Safe Haskell | None |
---|---|

Language | Haskell98 |

- newFormIdent :: Monad m => MForm m Text
- askParams :: Monad m => MForm m (Maybe Env)
- askFiles :: Monad m => MForm m (Maybe FileEnv)
- formToAForm :: (HandlerSite m ~ site, Monad m) => MForm m (FormResult a, [FieldView site]) -> AForm m a
- aFormToForm :: (Monad m, HandlerSite m ~ site) => AForm m a -> MForm m (FormResult a, [FieldView site] -> [FieldView site])
- mreq :: (RenderMessage site FormMessage, HandlerSite m ~ site, MonadHandler m) => Field m a -> FieldSettings site -> Maybe a -> MForm m (FormResult a, FieldView site)
- mopt :: (site ~ HandlerSite m, MonadHandler m) => Field m a -> FieldSettings site -> Maybe (Maybe a) -> MForm m (FormResult (Maybe a), FieldView site)
- areq :: (RenderMessage site FormMessage, HandlerSite m ~ site, MonadHandler m) => Field m a -> FieldSettings site -> Maybe a -> AForm m a
- aopt :: MonadHandler m => Field m a -> FieldSettings (HandlerSite m) -> Maybe (Maybe a) -> AForm m (Maybe a)
- runFormPost :: (RenderMessage (HandlerSite m) FormMessage, MonadResource m, MonadHandler m) => (Markup -> MForm m (FormResult a, xml)) -> m ((FormResult a, xml), Enctype)
- runFormPostNoToken :: MonadHandler m => (Markup -> MForm m a) -> m (a, Enctype)
- runFormGet :: MonadHandler m => (Markup -> MForm m a) -> m (a, Enctype)
- generateFormPost :: (RenderMessage (HandlerSite m) FormMessage, MonadHandler m) => (Markup -> MForm m (FormResult a, xml)) -> m (xml, Enctype)
- generateFormGet' :: (RenderMessage (HandlerSite m) FormMessage, MonadHandler m) => (Markup -> MForm m (FormResult a, xml)) -> m (xml, Enctype)
- generateFormGet :: MonadHandler m => (Markup -> MForm m a) -> m (a, Enctype)
- identifyForm :: Monad m => Text -> (Markup -> MForm m (FormResult a, WidgetT (HandlerSite m) IO ())) -> Markup -> MForm m (FormResult a, WidgetT (HandlerSite m) IO ())
- type FormRender m a = AForm m a -> Markup -> MForm m (FormResult a, WidgetT (HandlerSite m) IO ())
- renderTable :: Monad m => FormRender m a
- renderDivs :: Monad m => FormRender m a
- renderDivsNoLabels :: Monad m => FormRender m a
- renderBootstrap :: Monad m => FormRender m a
- renderBootstrap2 :: Monad m => FormRender m a
- check :: (Monad m, RenderMessage (HandlerSite m) msg) => (a -> Either msg a) -> Field m a -> Field m a
- checkBool :: (Monad m, RenderMessage (HandlerSite m) msg) => (a -> Bool) -> msg -> Field m a -> Field m a
- checkM :: (Monad m, RenderMessage (HandlerSite m) msg) => (a -> m (Either msg a)) -> Field m a -> Field m a
- checkMMap :: (Monad m, RenderMessage (HandlerSite m) msg) => (a -> m (Either msg b)) -> (b -> a) -> Field m a -> Field m b
- customErrorMessage :: Monad m => SomeMessage (HandlerSite m) -> Field m a -> Field m a
- fieldSettingsLabel :: RenderMessage site msg => msg -> FieldSettings site
- parseHelper :: (Monad m, RenderMessage site FormMessage) => (Text -> Either FormMessage a) -> [Text] -> [FileInfo] -> m (Either (SomeMessage site) (Maybe a))
- parseHelperGen :: (Monad m, RenderMessage site msg) => (Text -> Either msg a) -> [Text] -> [FileInfo] -> m (Either (SomeMessage site) (Maybe a))
- convertField :: Functor m => (a -> b) -> (b -> a) -> Field m a -> Field m b

# Running in MForm monad

newFormIdent :: Monad m => MForm m Text Source

Get a unique identifier.

