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List:       myfaces-dev
Subject:    [jira] [Commented] (MYFACES-3542) The render attribute of AjaxBehavior should support late value exp
From:       "Leonardo Uribe (JIRA)" <dev () myfaces ! apache ! org>
Date:       2012-05-31 15:17:23
Message-ID: 816352059.22248.1338477443560.JavaMail.jiratomcat () issues-vm
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    [ https://issues.apache.org/jira/browse/MYFACES-3542?page=com.atlassian.jira.plugi \
n.system.issuetabpanels:comment-tabpanel&focusedCommentId=13286644#comment-13286644 ] \


Leonardo Uribe commented on MYFACES-3542:
-----------------------------------------

This is an interesting piece of code. I'll describe what I can see, I know you \
already know this but I'm just trying to follow the steps.

In theory, org.apache.myfaces.renderkit.html.HtmlAjaxBehaviorRenderer look for the \
components, get its clientIds, and finally pass them as params when writing the js \
code related to the ajax operation.

In this case, the values passed in "javax.faces.partial.render" request parameter, \
which are the same that were calculated before are just ignored, and the values used \
for identify the affected client behavior, which are used in the decode process (see \
org.apache.myfaces.shared.renderkit.html.HtmlRendererUtils.decodeClientBehaviors() ), \
are used to calculate the affected components, but the good part is if you use c:if \
to skip components from the component tree, they will not be used. 

There is not any reference in the spec about this. "In theory", include it will not \
cause any side effects more than solve the problem described here. The only thing \
that suppose a problem is this propose a different behavior from the one found in the \
RI (Mojarra), maybe not thought by the EG when the spec was built.

I don't know what to do in this case. A custom <f:ajax> component with this behavior \
in mind sounds better for me than change the default behavior. Any thoughts?

                
> The render attribute of AjaxBehavior should support late value expression \
>                 evaluation
> ------------------------------------------------------------------------------------
>  
> Key: MYFACES-3542
> URL: https://issues.apache.org/jira/browse/MYFACES-3542
> Project: MyFaces Core
> Issue Type: New Feature
> Reporter: Bernd Bohmann
> Attachments: late-render-expression-0.png, late-render-expression-1.png, \
> late-render-expression-2.png, late-render-expression-3.png, \
> late-render-expression-4.png, late-render-expression.tgz 
> 
> The render attribute of AjaxBehavior should evaluated during post-back after \
> 'Invoke Application' and before 'Render Response'. It's easly to add this feature \
> with a own PartialViewContext. But there is no call to processPartial with 'Invoke \
> Application'. The Phase 'Render Response' is too late if you are using c:if to skip \
> components from the component tree. See attached example app and pictures.

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