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
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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