Yesod.Form.Input

Provides for getting input from either GET or POST params without generating HTML forms. For more information, see: http://www.yesodweb.com/book/forms#forms_kinds_of_forms.

Documentation

newtype FormInput m a

Type for a form which parses a value of type a with the base monad m (usually your Handler). Can compose this using its Applicative instance.

Constructors

FormInput

Fields

• unFormInput :: HandlerSite m -> [Text] -> Env -> FileEnv -> m (Either DText a)

Instances

Monad m => Applicative (FormInput m)

Defined in Yesod.Form.Input

Methods

pure :: a -> FormInput m a

(<*>) :: FormInput m (a -> b) -> FormInput m a -> FormInput m b

liftA2 :: (a -> b -> c) -> FormInput m a -> FormInput m b -> FormInput m c

(*>) :: FormInput m a -> FormInput m b -> FormInput m b

(<*) :: FormInput m a -> FormInput m b -> FormInput m a

Monad m => Functor (FormInput m)

Defined in Yesod.Form.Input

Methods

fmap :: (a -> b) -> FormInput m a -> FormInput m b

(<$) :: a -> FormInput m b -> FormInput m a

runInputGet :: MonadHandler m => FormInput m a -> m a

Run a FormInput on the GET parameters (i.e., query string). If parsing fails, calls invalidArgs.

runInputGetResult :: MonadHandler m => FormInput m a -> m (FormResult a)

Run a FormInput on the GET parameters (i.e., query string). Does not throw exceptions on failure.

Since 1.4.1

runInputPost :: MonadHandler m => FormInput m a -> m a

Run a FormInput on the POST parameters (i.e., request body). If parsing fails, calls invalidArgs.

runInputPostResult :: MonadHandler m => FormInput m a -> m (FormResult a)

Run a FormInput on the POST parameters (i.e., request body). Does not throw exceptions on failure.

ireq

Arguments

:: (Monad m, RenderMessage (HandlerSite m) FormMessage)

=> Field m a

-> Text

name of the field

-> FormInput m a

Promote a Field into a FormInput, requiring that the value be present and valid.

iopt :: Monad m => Field m a -> Text -> FormInput m (Maybe a)

Promote a Field into a FormInput, with its presence being optional. If the value is present but does not parse correctly, the form will still fail.