[richfaces-issues] [JBoss JIRA] (RF-11382) Datatable and ExtendedDatatable evaluate value attribute even if rendered=false

[Frederick Kämpfer (Commented) (JIRA)]

    [ https://issues.jboss.org/browse/RF-11382?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12632373#comment-12632373 ] 

Frederick Kämpfer commented on RF-11382:
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Wrapping it in a h:panelGrid/panelGroup (with rendered=false) does not make a difference, the value attribute is still evaluated. However, if you set the parent form's render attribute to false it seems to work. However that's not always feasible.

My workaround currently is to return an empty collection, if the table's parent togglePanel is not rendered.
                
> Datatable and ExtendedDatatable evaluate value attribute even if rendered=false
> -------------------------------------------------------------------------------
>
>                 Key: RF-11382
>                 URL: https://issues.jboss.org/browse/RF-11382
>             Project: RichFaces
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: component-tables
>    Affects Versions: 4.0.0.Final, 4.1.0.Milestone2
>         Environment: Fedora 15, Glassfish 3.1.1, CDI (Weld)
>            Reporter: Frederick Kämpfer
>            Assignee: Zuzka Krejčová
>             Fix For: 4.2.0.Tracking
>
>
> In Richfaces 4 both datatable and extendedDatatable evaluate the value attribute even when rendered is set to false, even though it is not necessary. This makes it hard to achieve performance by trimming parts of the view tree. The built-in h:dataTable behaves correctly in that case.
> To reproduce simply try this snipplet:
> {code:xml}
> <h:form>
>      <rich:dataTable value="#{myBean.property}" rendered="false">
>       </rich:dataTable>
> </h:form>
> {code}
> Side note: The reason I'm posting this is, that i want to embed a rich:dataTable in a ajax loaded rich:togglePanelItem which is loaded on demand. Probably fixing the "render" problem will also make the dataTable lazy-loadable when switching to the corresponding togglePanelItem.
> I hope this is no duplicate, I only found RichFaces 3 issues mentioning this problem.

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