HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>guard helper demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }
    #btn { padding: 10px 18px; cursor: pointer; }
    #log { margin-top: 12px; padding: 12px; background: #f1f5f9; border-radius: 6px; font-size: 14px; line-height: 1.8; }
    #log div { padding: 2px 0; }
  </style>
</head>
<body>
  <button type="button" id="btn">Click me</button>
  <div id="log">Click the button.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    function logBubbleState(event, label) {
      if (event.isPropagationStopped()) {
        return label + ": propagation already stopped";
      }
      return label + ": propagation still active";
    }
    $("#btn").on("click", function (event) {
      $("#log").html("");
      $("#log").append("<div>" + logBubbleState(event, "before") + "</div>");
      event.stopPropagation();
      $("#log").append("<div>" + logBubbleState(event, "after") + "</div>");
    });
  </script>
</body>
</html>

Lines: 0 | Characters: 0

Live Preview Auto-refresh on Run

jQuery event.isPropagationStopped() — guard helper (Try It)