On Tue, 23 Nov 2004 13:45:37 -0500, Rick Reumann <[EMAIL PROTECTED]> wrote: > First off, Craig if you are reading this, how come no one has started a > jsf-users mailing list? I hate using web forums. yuk:) Seems like
I'm not a huge fan of web forums either, but that's what JSF has to deal with :-). (Free registration required) http://forum.java.sun.com/forum.jspa?forumID=427 > > First, let me frame my question in light of real life terms that we have > to deal with. We have some complex nested value objects that return from > the backend. Typically the user on the front end is provided the > opportunity to modify just a few of the nested VO properties. The nested > VOs are thus stored in Session scope which makes it very easy to return > back the full VOs with the modified properties (after BeanUtils does the > copying of the request params). For those that are wondering why not > just create an ActionForm to capture the single properties you need, the > answer is this would be a nightmare to then figure out how to get those > properties from your from back into the correct spots in the different > ValueObjects. (By the way, I don't think the backend should need to > provide ways to handle how the front is giving you the data so the > backend 'should' be able to just give me a VO with nested VOs inside). > All of this works completely fine in a Struts environment and is made > really easy by the use of the nested tag. (Validation is handled on the > backend). > > My question then becomes... will JSF be able to handle nested objects > just as easily? I'm assuming it should but I haven't explored any of the > JSF tags. I'm assuming that at the very least I could do like I would do > it with JSTL and Strtus (not using the Nested tag) and be able to write > a JSF input maybe like: > > <h:inputText > value="#{someVo.someList[${someHandleToAnIndexInLoop}].someList[${someHandleToAnIndexInLoop}].someList[${someHandleToAnIndexInLoop}].someValue}"/> > > Of course it would ne nicer with an nested tag equivalent, but the above > will work. Just checking to make sure JSF can deal with this in some way > before I get started. If not, I'm really stuck not being able to use > JSF, since our business requirements are complex and the objects coming > from the backend will be nested and I need to return them back to the > backend in their modified form. (I also don't want to have to hardcode a > bunch of hidden variable place holders so that's why I'm using Session > to store the VOs). > > Thanks for any light on this issue. > JSF can indeed deal with nested expressions for its value bindings ("#{foo.bar.baz}), but you won't be able to intermix JSF expressions "#{...}" and JSP expressions "${...}" because the JSF tags all turn off evaluation of runtime expressions (to avoid potential cross site scripting like attacks). So, something like this should work: <h:inputText value="#{someVo.someList[someHandleToAnIndexInLoop].someList[someHandleToAnIndexInLoop].someList[someHandleToAnIndexInLoop].someValue"/> Note that JSF basically does away with the need for a form bean because the components themselves do what we use form beans for (holding the string version of the input data so it can be redisplayed if conversion fails). > -- > Rick Craig --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
