On Thu, Jun 6, 2013 at 12:49 PM, Daniel Crisan <[email protected]> wrote:
> Yes, you are right but that is the case when you can compare the value from
> one field with the one from another field. It's a bit complicated. There are
> more than 2 fields and different cases like:
> if field_1 == '"some value"'
> if field_2 == "some value"
> field_3 must be ....
> if field_2 == "other value"
> field_3 must be.....
I don't see why you shouldn't be able to implement this using a form validator.
>
> Anyway, solved the issue (don't have the code here but as I recall it it
> goes something like):
>
> args = ()
> args = args + (form inputs.....,)
>
> class page():
> def __init__(self): - will define validators and the form as class
> variables
> self.v=[] - this will hold the validators
> self.myform =form.Form(validators=self.v, *args)
> def GET()
> define the classic GET here
> def POST():
> pdata = web.input(checkboxes_array_with_same_name=[])
> if not self.myform.validates(pdata):
> return render.page(self.myform)
> else:
> if pdata.some_input == do all the checks here
> if pdata.some_other_input - do some other checks and
> if necessary make another if
> self.v.append(form.Validator("error message",
> False)
> self.myform = form.Form(validators=self.v,
> *args)
> return render.page(self.myform)
> elif .....add additional restrictions based on any post data
> received
> else:
> code for form valid
>
> I don't see anything wrong with this approach, it loops the same page until
> the form data is valid. Do you see something wrong?
There is nothing wrong with that besides a less maintainable
controller; compare the snippet above with one missing the the else
branch (all the validation logic has been segregated into the form
validator): you will agree with me that the resulting controller
would be easier to read and maintain.
Cheers,
Matteo
>
>
>
> On Thu, Jun 6, 2013 at 1:20 PM, Matteo Landi <[email protected]> wrote:
>>
>> On Wed, Jun 5, 2013 at 6:02 PM, Daniel Crisan <[email protected]>
>> wrote:
>> > Hello,
>> >
>> > I have a form with 2 inputs (textboxes, checkboxes, doesn't matter) and
>> > I
>> > need to add a validator for another field only if one of the inputs is
>> > equal
>> > to some value.
>> >
>> > Is this possible?
>>
>> Sure, by using a general form validator. Have a look at the following
>> snippet:
>>
>> signup = form.Form(
>> form.Textbox('username'),
>> form.Password('password'),
>> form.Password('password_again'),
>> validators = [form.Validator("Passwords didn't match.", lambda i:
>> i.password == i.password_again)]
>> )
>>
>> As you can see, when you create a form you can pass an additional list
>> of which that can work on the form as whole (i.e. access all the
>> registered fields); there shouldn't be too hard to adapt the previous
>> example to your specific use case.
>>
>> Please, get back to us if you need further help.
>>
>>
>> Cheers,
>>
>> Matteo
>>
>>
>> >
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>
>
>
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