Hi Raghu,

You may use the following methods.

Pages can be attached to a Java class known as controllers. There are three methods in the controller class:

a) processRequest()fires just before the page is displayed to the user.
b) processFormData()fires when page is submitted to the server. This method transfers the data from page fields into the server cache.
c) processFormRequest() fires after processFormData. In processFormRequest, logic can be written to trap the event such as a button click.

Cheers!
Shanmuga