HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>focus handler</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 360px; }
    label { display: block; margin-bottom: 6px; font-weight: 600; }
    #target { width: 100%; padding: 10px 12px; border: 2px solid #3b82f6; border-radius: 6px; font-size: 16px; box-sizing: border-box; }
    #out { margin-top: 12px; color: #1d4ed8; font-weight: bold; }
  </style>
</head>
<body>
  <label for="target">Click or tab into this field:</label>
  <input type="text" id="target" placeholder="Focus me">
  <div id="out">Waiting for focus…</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#target").on("focus", function() {
      $("#out").text("Handler for focus called.");
      alert("Handler for focus called.");
    });
  </script>
</body>
</html>

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jQuery focus event — bind handler (Try It)