Question posted in 
I need Help to add BootStrap to My YesodForm Project. Can you help me, guys ?
Thats my code. I just want add BootStrap styles to add to my html components
I already read aloot tutorials but are complexive, i am new at Haskell. I Need a simples thing just to that simple project. Thank.s
{-# LANGUAGE OverloadedStrings, TypeFamilies, QuasiQuotes,
TemplateHaskell, GADTs, FlexibleInstances,
MultiParamTypeClasses, DeriveDataTypeable,
GeneralizedNewtypeDeriving, ViewPatterns, EmptyDataDecls #-}
import Yesod
import Database.Persist.Postgresql
import Data.Text
import Text.Lucius
import Control.Monad.Logger (runStdoutLoggingT)
data Pagina = Pagina{connPool :: ConnectionPool}
share [mkPersist sqlSettings, mkMigrate "migrateAll"] [persistLowerCase|
Animals json
nome Text
idade Int
deriving Show
Users json
nome Text
login Text
senha Text
deriving Show
|]
mkYesod "Pagina" [parseRoutes|
/ HomeR GET
/animal/cadastro AnimalR GET POST
/animal/checar/#AnimalsId ChecarAnimalR GET
/erro ErroR GET
/login LoginR GET POST
/usuario UsuarioR GET POST
/perfil/#UsersId PerfilR GET
/admin AdminR GET
/logout LogoutR GET
|]
instance Yesod Pagina where
authRoute _ = Just LoginR
isAuthorized LoginR _ = return Authorized
isAuthorized ErroR _ = return Authorized
isAuthorized HomeR _ = return Authorized
isAuthorized UsuarioR _ = return Authorized
isAuthorized AdminR _ = isAdmin
isAuthorized _ _ = isUser
isUser = do
mu <- lookupSession "_ID"
return $ case mu of
Nothing -> AuthenticationRequired
Just _ -> Authorized
isAdmin = do
mu <- lookupSession "_ID"
return $ case mu of
Nothing -> AuthenticationRequired
Just "admin" -> Authorized
Just _ -> Unauthorized "Acesso Restrito para Administrador"
instance YesodPersist Pagina where
type YesodPersistBackend Pagina = SqlBackend
runDB f = do
master <- getYesod
let pool = connPool master
runSqlPool f pool
type Form a = Html -> MForm Handler (FormResult a, Widget)
instance RenderMessage Pagina FormMessage where
renderMessage _ _ = defaultFormMessage
------------------------
formAnimal :: Form Animals
formAnimal = renderDivs $ Animals <$>
areq textField "Nome: " Nothing <*>
areq intField "Idade: " Nothing
formUser :: Form Users
formUser = renderDivs $ Users <$>
areq textField "Nome: " Nothing <*>
areq textField "Login: " Nothing <*>
areq passwordField "Password: " Nothing
formLogin :: Form (Text,Text)
formLogin = renderDivs $ (,) <$>
areq textField "Login: " Nothing <*>
areq passwordField "Senha: " Nothing
getAnimalR :: Handler Html
getAnimalR = do
(widget, enctype) <- generateFormPost formAnimal
defaultLayout $ do
toWidget [cassius|
label
color:blue;
|]
[whamlet|
<form .form-horizontal method=post enctype=#{enctype} action=@{AnimalR}>
^{widget}
<input type="submit" value="Cadastrar Animal">
|]
getPerfilR :: UsersId -> Handler Html
getPerfilR uid = do
user <- runDB $ get404 uid
defaultLayout $ do
toWidget $ $(luciusFile "templates/perfil.lucius")
$(whamletFile "templates/perfil.hamlet")
getUsuarioR :: Handler Html
getUsuarioR = do
(widget, enctype) <- generateFormPost formUser
defaultLayout [whamlet|
<form method=post enctype=#{enctype} action=@{UsuarioR}>
^{widget}
<input type="submit" value="Enviar">
|]
postAnimalR :: Handler Html
postAnimalR = do
((result, _), _) <- runFormPost formAnimal
case result of
FormSuccess anim -> (runDB $ insert anim) >>= piid -> redirect (ChecarAnimalR piid)
_ -> redirect ErroR
postUsuarioR :: Handler Html
postUsuarioR = do
((result, _), _) <- runFormPost formUser
case result of
