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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>trigger extra params demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 480px; }
    p { padding: 12px; background: #fef3c7; border-radius: 6px; cursor: pointer; }
    p:hover { background: #fde68a; }
    button { margin: 8px 8px 8px 0; padding: 8px 14px; cursor: pointer; }
    #log { margin-top: 12px; color: #1d4ed8; font-weight: bold; }
  </style>
</head>
<body>
  <p>Click me (a and b will be undefined)</p>
  <button type="button" id="trigger-btn">Trigger with ["foo", "bar"]</button>
  <div id="log">Click paragraph or trigger button.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("p").on("click", function(event, a, b) {
      $("#log").text("a=" + a + ", b=" + b);
    });
    $("#trigger-btn").on("click", function() {
      $("p").trigger("click", ["foo", "bar"]);
    });
  </script>
</body>
</html>

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jQuery .trigger('click', ['foo','bar']) — extra params (Try It)