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What are the Ajax components in visualforce?

What are the ajax components in visualforce?

Sujan Kumar ReddySujan Kumar Reddy

AJAX Components are used to dynamically replace the content of a panel tag within a page without replacing the page in the browser window. These tags allow a more seamless, flicker-free user interface. User interactions with a page no longer need to submit/request entire pages, instead, pieces of the page can change as data is entered.
There are few AJAX components in Salesforce, which supports AJAX functionality. They are
Action Function, Action Poller, Action Region,Action Status, Action Support
For the detailed scope of each component please refer this PDF http://www.salesforce.com/us/developer/docs/ajax/apex_ajax.pdf