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https://jira.jboss.org/jira/browse/RF-7622?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Nick Belaevski resolved RF-7622.
--------------------------------
Resolution: Won't Fix
Assignee: Nick Belaevski
rich:columns evaluate expression on view build time, so taking value of
"rendered" expression is not legal on this step.
Return empty value if it shouldn't be processed as a workaround.
> rich:columns var evaluated even when not rendered
> -------------------------------------------------
>
> Key: RF-7622
> URL: https://jira.jboss.org/jira/browse/RF-7622
> Project: RichFaces
> Issue Type: Bug
> Components: component-tables
> Affects Versions: 3.3.1
> Environment: Tomcat 6, Linux
> Reporter: Robin Stocker
> Assignee: Nick Belaevski
>
> When loading the following page on the first time (the first tab is active),
> sandbox.columns is evaluated, even though the tab and the dataTable inside it
> are not rendered.
> <%@ page language="java" contentType="text/html; charset=UTF-8"
> pageEncoding="UTF-8"%>
> <%@ taglib uri="http://java.sun.com/jsf/html"; prefix="h"%>
> <%@ taglib uri="http://java.sun.com/jsf/core"; prefix="f"%>
> <%@ taglib uri="http://richfaces.org/a4j"; prefix="a4j"%>
> <%@ taglib uri="http://richfaces.org/rich"; prefix="rich"%>
> <f:view>
> <a4j:page pageTitle="Example">
> <rich:tabPanel>
> <rich:tab label="First">
> <h:outputText>First!</h:outputText>
> </rich:tab>
> <rich:tab label="Second">
> <rich:dataTable value="#{sandbox.data}"
> var="record">
> <rich:columns
> value="#{sandbox.columns}" var="column">
> <f:facet name="header">
> <h:outputText
> value="#{column.label}" />
> </f:facet>
> <h:outputText
> value="#{record.values[column.id]}" />
> </rich:columns>
> </rich:dataTable>
> </rich:tab>
> </rich:tabPanel>
> </a4j:page>
> </f:view>
> If calculating sandbox.columns is an expensive operation, this slows down the
> load time. Our main navigation is built with tabs and three have rich:columns
> in them, so that has an impact on the load time.
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