Re: [webtier] JSF 2.0 composite components with method-valued attributes

From: Lincoln Baxter, III <lincolnbaxter_at_gmail.com>
Date: Wed, 11 Feb 2009 23:10:09 -0500

I've experienced a similar issue when attemting to pass a validator=""
through a composite component.

(possibly got the wrong exception names here, I don't have a
working-broken example in front of me. har har)

JSF will throw a ClassCastException and complain that it was expecting
an ElFieldExpression but got an ElMethodExpression , even if I specify
the method-signature="" attribute in my composite:interface. I want to
pass-through a validator method of the form #{myBean.validatorMethod},
but haven't been able to find a way to do this. Been having lots of
qwerky issues like this actually. ActionListeners you know I'm already
having some issues with, still haven't figured that one out, wish I
could provide more details.

--Lincoln

On Wed, 2009-02-11 at 15:21 -0800, Jim Driscoll wrote:

> Well, when I did the following blog,
> http://weblogs.java.net/blog/driscoll/archive/2008/12/jsf_20_wiring_u_1.html
>
> I had two attribute methods that weren't named "action" - they were
> named move1to2 and such.
>
> I haven't pored over the rest of your email, yet, but will when I have a
> minute.
>
> Jim
>
> On 2/11/09 3:04 PM, webtier_at_javadesktop.org wrote:
> > Hello,
> >
> > I wonder if method-expression passing through a composite component attribute is supposed to work. I just want be able to specify an "action" method which would be passed to a command button. Unfortunately, the code works only if the attribute has the name "action". And I wanted to get this method from a controller. Here's a code sample:
> >
> >
> > <?xml version='1.0' encoding='UTF-8' ?>
> > <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
> > <html xmlns="http://www.w3.org/1999/xhtml"
> > xmlns:ui="http://java.sun.com/jsf/facelets"
> > xmlns:c="http://java.sun.com/jsp/jstl/core"
> > xmlns:f="http://java.sun.com/jsf/core"
> > xmlns:h="http://java.sun.com/jsf/html"
> > xmlns:composite="http://java.sun.com/jsf/composite">
> >
> > <composite:interface name="adjustableColumnHeader">
> > <composite:attribute name="header" required="true" type="String" shortDescription="header to use"/>
> > <composite:attribute name="action" method-signature="java.lang.String act()" targets="hidebutton"/>
> > </composite:interface>
> > <composite:implementation>
> > <th>
> > <h:panelGrid columns="2">
> > <h:outputText styleClass="tableHeader" value="#{compositeComponent.attrs.header}"/>
> > <h:commandButton id="hidebutton" value="hide"
> > action="#{compositeComponent.attrs.action}"/>
> > </h:panelGrid>
> > </th>
> > </composite:implementation>
> > </html>
> >
> > it is used later like:
> > <composite:interface name="adjustableColumnHeader">
> > <composite:attribute name="header" required="true" type="String" shortDescription="header to use"/>
> > <composite:attribute name="headerClass" required="false" type="String" shortDescription="header class to use"/>
> > <composite:attribute name="alwaysShown" required="false" type="Boolean" default="false" shortDescription="if true the column cannot be hidden"/>
> > <composite:attribute name="firstOne" required="false" type="Boolean" default="false" shortDescription="if true this is the first column, hide button is rendered at its he
> > <composite:attribute name="action" method-signature="java.lang.String act()" targets="hidebutton"/>
> >
> > <composite:attribute name="tablebean" required="true" shortDescription="a controller">
> > <composite:attribute name="shownItems" required="true" type="java.util.Map" shortDescription="map which lists shown items"/>
> > 
> >
> > 
> > <h:selectBooleanCheckbox rendered="#{not compositeComponent.attrs.alwaysShown}"
> > value="#{compositeComponent.attrs.tablebean.checkboxes[compositeComponent.attrs.header]}"/>
> > </h:panelGrid>
> > </th>
> > </composite:implementation>
> >
> > and of course then I cannot choose the name of the attribute.
> >
> > Also it's a bit strange Jim's controller example uses only attribute-properties and
> > no attribute-methods. I guess turning switchlist example into a controller based one,
> > as Ed originally suggested, would be a lot of clue here.
> >
> > Thanks a lot in advance!
> > [Message sent by forum member 'nzinoviev' (nzinoviev)]
> >
> > http://forums.java.net/jive/thread.jspa?messageID=331385
> >
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