HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>submit migration</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 440px; }
    label { display: block; margin-bottom: 6px; font-weight: 600; }
    form { padding: 12px; border: 2px solid #cbd5e1; border-radius: 8px; margin-bottom: 14px; }
    #legacy-form { border-color: #f59e0b; }
    #modern-form { border-color: #10b981; }
    input { width: 100%; padding: 10px 12px; border: 1px solid #e2e8f0; border-radius: 6px; font-size: 16px; box-sizing: border-box; margin-bottom: 10px; }
    button { padding: 8px 14px; background: #6366f1; color: #fff; border: none; border-radius: 6px; cursor: pointer; }
    #out { padding: 10px; background: #f8fafc; border-radius: 6px; color: #334155; min-height: 1.2em; }
  </style>
</head>
<body>
  <form id="legacy-form">
    <label>Legacy (.submit)</label>
    <input type="text" placeholder="Then submit">
    <button type="submit">Submit</button>
  </form>
  <form id="modern-form">
    <label>Modern (.on submit)</label>
    <input type="text" placeholder="Then submit">
    <button type="submit">Submit</button>
  </form>
  <div id="out">Submit either form.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#legacy-form").submit(function(event) {
      event.preventDefault();
      $("#out").text("Legacy: .submit(function(){ ... }) — deprecated since jQuery 3.3.");
    });
    $("#modern-form").on("submit", function(event) {
      event.preventDefault();
      $("#out").text("Modern: .on('submit', function(){ ... }) — use this for new code.");
    });
  </script>
</body>
</html>

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jQuery .submit(fn) vs .on('submit', fn) — migration (Try It)