Hi Hue - thanks for your efforts.
I actually just managed to get it working as your mail arrived.
Here is what I had to do:
1) Change the JSP to be
<c:out value="${instanceForm.dynamic.map[fieldName]}" />
(actually just like you suggested)
2) This is the interesting bit - I had to subclass BasicDynaBean
to expose a getMap() method. This is what DynaActionForm
does, and was discussed on the commons-dev list in Nov2002
by Craig, David, and co.
I then had to pass that new class as the 2nd param of the
constructor of BasicDynaClass that creates the instance for me.
Thanks again,
Kev
> -----Original Message-----
> From: Hue Holleran [mailto:[EMAIL PROTECTED]
> Sent: 27 August 2003 13:20
> To: Struts Users Mailing List
> Subject: RE: Problem converting from Struts tags to JSTL
>
>
> Hi Kev,
>
> Sorry - I missed the fieldName being dynamic bit(!). I think
> you may want to consider moving to JSTL for the loop bit so
> it will save having to do conversions but I think the
> following will achieve what you're trying to do:
>
> <bean:define id="fieldNameBean" value="<%=fieldName%>" />
> <c:out value="${instanceForm.dynamic.map[fieldNameBean]}"
> default="uh?" />
>
> BTW you could remove the default="uh?" bit - I use this for
> testing so that I can at least see the loop working.
>
> I don't tend to mix EL with non-EL so this may not be the
> optimum solution - someone else may have a better idea - as I
> guess the performance will be slower and heavier due to
> having to copy a value to a bean in page scope.
>
> Hue.
>
> > -----Original Message-----
> > From: Kevin A. Palfreyman [mailto:[EMAIL PROTECTED]
> > Sent: 27 August 2003 11:32
> > To: Struts Users Mailing List
> > Subject: RE: Problem converting from Struts tags to JSTL
> >
> >
> > Thanks for the pointer to the user guide, but unfortunately
> it doesn't
> > help.
> >
> > I tried:
> >
> > <c:out value="${instanceForm.dynamic.map.<%=fieldName%>}" />
> >
> > And
> >
> > <c:out value='<%="${instanceForm.dynamic.map."+fieldName+"}"%>' />
> >
> > And
> >
> > <c:out value="${instanceForm.dynamic.map.${fieldName}}" />
> >
> > But those didn't work either.
> >
> > I think the problem is with the nested evaluation - combining the
> > scriptlet and the EL.
> >
> > Any other ideas?
> >
> > Kev
> >
> > > -----Original Message-----
> > > From: Hue Holleran [mailto:[EMAIL PROTECTED]
> > > Sent: 27 August 2003 10:21
> > > To: Struts Users Mailing List
> > > Subject: RE: Problem converting from Struts tags to JSTL
> > >
> > >
> > > Try the User Guide:
> > >
> > >
> > > http://jakarta.apache.org/struts/userGuide/building_controller
> > > .html#dyna_act
> > > ion_form_classes
> > >
> > > > -----Original Message-----
> > > > From: Kevin A. Palfreyman [mailto:[EMAIL PROTECTED]
> > > > Sent: 27 August 2003 10:05
> > > > To: [EMAIL PROTECTED]
> > > > Subject: Problem converting from Struts tags to JSTL
> > > >
> > > >
> > > > Hello,
> > > >
> > > > I'm trying to convert some pages from Struts tags to JSTL
> > > for the next
> > > > iteration of our product and I've hit a problem. [Struts
> > > 1.1, Tomcat
> > > > 4.1.24, Java 1.4.2, JSTL 1.0.3]
> > > >
> > > > I need to be able to dynamically access nested fields
> of my form
> > > > object.
> > > >
> > > > The Form object (instanceForm) contains a DynaBean
> > > (dynamic) as one of
> > > > its fields. The fields of the DynaBean are what I'm trying
> > > to access.
> > > > The name of the particular field within the DynaBean is
> stored in
> > > > a local variable (fieldName) that is been populated in a loop.
> > > >
> > > > The following Struts tag works fine:
> > > >
> > > > <bean:write name="instanceForm" property='<%=
> "dynamic."+fieldName
> > > > %>'/>
> > > >
> > > > I'm new to JSTL, and I've tried various forms similar to
> > > those below
> > > > without success. Is what I'm trying to do possible?
> > > >
> > > > <c:out value='<%= "${instanceForm.dynamic."+fieldName %>}'
> > > /> <c:out
> > > > value="${instanceForm.dynamic.<%=fieldName%>}" /> <c:out
> > > > value="${instanceForm.dynamic.${fieldName}}" />
> > > >
> > > > Anyone have any ideas? Or should I stick with the
> Struts tags for
> > > > this?
> > > >
> > > > Thanks in advance,
> > > >
> > > > Kev
> > > >
> > > >
> > > > ---
> > > > Dr. Kevin Palfreyman
> > > > Apama (UK) Ltd,
> > > > Cambridge, UK
> > > >
> > > >
> > > > ---
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