FormSuccess user -> (runDB $ insert user) >>= piid -> redirect (PerfilR piid)
_ -> redirect ErroR
getHomeR :: Handler Html
getHomeR = defaultLayout [whamlet|Hello World!|]
addStyle :: Widget
addStyle = addStylesheetRemote "http://netdna.bootstrapcdn.com/twitter-bootstrap/2.1.0/css/bootstrap-combined.min.css"
getAdminR :: Handler Html
getAdminR = defaultLayout [whamlet|
<b><h1><font size="11"> Bem vindo ao Painel Administrativo</font></h1></b>
|]
getLoginR :: Handler Html
getLoginR = do
(widget, enctype) <- generateFormPost formLogin
defaultLayout [whamlet|
<form method=post enctype=#{enctype} action=@{LoginR}>
^{widget}
<input type="submit" value="Login">
|]
postLoginR :: Handler Html
postLoginR = do
((result, _), _) <- runFormPost formLogin
case result of
FormSuccess ("admin","eitapleuga") -> setSession "_ID" "admin" >> redirect AdminR
FormSuccess (login,senha) -> do
user <- runDB $ selectFirst [UsersLogin ==. login, UsersSenha ==. senha] []
case user of
Nothing -> redirect LoginR
Just (Entity pid u) -> setSession "_ID" (pack $ show $ fromSqlKey pid) >> redirect (PerfilR pid)
getChecarAnimalR :: AnimalsId -> Handler Html
getChecarAnimalR pid = do
animal <- runDB $ get404 pid
defaultLayout [whamlet|
<font size="10">Perfil do Pet</font><br>
<p><b> Nome do Pet:</b> #{animalsNome animal}
<p><b> Idade do Pet:</b> #{show $ animalsIdade animal} Anos
|]
getErroR :: Handler Html
getErroR = defaultLayout [whamlet|
<h1>Falha no Cadastro !</h1>
|]
getLogoutR :: Handler Html
getLogoutR = do
deleteSession "_ID"
defaultLayout [whamlet|
<h1> <b>Logout</b> efetuado com sucesso! </h1>
|]
connStr = "dbname=d4673as0stmsm7 host=ec2-54-221-225-242.compute-1.amazonaws.com user=nzjfptmglfomng password=fyYms4A9T8gkP4_Go8GswcfIiE port=5432"
main::IO()
main = runStdoutLoggingT $ withPostgresqlPool connStr 10 $ pool -> liftIO $ do
runSqlPersistMPool (runMigration migrateAll) pool
warp 8080 (Pagina pool)
2
Answers
You can add it in your
Handlerfunction like this:Also if you are new to Haskell, I would suggest you to learn some minimal Haskell before diving into Yesod.
Especially for a first project I would advise to use the scaffolded site. You can get it by following the quick start guide on the Yesod home page. Not only do you get sensible default settings, but it also has the bootstrap css already integrated.
The downside is of course that the scaffolding throws a lot of stuff and opinions at you that you might not want or not agree with. But even if you don’t like the scaffolding, you can always keep one in a separate folder and just take inspiration from it and incorporate parts of it into your own site – like the integration of bootstrap or jquery.
What you need to do next is to add the appropriate classes to your html elements. There are two ways to do that, depending on the context. In your own widgets you just add them like you would any other class (with a point in front of it). If you use code that is generated, for example for forms or for yesod-table, you often have a choice between different rendering functions. For example you can render forms in two columns by using the renderTable rendering function. But there is almost always another function with a name like renderBootstrap which will render the content as plain divs with bootstrap classes.
So all in all Yesod is extremely well integrated with bootstrap. Even too much in my personal opinion. But in your case it should make your task comparatively easy after the initial setup confusion.