[hunchentoot-devel] form validation

[Ala'a (cmo-0)]

One possible way is to define your own protocol:

(add-validation validation-forms "error message")

(valid-p object) returning two values, Boolean representing validity
after applying all validation rules. otherwise returning nil and the
second
value holding errors if they exists. then you can use it with
multiple-value-bind

(multiple-value-bind (valid-p errors) (validate object)
  (if valid-p
     (save object) ; persist it
     (otherwise report back the errors to the user))


this is only a sketch, you may use any thing else that suits your requirements.

regards,

Ala'a (cmo-0)



On Thu, Aug 27, 2009 at 12:26 PM, Eric Abrahamsen<girzel at gmail.com> wrote:
> define-easy-handler has some pretty extensive features for accepting
> GET/POST parameters, but when it comes to validating those parameters,
> and possibly returning errors to the client, it seems like the only
> viable thing to do is write a standard handler function and work with
> get-parameters* and post-parameters* directly.
>
> Does anyone have any experience to share in this direction? How is
> everyone handling more complex form validation and error reporting?
> Has there ever been any talk of a small external library for doing
> validation?
>
> Eric
>
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