HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>live on keyup</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 420px; }
    label { display: block; margin-bottom: 6px; font-weight: 600; }
    input { width: 100%; padding: 10px 12px; border: 2px solid #cbd5e1; border-radius: 6px; font-size: 16px; box-sizing: border-box; margin-bottom: 12px; }
    #status { font-family: monospace; font-size: 14px; color: #334155; min-height: 20px; }
    #hint { color: #64748b; font-size: 14px; margin-top: 10px; }
  </style>
</head>
<body>
  <label for="search">Search</label>
  <input type="text" id="search" placeholder="Type — status updates on keyup">
  <p id="status">Length: 0</p>
  <p id="hint">Value is up to date on keyup — character already inserted.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#search").on("keyup", function(event) {
      var len = $(this).val().length;
      var lastKey = event.which === 8 ? "Backspace" : String.fromCharCode(event.which);
      $("#status").text("Length: " + len + " | Last key released: " + lastKey);
    });
  </script>
</body>
</html>

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jQuery keyup — live field update on release (Try It)