 3">

  <button type=button id=raiseBtn>Raise minLength to 10</button>

  <p class=status id=status>Current minLength: 3</p>



  <script>var field=document.getElementById("dynamicField"),status=document.getElementById("status");document.getElementById("raiseBtn").addEventListener("click",(function(){field.minLength=10,status.textContent="minLength updated to 10 via element.minLength property."}))</script>

</body>

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HTML minlength Attribute — Dynamic minLength with JavaScript