Re: [Springframework-developer] RE: [Springframework] Request Binding

[William G. T. Jr. <wg...@ru...>]

jürgen höller [werk3AT] wrote:

> Hi Rhandy,
> 
> For multiple form objects, you could use custom objects that you bind parameters onto via BindUtils and put in the session as some custom attribute. I consider it preferable to use a different strategy though: Not a map, but a custom root object that contains the form objects as bean properties, like a MyRootObject class with getMyFirstObject and getMySecondFormObject methods. It's easy to bind to the contained objects via nested properties, e.g. "myFirstFormObject.myProperty" and "mySecondFormObject.myOtherProperty".
> 
> Regarding a list of objects, it's probably indeed the best way to parse respective request parameters manually, in a custom onBindAndValidate implementation. Especially if you want to add and remove elements, I can't think of a different way. We could try to bind to an existing list of objects, but it's not too obvious how to go about this (via an index? what if it's a Set, Collection, or Map), so we don't support this yet. If you have an idea how to achieve this, please let me know :-)

There might be something we could borrow from the Japple framework. 
Don't know if this the most elegant solution, but it works.

The Japple framework supports something like this for a Collection of 
objects by maintaining an internal "sequence" for each object and a 
hidden "queryString" which is used to provide hints to the binding 
mechanism.

http://www.japple.org/tutorial/complex_objects.html

Bill



> 
> Regards,
> Juergen
> 
> 
> -----Original Message-----
> From: Rhandy Lado [mailto:rh...@do...]
> Sent: Monday, July 07, 2003 10:49 AM
> To: jürgen höller [werk3AT]
> Subject: [Springframework] Request Binding
> 
> 
> Hi Jurgen,
> 
> I've been using the FormController classes in a few webpages now and
> found that I sometimes need to work with more than one form object. How
> do I return more than two objects and bind each of them in the webpage?
> Should I put each object in a Map and then return the map? If so, how do
> you access the map using the <i21:bind> tags?
> 
> Also, I have a list defined in my form object. Do the <i21:bind> tags
> support binding data to a list? If not, do you have any suggestions on
> how I may go about this? (I was initially thinking of passing back a
> series of request parameters and manually adding these values to the
> form object list but I have a feeling there is a more elegant way of
> doing this.)
> 
> Thanks in advance,
> Rhandy
> 
>