HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>select change summary</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 360px; }
    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; }
    #summary { margin-top: 14px; padding: 12px; background: #fef2f2; color: #dc2626; font-weight: bold; border-radius: 6px; min-height: 1.2em; }
  </style>
</head>
<body>
  <label for="flavor">Pick a flavor</label>
  <select id="flavor">
    <option>Chocolate</option>
    <option>Caramel</option>
    <option>Fudge</option>
    <option>Cookie</option>
  </select>
  <div id="summary"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("select").on("change", function() {
      var str = "";
      $("select option:selected").each(function() {
        str += $(this).text() + " ";
      });
      $("#summary").text(str.trim());
    }).trigger("change");
  </script>
</body>
</html>

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jQuery change event — select summary with initial trigger (Try It)