problem with radioField from yesod.Forms
I am working from the widget example from the Yesod web site. I was able to display a column of check boxes, and am able to generate a [Bool], which is enough for now, as far as the check boxes go. Now, I would like a column of radioFields. I will worry about the CSS and Ajax stuff later. The problem is that radioField uses a slightly different type. I admit I don't understand some of these types, but I can exploit my pattern recognition skills well enough. Below is my last attempt. The type for radioField is radioField :: (Eq x, IsForm f, FormType f ~ x) => [(x, Text)] -> FormFieldSettings -> Maybe x -> f The type for boolField is boolField :: (IsForm f, FormType f ~ Bool) => FormFieldSettings -> Maybe Bool -> f It's the [(x,Text)] that is tricking me. I suspect the problem may be me not understanding the Applicative style well enough. Could someone offer some feedback to send me on the right track?
handleFormR = do (res, form, enctype, nonce) <- runFormPost $ fieldsToTable $ (,,,,,,,,) <$> boolField "Server One" Nothing <*> boolField "Server Two" Nothing <*> boolField "Server Three" Nothing <*> boolField "Server Four" Nothing <*> boolField "Server Five" Nothing <*> boolField "Server Six" Nothing <*> boolField "Server Seven" Nothing <*> boolField "Server Eight" Nothing <*> radioField [(1, "Test 1"), (2, "Test 2")] "Pick a Test" Nothing
mlitchard@apotheosis:~/playground/yesod-examples-0.8.0.1/src$ runhaskell nwidgets.lhs nwidgets.lhs:46:7: The last statement in a 'do' construct must be an expression: (res, form, enctype, nonce) <- runFormPost $ fieldsToTable $ (,,,,,,,,) <$> boolField "Server One" Nothing <*> boolField "Server Two" Nothing <*> boolField "Server Three" Nothing <*> boolField "Server Four" Nothing <*> boolField "Server Five" Nothing <*> boolField "Server Six" Nothing <*> boolField "Server Seven" Nothing <*> boolField "Server Eight" Nothing <*> radioField [(1, "Test 1"), (2, "Test 2")] "Test 1" Nothing
For future reference, the problem here was an indentation problem
caused by code not shown. It's fine now.
On Mon, Jun 6, 2011 at 4:30 PM, Michael Litchard
I am working from the widget example from the Yesod web site. I was able to display a column of check boxes, and am able to generate a [Bool], which is enough for now, as far as the check boxes go. Now, I would like a column of radioFields. I will worry about the CSS and Ajax stuff later. The problem is that radioField uses a slightly different type. I admit I don't understand some of these types, but I can exploit my pattern recognition skills well enough. Below is my last attempt.
The type for radioField is radioField :: (Eq x, IsForm f, FormType f ~ x) => [(x, Text)] -> FormFieldSettings -> Maybe x -> f
The type for boolField is boolField :: (IsForm f, FormType f ~ Bool) => FormFieldSettings -> Maybe Bool -> f
It's the [(x,Text)] that is tricking me. I suspect the problem may be me not understanding the Applicative style well enough. Could someone offer some feedback to send me on the right track?
handleFormR = do (res, form, enctype, nonce) <- runFormPost $ fieldsToTable $ (,,,,,,,,) <$> boolField "Server One" Nothing <*> boolField "Server Two" Nothing <*> boolField "Server Three" Nothing <*> boolField "Server Four" Nothing <*> boolField "Server Five" Nothing <*> boolField "Server Six" Nothing <*> boolField "Server Seven" Nothing <*> boolField "Server Eight" Nothing <*> radioField [(1, "Test 1"), (2, "Test 2")] "Pick a Test" Nothing
mlitchard@apotheosis:~/playground/yesod-examples-0.8.0.1/src$ runhaskell nwidgets.lhs
nwidgets.lhs:46:7: The last statement in a 'do' construct must be an expression: (res, form, enctype, nonce) <- runFormPost $ fieldsToTable $ (,,,,,,,,) <$> boolField "Server One" Nothing <*> boolField "Server Two" Nothing <*> boolField "Server Three" Nothing <*> boolField "Server Four" Nothing <*> boolField "Server Five" Nothing <*> boolField "Server Six" Nothing <*> boolField "Server Seven" Nothing <*> boolField "Server Eight" Nothing <*> radioField [(1, "Test 1"), (2, "Test 2")] "Test 1" Nothing
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Michael Litchard