HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>submit handler</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; }
    button { padding: 10px 16px; background: #6366f1; color: #fff; border: none; border-radius: 6px; cursor: pointer; }
    #hint { color: #64748b; font-size: 14px; margin-top: 10px; }
  </style>
</head>
<body>
  <form id="target" action="/demo" method="get">
    <label for="name">Name</label>
    <input type="text" id="name" name="name" placeholder="Your name">
    <button type="submit">Submit</button>
  </form>
  <p id="hint">Submit runs handler — page stays (preventDefault).</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#target").on("submit", function(event) {
      alert("Handler for submit called.");
      event.preventDefault();
    });
  </script>
</body>
</html>

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jQuery submit event — bind handler on #target (Try It)