HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>click delegation</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    ul { list-style: none; padding: 0; }
    li { padding: 8px 12px; margin: 4px 0; background: #e0e7ff; border-radius: 4px; cursor: pointer; }
    li.done { background: #d1fae5; text-decoration: line-through; }
    button { margin-top: 10px; padding: 8px 14px; cursor: pointer; }
    #out { margin-top: 12px; color: #4338ca; font-weight: bold; }
  </style>
</head>
<body>
  <ul id="list">
    <li>Task one</li>
    <li>Task two</li>
  </ul>
  <button type="button" id="add">Add task</button>
  <div id="out">Click a task to mark done. New tasks work too — delegation!</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var n = 3;
    $("#list").on("click", "li", function() {
      $(this).toggleClass("done");
      $("#out").text("Toggled: " + $(this).text());
    });
    $("#add").on("click", function() {
      $("#list").append("<li>Task " + n++ + "</li>");
    });
  </script>
</body>
</html>

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jQuery click event — delegation with .on() (Try It)