Rerender component with backing bean (binding attribute)

[sutermar]

Hi,

i want to rerender a backing bean, if i click on a link with an action listener.
Is that possible?

I've made the following sample.
The outputText with id="rep" will be updated successfully (i use a value binding).
The outputText with the backing bind (binding) doesn't update.

Environment:
Java 1.5.0_11
Tomahawk 5.5
MyFaces 1.1.5
Ajax4JSF 1.1.1


test.jsp:

<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
<%@ taglib prefix="h" uri="http://java.sun.com/jsf/html" %>
<%@ taglib prefix="f" uri="http://java.sun.com/jsf/core" %>
<%@ taglib prefix="a4j" uri="https://ajax4jsf.dev.java.net/ajax" %>

<%@ include file="pages/noCache.jsp" %>

<f:view>
<a4j:page format="html-transitional">

 <h:form>
 <a4j:log hotkey="M" />

 <a4j:commandLink actionListener="#{bean.perform}" reRender="rep,aaa">
 <h:outputText value="testlink"/>
 </a4j:commandLink>

 <h:inputText size="50" value="#{bean.text}" >
 <a4j:support event="onkeyup" reRender="rep"/>
 </h:inputText>

 <h:outputText value="#{bean.text}" id="rep"/>

 <h:outputText binding="#{bean.output}" id="aaa"/>
 </h:form>
</a4j:page>
</f:view>

Simple Java bean:

package com.assentis.docwrite.htmlclient.beans;

import javax.faces.component.html.HtmlOutputText;
import javax.faces.event.ActionEvent;

public class Bean
{
 private String text;
 private String aaa = "Nothing";

 public String getText() {
 return text;
 }

 public void setText(String text) {
 this.text = text;
 }

 public void perform(ActionEvent event)
 {
 this.text = "link performed";
 this.aaa = "output element changed";
 }

 public HtmlOutputText getOutput()
 {
 HtmlOutputText text = new HtmlOutputText();

 text.setValue(this.aaa);

 return text;
 }

}

in faces-config.xml:

<managed-bean>
 <managed-bean-name>bean</managed-bean-name>
 <managed-bean-class>com.assentis.docwrite.htmlclient.beans.Bean</managed-bean-class>
 <managed-bean-scope>session</managed-bean-scope>
 <managed-property>
 <property-name>text</property-name>
 <value />
 </managed-property>
</managed-bean>

[sutermar]

I've found a (very ugly) solution, but it works:

1. added action="update" to the ajax command link

2. added this navigation rule to faces-config.xml:

<navigation-rule>
 <from-view-id>/test.jsp</from-view-id>
 <navigation-case>
 <from-outcome>update</from-outcome>
 <to-view-id>/test.jsp</to-view-id>
 </navigation-case>
</navigation-rule>

But now, the whole page will be refreshed!
What I want is, that only the outputtext with id="aaa" and id="rep" will be updated on the view side...

[sergeysmirnov]

yes, it will be non-ajax response. Moreover, the component tree will be re-built.

For the testing purpose, replace

<a4j:commandLink actionListener="#{bean.perform}" reRender="rep,aaa">
 <h:outputText value="testlink"/>
</a4j:commandLink>

with

<h:commandLink actionListener="#{bean.perform}">
 <h:outputText value="testlink"/>
</h:commandLink>

Does the values are updated as you expect?

[sutermar]

Hi Sergey,
thanks for your response!

yes, the values are updated too...

But my goal is to use the ajax functionality and not to refresh the whole
page... I have to find a solution to rerender a backing bean... is that possible?

Maybe there's a chance to rebuild some parts of the jsf view in the bean.perform method, like this way:

1. Click on the ajax command link
2. JSF calls action listener on bean.perform
3. Refreshing only the view from the output element with id = "aaa"
4. on the view side: rerendering of "rep" and "aaa"