Comments (10)
Gosh, I'm afraid I don't have any satisfying answer for this, sorry... Not possible to do dependant validations at the moment.
We could look at how Json.Decode does that, implementation should be similar.
from elm-form.
I did something like this:
type alias CompanyName =
String
type AccountType
= Private
| Business CompanyName
type alias Registration =
{ email : String
, accountType : AccountType
}
validateRegistration : Validation () Registration
validateRegistration =
let
company =
"company" := oneOf [ string, emptyString ]
in
Validate.succeed Registration
|: ("email" := email)
|: (("accountType" := validateAccountType) |: company)
validateAccountType : Validation e (String -> AccountType)
validateAccountType =
string
|> map
(\s ->
case s of
"business" ->
\x -> Business x
_ ->
\_ -> Private
)
This works but is not ideal, as it allows Business ""
as a valid value.
from elm-form.
Okey, you could try using andThen
like in Json.Decode, because Validation's andThen
follows the same logic:
http://package.elm-lang.org/packages/elm-lang/core/4.0.5/Json-Decode#andThen
from elm-form.
This is the first thing I tried. However if the validation is like
validateRegistration : Validation () Registration
validateRegistration =
Validate.succeed Registration
|: ("email" := email)
|: ("accountType" := string `andThen` accountType)
accountType : String -> Validation e AccountType
accountType s =
case s of
"business" ->
succeed Business |: ("companyName" := string)
_ ->
succeed Private
then andThen
shifts the scope of companyName
under accountType
(the errors include accountType.companyName: InvalidString
). Is this intended? In the case of Json.Decode the "scope" is not shifted.
from elm-form.
Okey, that's not intended, as fair as I can remember.
from elm-form.
I made an example: https://gist.github.com/nmk/e9fd97dd1a62c04fc52545fec5a9b4ef
from elm-form.
Thanks for the example. I'm writing tests first as this change will break things.
from elm-form.
Oh... could you try adding parenthesis like this:
(("accountType" := string) `andThen` accountType)
otherwise andThen
is applying on string
, not on the whole field getter!
from elm-form.
You are right! That works and solves the problem nicely. It would be nice if we could get this in the documentation. I will try to get a PR in next week.
from elm-form.
Just for completeness, here is a link to a working gist: https://gist.github.com/nmk/e9fd97dd1a62c04fc52545fec5a9b4ef
from elm-form.
Related Issues (20)
- Nesting a multiple field validation loses the error HOT 2
- Initial textarea value on IE does not work HOT 3
- Example code typo in README
- Support for Ints? HOT 2
- validation it kick off onBlur for initially empty values HOT 1
- Providing default values to nested records?
- How to validate input1 value is the same as input2 value HOT 1
- Email validator too permissive? HOT 2
- Custom Error after validating through an API
- Why is "elm-test" a dependency? HOT 2
- Why no Form.Cancel message?
- Validation error doesn't appear under `liveError`
- Ability to persist form state as JSON ?
- Dependency on elm-test causes compatibility error HOT 1
- Exception Thrown in Output. ReferenceError: Elm is not defined
- Extend Form.Input to support date input
- Example does not compile (Elm 0.19.1)
- Losing type safety should be emphasized HOT 4
- Form Input maintained on Reset HOT 2
- Form validation for more than 8 fields? HOT 1
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from elm-form.