HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>trigger custom event demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 420px; }
    #foo { padding: 12px; background: #dcfce7; border-radius: 6px; cursor: pointer; font-weight: bold; }
    #log { margin-top: 12px; color: #7c2d12; font-weight: bold; min-height: 2em; }
    button { margin-top: 10px; padding: 8px 14px; cursor: pointer; }
  </style>
</head>
<body>
  <div id="foo">Click or use Trigger button</div>
  <button type="button" id="fire">Trigger custom event</button>
  <div id="log">Waiting for custom event...</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#foo").on("custom", function(event, param1, param2) {
      $("#log").text("custom event: param1=" + param1 + ", param2=" + param2);
    });
    $("#fire").on("click", function() {
      $("#foo").trigger("custom", ["Custom", "Event"]);
    });
  </script>
</body>
</html>

Lines: 0 | Characters: 0

Live Preview Auto-refresh on Run

jQuery .trigger('custom', [...]) — custom event (Try It)