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

From: Jim Driscoll <Jim.Driscoll_at_Sun.COM>
Date: Wed, 11 Feb 2009 20:47:22 -0800

"look into Lincoln's bug" has been on my todo list all week.

Sounds like I should make time to actually give it a closer look tomorrow.

Can either of you give me a *short* composite component example that
should work, but doesn't? That'd help a lot. Just something with all
the parts that aren't necessary to reproduce the bug stripped away.

Jim

On 2/11/09 8:10 PM, Lincoln Baxter, III wrote:
> 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 <mailto: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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