I'm on mobile now, but you want to use the ^?{} syntax which allows you to pass a pair of route and query string parameters. There's an example in the Shakespeare chapter of the book. On Sat, May 27, 2017, 8:34 AM Michael Litchard wrote:

Below I have an example from the Yesod https://www.yesodweb.com/book/forms book. The form action maps to a route. How do I pass a value to that route. I know it has something to do with ^ but I can't see to make it work right.

{-# LANGUAGE MultiParamTypeClasses #-}{-# LANGUAGE OverloadedStrings #-}{-# LANGUAGE QuasiQuotes #-}{-# LANGUAGE TemplateHaskell #-}{-# LANGUAGE TypeFamilies #-}import Control.Applicativeimport Data.Text (Text)import Yesod data App = App

mkYesod "App" [parseRoutes|/ HomeR GET/input InputR GET|]

instance Yesod App

instance RenderMessage App FormMessage where renderMessage _ _ = defaultFormMessage data Person = Person { personName :: Text , personAge :: Int } deriving Show

getHomeR :: Handler Html getHomeR = defaultLayout [whamlet| <form action=@{InputR}> <--- problem line -- want to do this

<p> My name is <input type=text name=name> and I am <input type=text name=age> years old. <input type=submit value="Introduce myself"> |]

getInputR :: Text -> Handler Html getInputR label = do person <- runInputGet $ Person <$> ireq textField label <*> ireq intField "age" defaultLayout [whamlet|<p>#{show person}|]

main :: IO () main = warp 3000 App

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