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It depends. With AJAX the answer is more in between. Control can be more
centralized in a server-side component or as a mix of client-side and
server-side controllers.
Centralized server-side controller - When having a more centralized
controller the key is to make sure the data in client-side page is in sync with
that of the server. Some applications may keep all the state on the server and
push all updates to client DOM via a simple JavaScript controller.
Client and server-side controllers - This architecture would use
JavaScript to do all presentation related control, event processing, page
manipulation, and rendering of model data on the client. The server-side would
be responsible for things such as business logic and pushing updated model data
to the client. In this case the server would not have intimate knowledge of the
presentation short of the initial page that would be sent to the client page
request. There are some use cases where an entire AJAX application can be
written in a single page. Keep in mind if you choose this type of architecture
that navigation and bookmarking should be considered.
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