Jay,
many thanks for the answer, that already helps a lot!
Just one thing - the generated html does not have a "value" attribute, but
instead uses a different "name" for every radio button - how can I get the
radio buttons identified as a group by the browser, such that only one button
can be selected?
In fact, looking at the generated html as well as the input given to
formlet-process, I do not see where the "value" passed to the radio constructor
is used?
Thanks again,
Sigrid
Am 26.12.2011 um 22:28 schrieb Jay McCarthy:
> Here is a short example:
>
> #lang racket
> (require racket/promise
> web-server/http/request-structs
> web-server/formlets
> net/url)
>
> (define some-formlet
> (formlet
> (div "Checked Radio"
> ,{(default #"default" (radio #"checked-radio" #t)) . => . cr}
> "Not-Checked Radio"
> ,{(default #"default" (radio #"unchecked-radio" #f)) . => . ncr}
> "Checked Checkbox"
> ,{(default #"default" (checkbox #"checked-checkbox" #t)) . => . cc}
> "Not-Checked Checkbox"
> ,{(default #"default" (checkbox #"uncheck-checkbox" #f)) . => . ncc})
> (list cr ncr cc ncc)))
>
> (formlet-display some-formlet)
>
> (define (show-example bs)
> (formlet-process some-formlet
> (request #"GET"
> (string->url "http://localhost";)
> empty
> (delay bs)
> #f
> "host"
> 8943
> "client")))
>
> (show-example empty)
> (show-example (list (binding:form #"input_0" #"true")))
> (show-example (list (binding:form #"input_0" #"true")
> (binding:form #"input_1" #"false")))
> (show-example (list (binding:form #"input_0" #"true")
> (binding:form #"input_1" #"false")
> (binding:form #"input_2" #"true")
> (binding:form #"input_3" #"false")))
>
> It would be good to create a higher-level formlet that rendered to a
> checkbox or radio button that would return a boolean or a selection,
> like the select formlets do.
>
> Jay
>
> On Mon, Dec 26, 2011 at 12:02 PM, keyd...@gmx.de <keyd...@gmx.de> wrote:
>> Hi,
>>
>> it's me again, and whereas I don't know how dumb I am I sure might have been
>> a bit lazy :-;
>>
>> Unfortunately, even after taking a bit more time, I don't know how it works.
>> Lastly, I've been trying this, which displayed fine:
>>
>> (define f-choose-db
>> (let ((o (radio #"orcl" #t))
>> (r (radio #"rndba" #f)))
>> (formlet
>> (div "orcl" ,(o . => . orcl)
>> "rndba" ,(r . => . rndba))
>> (values orcl rndba))))
>>
>> But when I use formlet-process to extract the result (just clicking submit,
>> leaving the checked box checked), I get the values #<binding:form> and #f...
>> (and see input_0=on in the browser).
>>
>> Also I was trying to add a binding name to the radio function calls
>> themselves, e.g. (radio #"xx" #f . => . myname), but this throws a syntax
>> error.
>>
>> Could anyone offer a hint what I'm doing wrong here?
>>
>> (BTW this list has the most helpful people & inspiring content of all
>> mailing lists I know of , and I'm not writing this in order to get a nice
>> answer :-) )
>>
>> Ciao
>> Sigrid
>>
>>
>> ____________________
>> Racket Users list:
>> http://lists.racket-lang.org/users
>
>
>
> --
> Jay McCarthy <j...@cs.byu.edu>
> Assistant Professor / Brigham Young University
> http://faculty.cs.byu.edu/~jay
>
> "The glory of God is Intelligence" - D&C 93
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