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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>.submit(eventData, handler)</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 440px; }
    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; }
    #out { margin-top: 10px; padding: 10px; background: #eff6ff; border-radius: 6px; color: #1e40af; font-family: monospace; font-size: 14px; min-height: 1.2em; }
  </style>
</head>
<body>
  <form id="login">
    <label for="user">Username</label>
    <input type="text" id="user" name="user" value="jane">
    <br><br>
    <button type="submit">Submit</button>
  </form>
  <div id="out">Submit to see event.data.formId.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#login").submit({ formId: "login" }, function(event) {
      event.preventDefault();
      $("#out").text("Form: " + event.data.formId + " | user: " + $("#user").val());
    });
  </script>
</body>
</html>

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jQuery .submit(eventData, handler) — form metadata (Try It)