Hi, Nikolaos
I don't think the choice of JS framework could affect validation in any
way. After all you do use ajax, don't you? :)
Here's how we solved it in one of our projects:
1. On client side we add an event listener to each form field (we listen
for onChange event).
2. This event listener does a plain vanilla ajax request. Something like:
/my/action/bean?fieldName=User+Value&ajaxValidate=atrue
In our action bean we have fields with some validation rules and
(optionally) custom methods assigned. If we leave it as is it won't handle
our request correctly because some other fields might be required. That's
why ..
3. Our action bean implements ValidationErrorHandler [1] interface to
hijack the default validation handling mechanism.
4. By the time handleValidationErrors method is called all validation
rules are already applied and ValidationErrors array is already filled in.
5. Inside this handleValidationErrors we check for ajaxValidate parameter
in request and if it's present we filter out validation errors
corresponding to filedName field.
6. If no errors are found we return a JSON {status: 'ok'}. Otherwise we
return JSON with validation errors.
7. On a client side aour Ajax callback function expects a JSON response
data. If JSON has any errors we show them to user.
It's not really hard to implement ajax validation this way and it's
completely library-agnostic. In our project we use jQuery so I don't show
the code to you to avoid confusion. But if you follow the guidelines
that's going to be easy.
Note that we still required to have a ajaxValidate handler defined in our
action bean. It's going to be invoked when the last field in a form is
being validated and is going to pass validation. This is because in this
case ValidationErrors array is empty and handleValidationErrors isn't
called. If this method isn't defined Stripes will use a default handler -
and it might be not something you intend to.
Cheers,
Andrey
[1]
http://stripes.sourceforge.net/docs/current/javadoc/net/sourceforge/stripes/validation/ValidationErrorHandler.html
On Mon, 15 Nov 2010 20:05:09 +0200, Nikolaos Giannopoulos
<nikol...@brightminds.org> wrote:
> Hi,
>
> I noticed the following page which shows how to integrate Stripes w/
> client side validation via JQuery:
> http://www.stripesframework.org/display/stripes/Validation+Reference#ValidationReference-Usingthe{{fieldmetadata}}tag
>
> Has anyone done anything similar w/ MooTools?
>
> If so, was it a rewrite of Aaron's code or did it hook into MooTools
> Form Validation?
>
> And if so - anything shared would be appreciated.
>
> We are debating whether to do this now (though are short on time - what
> else is new) but anything that accelerates that could help us and in
> turn we would post it back to the community. I also realize the effort
> isn't huge but JQuery notation is new to me and doing this right w/
> MooTools and classes will result in a pretty extensive re-write I'm
> afraid.
>
> Lastly, this is probably a stretch but did anyone solve the localization
> issue in all of this i.e. localized error messages exist in resource
> bundles on the Stripes server side yet the messages need to be
> accessible to provide the correct message to the user... Ajax is one
> possibility... using a generic set of translated messages is another...
> but all don't appear optimal.
>
> Much Appreciated.
>
> --Nikolaos
>
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