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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