What is viewstate in JSF, and how is it used?
- by MatthieuF
In JSF, there is a viewstate associated with each page, which is passed back and forth with submits etc.
I know that viewstate is calculated using the states of the various controls on the page, and that you can store it either client side or server side.
The question is: how is this value used? Is it used to validate the values sent at submit, to ensure that the same request is not sent twice?
Also, how is it calculated - I realise that richfaces may be calculated differently from myfaces, but an idea would be nice.
Thanks.