# Applicative/Monadic conversion

formToAForm :: (HandlerSite m ~ site, Monad m) => MForm m (FormResult a, [FieldView site]) -> AForm m a Source

aFormToForm :: (Monad m, HandlerSite m ~ site) => AForm m a -> MForm m (FormResult a, [FieldView site] -> [FieldView site]) Source

# Fields to Forms

:: (RenderMessage site FormMessage, HandlerSite m ~ site, MonadHandler m) | |

=> Field m a | form field |

-> FieldSettings site | settings for this field |

-> Maybe a | optional default value |

-> MForm m (FormResult a, FieldView site) |

Converts a form field into monadic form. This field requires a value
and will return `FormFailure`

if left empty.

mopt :: (site ~ HandlerSite m, MonadHandler m) => Field m a -> FieldSettings site -> Maybe (Maybe a) -> MForm m (FormResult (Maybe a), FieldView site) Source

areq :: (RenderMessage site FormMessage, HandlerSite m ~ site, MonadHandler m) => Field m a -> FieldSettings site -> Maybe a -> AForm m a Source

Applicative equivalent of `mreq`

.

aopt :: MonadHandler m => Field m a -> FieldSettings (HandlerSite m) -> Maybe (Maybe a) -> AForm m (Maybe a) Source

Applicative equivalent of `mopt`

.

# Run a form

runFormPost :: (RenderMessage (HandlerSite m) FormMessage, MonadResource m, MonadHandler m) => (Markup -> MForm m (FormResult a, xml)) -> m ((FormResult a, xml), Enctype) Source

This function is used to both initially render a form and to later extract
results from it. Note that, due to CSRF protection and a few other issues,
forms submitted via GET and POST are slightly different. As such, be sure to
call the relevant function based on how the form will be submitted, *not*
the current request method.

For example, a common case is displaying a form on a GET request and having
the form submit to a POST page. In such a case, both the GET and POST
handlers should use `runFormPost`

.

runFormPostNoToken :: MonadHandler m => (Markup -> MForm m a) -> m (a, Enctype) Source

runFormGet :: MonadHandler m => (Markup -> MForm m a) -> m (a, Enctype) Source

# Generate a blank form

generateFormPost :: (RenderMessage (HandlerSite m) FormMessage, MonadHandler m) => (Markup -> MForm m (FormResult a, xml)) -> m (xml, Enctype) Source

Similar to `runFormPost`

, except it always ignores the currently available
environment. This is necessary in cases like a wizard UI, where a single
page will both receive and incoming form and produce a new, blank form. For
general usage, you can stick with `runFormPost`

.

generateFormGet' :: (RenderMessage (HandlerSite m) FormMessage, MonadHandler m) => (Markup -> MForm m (FormResult a, xml)) -> m (xml, Enctype) Source

Since 1.3.11

generateFormGet :: MonadHandler m => (Markup -> MForm m a) -> m (a, Enctype) Source

Deprecated: Will require RenderMessage in next version of Yesod

# More than one form on a handler

:: Monad m | |

=> Text | Form identification string. |

-> (Markup -> MForm m (FormResult a, WidgetT (HandlerSite m) IO ())) | |

-> Markup -> MForm m (FormResult a, WidgetT (HandlerSite m) IO ()) |

Creates a hidden field on the form that identifies it. This
identification is then used to distinguish between *missing*
and *wrong* form data when a single handler contains more than
one form.

For instance, if you have the following code on your handler:

((fooRes, fooWidget), fooEnctype) <- runFormPost fooForm ((barRes, barWidget), barEnctype) <- runFormPost barForm

Then replace it with

((fooRes, fooWidget), fooEnctype) <- runFormPost $ identifyForm "foo" fooForm ((barRes, barWidget), barEnctype) <- runFormPost $ identifyForm "bar" barForm

Note that it's your responsibility to ensure that the identification strings are unique (using the same one twice on a single handler will not generate any errors). This allows you to create a variable number of forms and still have them work even if their number or order change between the HTML generation and the form submission.

