One more thing that Web 2.0 brought us was simplicity. The overall page became more simple and the use of CSS was expected over multiple frames and tables for the layout.
The problem with the XMLHttpRequest object is that it does not support promises natively. So, in order to work with the XMLHttpRequest object, you need to wrap it with a promise.
This click event brings the page via AJAX and filters only the content of the requested page. The downside of this approach is that the whole page is requested and then filtered by the jQuery selector.