This example revisits our original Hello World example to show how you can easily change a postback-based form and interactions into AJAX-postback based ones.

Whereas before, we executed a QServerAction on the button's click, we have now changed that to a QAjaxAction. Everything else remains the same.

The result is the exact same interaction, but now performed Asynchronously via AJAX. Note that after clicking the button, the page doesn't "refresh" -- but the label's contents changes as defined in the PHP method btnButton_Click.