Hi again,
I just realized that I never figured out how to get radio-groups not to
raise an error when no option is selected. I manage to put defaults for
input-string and so on, by doing what Jay suggested and redefining my own
through the use of 'default and 'input.
In the case of radio-group, what I want is to have a default (or #f) value
when no value has been picked and resend the form for the user to complete
it. Since there is some magic going on with formlet-process of radio-group
that I do not understand, I couldn't figure out where to hack it to make it
accept no values (it blows up trying to call 'first on a list that contains
no values).
As I mentioned earlier, I can hack this by adding a hidden radio button
which I check by default, but that is a suboptimal solution.
I'm happy to try and implement something reuseable for other people, if I
can be pointed at the right part of the code. I followed the code from
formlet-process to request-bindings/raw to request-bindings/raw promise,
which apparently is defined (somehow) via
(define-serializable-struct
request
(method uri headers/raw bindings/raw-promise post-data/raw
host-ip host-port client-ip)
#:transparent)
I looked at the defining file of define-serializable-struct and gave up.
Thanks,
Marc
On Mon, Jan 25, 2016 at 2:54 PM, Marc Kaufmann <marc.kaufman...@gmail.com>
wrote:
> Done, although since it is my first pull request, let me know if I did it
> wrong (tried first without forking, which of course was nonsense).
>
> I tried to find a way to have the 'id' on radio the same as the 'for' on
> label, but I couldn't figure out well enough what is going on.
>
> Cheers,
> Marc
>
> On Mon, Jan 18, 2016 at 10:50 AM, Jay McCarthy <jay.mccar...@gmail.com>
> wrote:
>
>> Great Marc.
>>
>> If you want, you could submit a pull-request and we could add the wrap
>> thing to the main library.
>>
>> Jay
>>
>> On Wed, Jan 13, 2016 at 5:00 PM, Marc Kaufmann
>> <marc.kaufman...@gmail.com> wrote:
>> > So, turns out I can answer my own question, if ugly hacks count.
>> >
>> > I copy-pasted (yep, DRY is my guiding principle: Do Repeat Yourself) the
>> > code for radio-group and the functions it depends on and changed the
>> part of
>> > the code that creates the HTML in 'input-group' from
>> >
>> > (for/list ([vn (in-range i)])
>> > (define e (hash-ref value->element vn))
>> > (define v (number->string vn))
>> > (list
>> > `(input ([name ,name]
>> > [type ,kind]
>> > [value ,v]
>> > ,@(if (checked? e)
>> > '([checked "true"])
>> > empty)
>> > ,@(attrs e)))
>> > (display e))))))))
>> >
>> > to
>> >
>> > (for/list ([vn (in-range i)])
>> > (define e (hash-ref value->element vn))
>> > (define v (number->string vn))
>> > (wrap e (string-append name "-" v)
>> > `(input ([name ,name]
>> > [type ,kind]
>> > [value ,v]
>> > ,@(if (checked? e)
>> > '([checked "true"])
>> > empty)
>> > ,@(attrs e))))))))))
>> >
>> >
>> > The string-append is hard-coding for the id I want to put on the label
>> and
>> > input (which I am failing to get done right now). It now works when I
>> use
>> > the following definition of radio-group/bootstrap:
>> >
>> > (define (wrap/bootstrap e id input)
>> > (list
>> > `(div ((class "form-group"))
>> > (label ((for ,id))
>> > ,input
>> > ,e))))
>> >
>> > (define (radio-group/bootstrap l
>> > #:attributes [attrs (λ (x) empty)]
>> > #:checked? [checked? (λ (x) #f)])
>> > (input-group/wrap l
>> > #:kind "radio"
>> > #:attributes attrs
>> > #:checked? checked?
>> > #:wrap wrap/bootstrap))
>> >
>> >
>> > It is not particularly pretty, I do not understand the code in
>> input-group,
>> > and I seem to be incapable of figuring out whether to return (list 'div
>> ...)
>> > or (list '(div ...)) (or whether to include it via ,(function-call
>> ...) or
>> > ,@(function-call ...)), but it works for me now (modulo a missing 'id'
>> > attribute on <input>, but I will hack that on the client side via
>> jQuery).
