I am having trouble to update the view from the bean in the back using PrimeFaces's RequestContext. In the example below I have a button and 2 panels. When pressing the button, I want to update one panel, but not the other one.
It does not work though and I can't find the error! requestContext.update("panela"); is fired, but doesn't do its job!
Help greatly appreciated!
The XHTML file:
<!DOCTYPE html>
<html xmlns="http://www.w3c.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:p="http://primefaces.org/ui"
xmlns:f="http://xmlns.jcp.org/jsf/core">
<h:head/>
<h:body>
<h:form>
<p:panelGrid columns="1">
<p:commandButton value="Save" actionListener="#{runtimeUpdatesBean.save}" />
<p:panel id="panela">
<h:outputText value="#{runtimeUpdatesBean.texta}"/>
</p:panel>
<p:panel id="panelb">
<h:outputText value="#{runtimeUpdatesBean.textb}"/>
</p:panel>
</p:panelGrid>
</h:form>
</h:body>
</html>
The bean:
package com.glasses.primework;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import org.primefaces.context.RequestContext;
@ManagedBean
@SessionScoped
public class RuntimeUpdatesBean {
private String texta;
private String textb;
private boolean outcome;
public String getTexta() {
texta += "a";
System.out.println("RuntimeUpdatesBean.getTexta() = " + texta);
return texta;
}
public String getTextb() {
textb += "b";
System.out.println("RuntimeUpdatesBean.getTextb() = " + textb);
return textb;
}
public void save() {
RequestContext requestContext = RequestContext.getCurrentInstance();
if(outcome) {
System.out.println("RuntimeUpdatesBean.save() = update panela");
requestContext.update("panela");
outcome = false;
} else {
System.out.println("RuntimeUpdatesBean.save() = update panelb");
requestContext.update("panelb");
outcome = true;
}
}
}
Well the problem is the ID of the component that you are referring.
In JSF when you place a component inside
h:form(or Some Primefaces components like TabView), that component's Id will be generated based on theh:formid too.Here is the Example:
In the above case your
p:panel's id will be generated aspanelaForm:panela.In your case since you haven't provided any ID for
h:forma dynamic id will be attached like for examplej_xyz:panela(you can see it using you browser's Inspect Element).So If you wan to access
p:panelwith Idpanelainside the sameh:formthen no need to attach the form Id.But If you want to access the
p:paneloutsideh:formthen you need to attach theh:formid to access it.Solution to you problem is: use an custom ID to your
h:form(which is a best practice by the way..) and access thep:panelby attaching that form ID.And in Managed bean use: