[Haskell-cafe] Updated formlets sample?

Martin Huschenbett huschi at gmx.org
Mon Sep 22 12:47:52 EDT 2008

Hi Chris,

you're absolutely right. The mistake was in the where-part of withForm. 
The function handleOk' gets an environment d as argument but uses an 
extractor that was created without passing d to runFormState. I've put a 
corrected version on hpaste [1] and also posted it to the wiki on 
haskell.org [2]. Hope this is ok for you?



[1] http://hpaste.org/10568#a1
[2] http://haskell.org/haskellwiki/Formlets

Chris Eidhof schrieb:
> That means that you don't have input0 in your environment, maybe you're 
> passing in an empty environment?
> -chris
> On 21 sep 2008, at 12:11, Martin Huschenbett wrote:
>> Hi Chris,
>> thanks for the updated example. Compiling works now. But when I try to 
>> run it I alway get error messages like
>> ["input0 is not in the data","input1 is not in the data"]
>> Regards,
>> Martin.
>> Chris Eidhof schrieb:
>>> Hey Martin,
>>> On 19 sep 2008, at 04:14, Martin Huschenbett wrote:
>>>> I found a blog post concerning formlets [1] in the web. Since looks 
>>>> very interesting I tried to compile the sample code with recent 
>>>> versions of HAppS and formlets from hackage. But this didn't work as 
>>>> the API of formlets has changed since this post.
>>>> I tried to adopt the code to the new API but I was unable to finish 
>>>> this since there is a new monadic context I don't know to handle in 
>>>> the right way.
>>>> So my question is, is there an updated version of this sample code 
>>>> in the web or has anybody tried to adopt it and can send me the 
>>>> results?
>>> Yes, I'm sorry for that. The API is still very immature and due to 
>>> changes, that's also why it hasn't been officially announced yet. 
>>> I've just put an updated example at http://hpaste.org/10568, hope 
>>> that'll work for you. I guess we should build a small homepage / 
>>> wikipage that always has an up-to-date example.
>>> -chris

More information about the Haskell-Cafe mailing list