HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>change delegation</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 420px; }
    label { display: block; margin-bottom: 6px; font-weight: 600; }
    select { width: 100%; padding: 10px 12px; border: 2px solid #cbd5e1; border-radius: 6px; font-size: 16px; box-sizing: border-box; margin-bottom: 12px; }
    #add { padding: 8px 14px; background: #6366f1; color: #fff; border: none; border-radius: 6px; cursor: pointer; margin-bottom: 12px; }
    #log { padding: 10px; background: #eff6ff; border-radius: 6px; color: #1e40af; font-weight: 600; min-height: 1.2em; }
  </style>
</head>
<body>
  <form id="order-form">
    <label for="size">Size</label>
    <select id="size">
      <option>Small</option>
      <option>Medium</option>
      <option>Large</option>
    </select>
    <div id="extra-selects"></div>
  </form>
  <button type="button" id="add">Add flavor select</button>
  <div id="log">Change any select…</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var n = 0;
    $("#order-form").on("change", "select", function() {
      var label = $(this).find("option:selected").text();
      $("#log").text("Selected: " + label);
    });
    $("#add").on("click", function() {
      n += 1;
      $("#extra-selects").append(
        '<label>Flavor ' + n + '</label>' +
        '<select><option>Vanilla</option><option>Strawberry</option></select>'
      );
    });
  </script>
</body>
</html>

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jQuery change event — delegated select handler (Try It)