These forms contain connected form components. Most of the options can be shared across sections, like the org units or data sets. There is no special form handling here, they are not wrapped with a form element. Actions happen when the onClick callback on the submit button is called.
In the future we could rewrite this to react-final-form, but that's too much work for now as everything is working quite nicely and the form validation is very simple, there no interfield dependencies.
As these forms are more complex, we've introduced react-final-form for form handling. In order to have unified styling across forms, there are some helper components in the form components directory.
Components for individual inputs (like input, select, checkbox, etc) must be
implemented without react-final-form's Field component but must be compatible
with react-final-form in a way that you can pass the input component to Field's
render prop (See existing input components for working configuration).
Components that render multiple input fields while each input needs a separate
Field wrapper can make use of the Field component, but need to provide
the report app's custom input component to ensure uniform style across the app.