AJAX is an approach for building dynamic web content on the client side . In Liftweb , we can implement this approach either by AJAX or by Comet . Comet is like AJAX , except in opposite direction .
AJAX model increases the richness of the User Experience for a single client at a time, Comet can do the same for multiple users.
First thing , I want to point out here is that AJAX generators take callback methods just like regular element generators. The only Difference is that when we call SHtml generator , it always returns SHtml.any . On the other way , when we call AJAX , it must returns a net.liftweb.http.js.JsCmd. The reason is that the return from the callback is itself a client-side callback that can be used to update the client content.

Let’s have a look at some AJAX generators :

1) ajaxButton :

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