>> >
>> > Anyway, while any improvements to my (already aesthetic) solution are
>> > appreciated, I am good for what I need right now.
>> >
>> > Cheers,
>> > Marc
>> >
>> > On Wed, Jan 13, 2016 at 12:26 PM, Marc Kaufmann <
>> marc.kaufman...@gmail.com>
>> > wrote:
>> >>
>> >> Thanks Jay.
>> >>
>> >> On Mon, Jan 11, 2016 at 11:15 AM, Jay McCarthy <jay.mccar...@gmail.com
>> >
>> >> wrote:
>> >>>
>> >>> Hi Marc,
>> >>>
>> >>> Most formlets are typed as `(formlet/c (or/c false/c binding?))` where
>> >>> the `binding?` is returned when the thing is there and the `#f` is
>> >>> returned when it isn't. However, if you use `required`, then an
>> >>> exception is thrown on the `#f` because the form element must be
>> >>> present. Formlets like `input-string` include a call to `required`. I
>> >>> think that you either want to handle the `#f` or use `default` to have
>> >>> a default value present. Similarly most formlets like `text-input`
>> >>> have an optional `#:value` keyword for starting them off with a value.
>> >>>
>> >>
>> >> Since I use radio-group, is there a way to make it not blow up if it
>> >> doesn't get a value on any button, it seems that it works differently
>> from
>> >> the text inputs. Of course, I could hack this by adding a hidden
>> button and
>> >> marking it as checked, but that's a bit of a hack (not that I am
>> opposed to
>> >> hacks).
>> >>
>> >>>
>> >>> I think a better form DSL could be built out of formlets that
>> >>> automatically did client & server-side checking with looping
>> >>> re-submission until correct, etc. But that's not what formlets are yet
>> >>> and you have to roll it yourself.
>> >>>
>> >>> Jay
>> >>>
>> >>
>> >> I thought so.
>> >>
>> >> A related question on radio-groups though: #:display allows me to add
>> some
>> >> custom HTML per radio input, but only after the radio input tag. Is
>> there a
>> >> way to wrap each radio input in a div? I ask because I am using
>> Bootstrap
>> >> for styling, which requires the following HTML:
>> >>
>> >> <div class="radio">
>> >> <label>
>> >> <input type="radio" name="optionsRadios" id="optionsRadios1"
>> >> value="option1">
>> >> Option one is this.
>> >> </label>
>> >> </div>
>> >>
>> >> Is this something that would be easy to add to (some version of)
>> >> radio-group? I am using this in several places (different radio
>> groups), so
>> >> I would really like to leverage the formlet-process and
>> formlets-display
>> >> abstraction, but I don't see how I would build a custom
>> radio-group/wrap
>> >> that takes advantage of formlets by picking only the checked radio,
>> gives
>> >> them all the same name, yet allows me to wrap it all.
>> >>
>> >> Thanks for all the replies, hopefully at some point I actually
>> understand
>> >> what I am doing and can answer questions.
>> >>
>> >> Marc
>> >>
>> >>>
>> >>>
>> >>> On Sun, Jan 10, 2016 at 9:05 PM, Marc Kaufmann
>> >>> <marc.kaufman...@gmail.com> wrote:
>> >>> > Thanks.
>> >>> >
>> >>> > Another question about formlets: when I use (formlet-process
>> >>> > formlet-name)
>> >>> > it will often raise errors when a field doesn't have a value. Is
>> there
>> >>> > an
>> >>> > easy way of capturing errors, in particular to show the form as it
>> was
>> >>> > entered by the user, but with an error message at the top, rather
>> than
>> >>> > blowing up?
>> >>> >
>> >>> > One way I can imagine doing this is to catch the errors via
>> >>> > (with-handlers
>> >>> > ... ), and then resend the form with previous answers pre-populated.
>> >>> > So, I
>> >>> > would do the following, where 'answer' is the string ("Yes" or "No")
>> >>> > that
>> >>> > was associated with the checked answer previously.
