[FormProc-developer] RE: Validation by type

[Eric B. <eri...@ho...>]

Hi Anthony,

The goal of this demand, it's just to give the option to the user,
to use FormProc as "validation by name" or "validation by type".  It's
not necessarily for a DBForms compatibility.


If I re-use the same example, here I have 4 textfields using the same
type of validation ("phoneCanada") and it can be re-use again in
several other JSP pages.

<db:textField fieldName="phoneWork" fieldValidator="phoneCanada"/>
<db:textField fieldName="phoneHome" fieldValidator="phoneCanada"/>
<db:textField fieldName="phoneCell" fieldValidator="phoneCanada"/>
<db:textField fieldName="fax"       fieldValidator="phoneCanada"/>

Actually, if I want to do validation, I need to create 4 elements
("phoneWork", "phoneHome", "phoneCell", "fax") in "example-form.xml"
and if fieldname haven't the same name in other JSP pages, we must to create 
as much of elements in "example-form.xml" as we have differents
fieldnames ...

Like this we will do a lot of duplication of element/validator and in
reel, it's the same validation.



To continue, maybe we can re-use FormProc for parameter validator
in EJB, Web apps, Web Service, ... on the same server.  This give you
the opportunity to declare "Enterprise Validation Type" (EVT).
You declare each type of validator in your xml file and it can be
re-use by any kind of applications on this server ...   or remotly
using EJB.

Because enterprise web server contains a lot of differents web apps on the 
same server and frequently use the same validation type, like this
we can re-use it ...

By adding the "context" (getter/setter) to the "FormData" class,
when we call the process method, we will be enable to pass a context
of this validation.

ArrayList formDataList = new ArrayList();
formDataList.add(new FormData("phoneCanada",
                              request("phoneWork"),"phoneWork"));
formDataList.add(new FormData("phoneCanada",
                              request("phoneHome"),"phoneHome"));
...

But if a user want to work in "name" mode, it can continue to use
the FormData("elementName", "value") constructor.


Naturally, we need to be enable to retrieve the context in validation
result.

I think it's a good way to manage re-usable validation of data.  Without
modifying the core of FormProc.


Thanks.


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