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randrew/gist:769218

Created January 7, 2011 07:08
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gistfile1.lhs
> hiddenFormlet :: (Read a, Show a) => Html -> Maybe a -> SnapForm Html BlazeFormHtml a
> hiddenFormlet err def = inputHidden (show <$> def) `transform` transformRead err
> listCounter :: Maybe Int -> SnapForm Html BlazeFormHtml Int
> listCounter = hiddenFormlet "Couldn't read list counter"
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