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https://issues.apache.org/jira/browse/MYFACES-3542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13776344#comment-13776344
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Dora Rajappan commented on MYFACES-3542:
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The spec has given preference to c:if over ajax and can be corrected otherwise 
it will defeat the purpose of ajax.
                
> 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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