Asynchronous Actions
So far, you’ve built Visualforce pages that have a simple interaction with their controller. They display data from the controller, potentially allowing the user to change it, and then submit it using an action component such as a commandButton. The action component invokes a method on the controller that returns a PageReference, navigating the user to a new page or refreshing the current page.
Visualforce actions also support more complex, asynchronous interactions with the page, commonly referred to as Ajax. Ajax is short for Asynchronous JavaScript and XML. Visualforce supports Ajax in two ways:
1. It allows actions to run in the background. The user is free to continue working with the page while Force.com processes ...
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