# Rendering

type FormRender m a = AForm m a -> Markup -> MForm m (FormResult a, WidgetT (HandlerSite m) IO ()) Source

renderTable :: Monad m => FormRender m a Source

Render a form into a series of tr tags. Note that, in order to allow
you to add extra rows to the table, this function does *not* wrap up
the resulting HTML in a table tag; you must do that yourself.

renderDivs :: Monad m => FormRender m a Source

render a field inside a div

renderDivsNoLabels :: Monad m => FormRender m a Source

render a field inside a div, not displaying any label

renderBootstrap :: Monad m => FormRender m a Source

Deprecated: Please use the Yesod.Form.Bootstrap3 module.

Deprecated synonym for `renderBootstrap2`

.

renderBootstrap2 :: Monad m => FormRender m a Source

Render a form using Bootstrap v2-friendly shamlet syntax. If you're using Bootstrap v3, then you should use the functions from module Yesod.Form.Bootstrap3.

Sample Hamlet:

<form .form-horizontal method=post action=@{ActionR} enctype=#{formEnctype}> <fieldset> <legend>_{MsgLegend} $case result $of FormFailure reasons $forall reason <- reasons <div .alert .alert-error>#{reason} $of _ ^{formWidget} <div .form-actions> <input .btn .primary type=submit value=_{MsgSubmit}>

Since 1.3.14

# Validation

check :: (Monad m, RenderMessage (HandlerSite m) msg) => (a -> Either msg a) -> Field m a -> Field m a Source

checkBool :: (Monad m, RenderMessage (HandlerSite m) msg) => (a -> Bool) -> msg -> Field m a -> Field m a Source

Return the given error message if the predicate is false.

checkM :: (Monad m, RenderMessage (HandlerSite m) msg) => (a -> m (Either msg a)) -> Field m a -> Field m a Source

checkMMap :: (Monad m, RenderMessage (HandlerSite m) msg) => (a -> m (Either msg b)) -> (b -> a) -> Field m a -> Field m b Source

Same as `checkM`

, but modifies the datatype.

In order to make this work, you must provide a function to convert back from the new datatype to the old one (the second argument to this function).

Since 1.1.2

customErrorMessage :: Monad m => SomeMessage (HandlerSite m) -> Field m a -> Field m a Source

Allows you to overwrite the error message on parse error.

# Utilities

fieldSettingsLabel :: RenderMessage site msg => msg -> FieldSettings site Source

Generate a `FieldSettings`

from the given label.

parseHelper :: (Monad m, RenderMessage site FormMessage) => (Text -> Either FormMessage a) -> [Text] -> [FileInfo] -> m (Either (SomeMessage site) (Maybe a)) Source

A helper function for creating custom fields.

This is intended to help with the common case where a single input value is required, such as when parsing a text field.

Since 1.1

parseHelperGen :: (Monad m, RenderMessage site msg) => (Text -> Either msg a) -> [Text] -> [FileInfo] -> m (Either (SomeMessage site) (Maybe a)) Source

A generalized version of `parseHelper`

, allowing any type for the message
indicating a bad parse.

Since 1.3.6

convertField :: Functor m => (a -> b) -> (b -> a) -> Field m a -> Field m b Source

Since a `Field`

cannot be a `Functor`

, it is not obvious how to "reuse" a Field
on a `newtype`

or otherwise equivalent type. This function allows you to convert
a `Field m a`

to a `Field m b`

assuming you provide a bidireccional
convertion among the two, through the first two functions.

A simple example:

import Data.Monoid sumField :: (Functor m, Monad m, RenderMessage (HandlerSite m) FormMessage) => Field m (Sum Int) sumField = convertField Sum getSum intField

Another example, not using a newtype, but instead creating a Lazy Text field:

import qualified Data.Text.Lazy as TL TextField :: (Functor m, Monad m, RenderMessage (HandlerSite m) FormMessage) => Field m TL.Text lazyTextField = convertField TL.fromStrict TL.toStrict textField

Since 1.3.16