HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>context — modern delegation</title>
  <style>
    #feed { max-width: 320px; font-family: system-ui, sans-serif; }
    .item { padding: 8px; border: 1px solid #e2e8f0; margin-bottom: 6px; cursor: pointer; }
    .item.is-active { background: #ecfdf5; border-color: #0d9488; }
    button { margin-top: 8px; }
  </style>
</head>
<body>
  <div id="feed">
    <div class="item">Post 1</div>
    <div class="item">Post 2</div>
  </div>
  <button type="button" id="add">Add post</button>
  <p id="status">Click a post</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    jQuery(function ($) {
      $("#feed").on("click", ".item", function () {
        $(".item").removeClass("is-active");
        $(this).addClass("is-active");
        $("#status").text("Selected: " + $(this).text());
      });
      $("#add").on("click", function () {
        var n = $("#feed .item").length + 1;
        $("<div>", { "class": "item", text: "Post " + n }).appendTo("#feed");
      });
    });
  </script>
</body>
</html>

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.context — Modern .on() Delegation (Try It)