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