>> >>> >
>> >>> > (define (rg-formlet answer)
>> >>> > (define (was-answer? a)
>> >>> > (equal? a answer))
>> >>> > (formlet
>> >>> > (label
>> >>> > ,{(radio-group '("Yes" "No") #:checked was-answer?) . => .
>> >>> > answer})
>> >>> > answer))
>> >>> >
>> >>> > Is this the way to do it, or is there an easier way (since forms
>> with
>> >>> > missing elements can't be such a rarity - and yes, I'll do checking
>> on
>> >>> > the
>> >>> > client-side as well).
>> >>> >
>> >>> > Thanks,
>> >>> > Marc
>> >>> >
>> >>> > On Sun, Jan 10, 2016 at 5:08 PM, Jay McCarthy <
>> jay.mccar...@gmail.com>
>> >>> > wrote:
>> >>> >>
>> >>> >> On Sun, Jan 10, 2016 at 3:50 PM, Marc Kaufmann
>> >>> >> <marc.kaufman...@gmail.com> wrote:
>> >>> >> > Hi,
>> >>> >> >
>> >>> >> > I manage to get the basic formlets to work, and tried the
>> >>> >> > radiogroup,
>> >>> >> > but it
>> >>> >> > fails with the following error: "input-group: invalid selection
>> #f",
>> >>> >> > even
>> >>> >> > though I had it selected. After some playing around, I saw that
>> >>> >> > there
>> >>> >> > are
>> >>> >> > two input_0 fields being sent on submit, since I have another
>> >>> >> > formlet on
>> >>> >> > the
>> >>> >> > same page (with a separate formlet-display and formlet-process).
>> >>> >> >
>> >>> >> > My question is: If I use formlets, do I have to put all the
>> formlets
>> >>> >> > into
>> >>> >> > one big formlet on every page, as otherwise fields will have the
>> >>> >> > same
>> >>> >> > name
>> >>> >> > attribute, and there will be clashes?
>> >>> >>
>> >>> >> Each form can have only one formlet. There can be different forms
>> on a
>> >>> >> page, I believe.
>> >>> >>
>> >>> >> Jay
>> >>> >>
>> >>> >> > Thanks,
>> >>> >> > Marc
>> >>> >> >
>> >>> >> >
>> >>> >> > --
>> >>> >> > You received this message because you are subscribed to the
>> Google
>> >>> >> > Groups
>> >>> >> > "Racket Users" group.
>> >>> >> > To unsubscribe from this group and stop receiving emails from it,
>> >>> >> > send
>> >>> >> > an
>> >>> >> > email to racket-users+unsubscr...@googlegroups.com.
>> >>> >> > For more options, visit https://groups.google.com/d/optout.
>> >>> >>
>> >>> >>
>> >>> >>
>> >>> >> --
>> >>> >> Jay McCarthy
>> >>> >> Associate Professor
>> >>> >> PLT @ CS @ UMass Lowell
>> >>> >> http://jeapostrophe.github.io
>> >>> >>
>> >>> >> "Wherefore, be not weary in well-doing,
>> >>> >> for ye are laying the foundation of a great work.
>> >>> >> And out of small things proceedeth that which is great."
>> >>> >> - D&C 64:33
>> >>> >
>> >>> >
>> >>>
>> >>>
>> >>>
>> >>> --
>> >>> Jay McCarthy
>> >>> Associate Professor
>> >>> PLT @ CS @ UMass Lowell
>> >>> http://jeapostrophe.github.io
>> >>>
>> >>> "Wherefore, be not weary in well-doing,
>> >>> for ye are laying the foundation of a great work.
>> >>> And out of small things proceedeth that which is great."
>> >>> - D&C 64:33
>> >>
>> >>
>> >
>>
>>
>>
>> --
>> Jay McCarthy
>> Associate Professor
>> PLT @ CS @ UMass Lowell
>> http://jeapostrophe.github.io
>>
>> "Wherefore, be not weary in well-doing,
>> for ye are laying the foundation of a great work.
>> And out of small things proceedeth that which is great."
>> - D&C 64:33
>>
>
>
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