FormPanel

FormPanel subclasses ContentPanel and provides features for managing form components. By default, it uses a layout called FormLayout. The only types of component that we can add to a FormLayout are Field components such as TextField and LabelField. If we try to add any other component, it will be ignored and not rendered.

The main benefit FormPanel gives is the ability to act on all the fields contained within it. This includes features such as marking all fields as read-only, checking that all fields are valid, changing how labels are displayed, and ultimately submitting the form using HTTP post or GWT RPC.