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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>.change(eventData, handler)</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 400px; }
    label { display: block; margin-bottom: 6px; font-weight: 600; }
    .plan-select { width: 100%; padding: 10px 12px; border: 2px solid #cbd5e1; border-radius: 6px; font-size: 16px; box-sizing: border-box; margin-bottom: 12px; }
    #out { padding: 10px; background: #eff6ff; border-radius: 6px; color: #1e40af; font-family: monospace; font-size: 14px; min-height: 1.2em; }
  </style>
</head>
<body>
  <label for="plan-a">Plan A</label>
  <select class="plan-select" id="plan-a">
    <option value="basic">Basic</option>
    <option value="pro">Pro</option>
  </select>
  <label for="plan-b">Plan B</label>
  <select class="plan-select" id="plan-b">
    <option value="basic">Basic</option>
    <option value="pro">Pro</option>
  </select>
  <div id="out">Change a plan select…</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $(".plan-select").change({ currency: "USD" }, function(event) {
      var plan = $(this).val();
      $("#out").text("Plan: " + plan + " | currency: " + event.data.currency);
    });
  </script>
</body>
</html>

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jQuery .change(eventData, handler) — pass metadata (Try It)