HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>.val().change()</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 400px; }
    label { display: block; margin-bottom: 6px; font-weight: 600; }
    #tier { width: 100%; padding: 10px 12px; border: 2px solid #10b981; border-radius: 6px; font-size: 16px; box-sizing: border-box; margin-bottom: 12px; }
    #set-pro { padding: 10px 16px; background: #6366f1; color: #fff; border: none; border-radius: 6px; cursor: pointer; }
    #out { margin-top: 12px; color: #047857; font-weight: bold; }
  </style>
</head>
<body>
  <label for="tier">Subscription tier</label>
  <select id="tier">
    <option value="free">Free</option>
    <option value="pro">Pro</option>
    <option value="enterprise">Enterprise</option>
  </select>
  <br><br>
  <button type="button" id="set-pro">Set to Pro via script</button>
  <div id="out">Click the button — .val("pro").change() runs the handler.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#tier").change(function() {
      $("#out").text("Tier is now: " + $(this).val());
    });
    $("#set-pro").click(function() {
      $("#tier").val("pro").change();
    });
  </script>
</body>
</html>

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jQuery .val().change() — trigger after programmatic update (Try It)