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Re: JSF 1.2

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From	lewbloch <lewbloch@gmail.com>
Newsgroups	comp.lang.java.programmer
Subject	Re: JSF 1.2
Date	Wed, 13 Jul 2011 11:32:35 -0700 (PDT)
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On Jul 13, 11:17 am, Chris Riesbeck <Chris.Riesb...@gmail.com> wrote:
> On 7/13/2011 3:03 AM, Pif - 34 wrote:
>
> > Hello,
>
> > I'm working on a project based on JSF1.2. In a XHTML document, I must
> > call a method using a parameter.
>
> > So, since this is not possible directly using standard syntax, I would
> > like to know if one of following solutions is possible that cut be
> > usefull in my code:
>
> > - use an include of a JSP template that do the code I need to place ? In
> > a <html ... > doc, you can only include <html subdocs ?
>
> > - include a JSP tag in the <html> that allow to place javacode ?
>
> > Do you have Id of workarounds ?
>
> For just one such method, you can create a function you can call in the
> JSP expression language. Just two steps:
>
>    - in an appropriate class, define a static method
>    - in a TLD file, declare the function
>
> Details at
>
>    http://download.oracle.com/javaee/1.4/tutorial/doc/JSPIntro7.html
>
> If I have many such methods, I define one "call" method in some utility
> class (error checking code removed) and the associated TLD
>
>    public static Object call(final Object obj, final String methodName,
> final Object arg)
>    throws IllegalAccessException, InvocationTargetException,
> NoSuchMethodException {
>     return obj.getClass()
>               .getMethod(methodName, arg.getClass())
>               .invoke(obj, arg);
>    }
>
> then I can write expressions like the following, where au is the prefix
> for my tag library:
>
>     "${au:call(user, 'getDomainRoles', domain)}"
>
> to call user.getDomainRoles(domain)

Why are people discussing JSP when the OP states that the problem is
in XHTML?

There are other ways, too - for example, set a member variable in a
page-level bean instead of passing a method argument.

I thought EL allowed passing arguments to methods.  I will have to
research this.  It's a problem I've faced before but I don't remember
the solution off the top of my head.  I'll be back on that.

--
Lew

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Thread

JSF 1.2 Pif - 34 <fj@nospam.fr> - 2011-07-13 10:03 +0200
  Re: JSF 1.2 Chris Riesbeck <Chris.Riesbeck@gmail.com> - 2011-07-13 13:17 -0500
    Re: JSF 1.2 lewbloch <lewbloch@gmail.com> - 2011-07-13 11:32 -0700
      Re: JSF 1.2 Travers Naran <tnaran@gmail.com> - 2011-07-17 21:54 -0700

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