HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>.keyup() trigger</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 420px; }
    input { width: 100%; padding: 10px 12px; border: 2px solid #cbd5e1; border-radius: 6px; font-size: 16px; box-sizing: border-box; margin-bottom: 12px; }
    button { padding: 10px 16px; background: #6366f1; color: #fff; border: none; border-radius: 6px; cursor: pointer; }
    #out { margin-top: 12px; font-family: monospace; font-size: 14px; color: #334155; }
  </style>
</head>
<body>
  <input type="text" id="target" placeholder="Target input">
  <button type="button" id="fire">Fire .keyup()</button>
  <p id="out">Count: 0</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var count = 0;
    $("#target").keyup(function() {
      count++;
      $("#out").text("Target keyup handler fired (count: " + count + ")");
    });
    $("#fire").click(function() {
      $("#target").keyup();
    });
  </script>
</body>
</html>

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jQuery .keyup() — trigger keyup (Try It)