HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>maxlength — 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 0.75rem; font-size: 1.25rem; color: #0f172a; }
    label { display: block; margin-bottom: 0.35rem; font-weight: 500; font-size: 0.875rem; }
    input {
      width: 100%;
      max-width: 320px;
      padding: 0.5rem 0.65rem;
      font: inherit;
      border: 1px solid #cbd5e1;
      border-radius: 6px;
    }
    button {
      margin-top: 0.75rem;
      padding: 0.5rem 1rem;
      font: inherit;
      cursor: pointer;
      border-radius: 6px;
      border: 1px solid #cbd5e1;
      background: #fff;
    }
    .status {
      margin-top: 0.75rem;
      font-size: 0.8125rem;
      color: #64748b;
      max-width: 420px;
    }
    code { background: #e2e8f0; padding: 0.1rem 0.35rem; border-radius: 4px; }
  </style>
</head>
<body>
  <h1>element.maxLength in JavaScript</h1>
  <label for="dynamicField">Comment:</label>
  <input type="text" id="dynamicField" maxlength="10" placeholder="Start with max 10">
  <button type="button" id="extendBtn">Raise maxLength to 25</button>
  <p class="status" id="status">Current maxLength: 10</p>

  <script>
    var field = document.getElementById("dynamicField");
    var status = document.getElementById("status");
    document.getElementById("extendBtn").addEventListener("click", function () {
      field.maxLength = 25;
      status.textContent = "maxLength updated to 25 via element.maxLength property.";
    });
  </script>
</body>
</html>

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HTML maxlength Attribute — Dynamic maxLength with JavaScript