What is viewState?
ViewState holds state of the visualforce
page that holds state that includes the fields, components and
controller state. Viewstate data in encrypted and cannot be viewed tools
like firebug.
To maintain state in a Visualforce page,
the Force.com platform includes the state of components, field values,
and controller state in a hidden form element. This encrypted string is
referred to as the view state and has a limit of 135KB.
The data in the viewstate should be
sufficient to recreate the state of the visualforce page when the
postback is received. To do this, viewstate stores:
- Stores Non transient data members in the associated controller (standard\custom) and controller extensions.
- Stores Objects that are reachable from a non-transient data member in a controller or extension.
- Stores the component tree for that
page, that tree represents the visualforce page’s component structure
and the associated state, which are the values applied to those
components.
- view state stores small amount of data.
How to see view state:
You can see view state when developer mode is enabled. See below screen.
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