[html-formfu] Clientside validation

[Andreas Marienborg]

On Mar 5, 2008, at 10:54 AM, Carl Franks wrote:

> On 05/03/2008, Andreas Marienborg <omega at palle.net> wrote:
>> Has anyone done any clientside validation with FormFu? Basicly I want
>> to only specify constraints etc once, in the FormFu-config, and then
>> just have it magicaly work on the forms in the web app, or atleast
>> provide me with the information needed to do the client side stuff
>> (like what constraints are on a field etc).
>>
>> If that is not possible, is it possible to process only "part" of a
>> form? So I can call back to the server to check each field as they  
>> are
>> filled out?
>>
>>
>> If anyone has any thoughts on any of this, I would be glad to hear it
>
> I put this JS demo together about a year ago.
> http://www.fireartist.com/tmp/client-side-constraint.html
>
> It supports filters & constraints and uses the same error markup that
> server-side validation would generate.
>
> At the moment, it uses an old version of dojo.
> It would probably be best to have the more advanced functionality
> (such as class name changes) isolated in core functions, and allow
> them to be implemented in different frameworks - and have the
> individual constraints, filters, etc only use standard JS.
> Although, if someone's willing to write the necessary functions in
> cross-browser JS so that we don't need an external library, that would
> be great.
>
> I created the branch /branches/auto-js for this, but have never
> checked the changes in, so I'll probably need to start from scratch as
> the internals have changed so much since the branch was made.
>
> I imagine it being implemented such that you can switch it on with
> something like:
>
>    clientside_validation: 1
>    clientside_library: 'Dojo'

That sounds ideal. I would whip up a MochiKit implementation asap :p

However, is it possible to easily manipulate what is outputed, so as  
to add information about constraints etc to the markup?


- andreas