Call a method when I go to another page JSF

[Mario Gimenez]

Hi!.
I have a web application using jsf.
I have beanA in session and beanB in session
My problem is this.
I have a pageA and a pageB. in PageA a have a selectOneMenu component and in the Bean - @PostConstruct method I call a query to load an arraylist for the selectOneMenu,
In PageA I can delete , update and create new item for this list.
In pageB I must use this list (but I use another bean in session ). but here's the problem. because the bean is in session this list can't update whit the new values and I can't change session to request.
DO you have any ideas for solving this?
My idea is when I go to one page to another, update the data. I used binding but didn't work for me.
I want to do this:
When I stay in page B and I want to go to page A the value of the selectOneMenu update.


the code is this.
pageB

<h:panelGrid border="0" columns="2" width="700">
							<h:column>
								<h:outputText for="tipoParametro" value="#{msg.labelEtiquetaGrupoEtiquetas}" styleClass="label"></h:outputText>
								<t:selectOneMenu value="#{etiquetaBean.idGrupoEtiqueta}"
									valueChangeListener="#{etiquetaBean.cargarComboEtiquetas}" 
									immediate="true" onchange="submit();" styleClass="combo" >
									<f:selectItems value="#{etiquetaBean.grupoEtiquetas}" />
									
									
									
								</t:selectOneMenu>
							</h:column>							
						</h:panelGrid>	

cargarComboEtiquetas is called in the @PostConstruct

and page A is the same. in pageA I only update, create and delete values for my list.

I hope I explain my problem.

I need help!!!

[Brendan Healey]

Instead of building the list with @PostConstruct, why not use a preRenderView event:

<f:event type="preRenderView" listener="#{bean.setupPage}"/>

public void setupPage(ComponentSystemEvent cse) {
  ... reload list from database ...
}

Then your updating page persists new values to the database, you navigate to the other page and the preRenderView
event fires, reloading from the database.

Regards,
Brendan.

p.s. the f:event tag needs to go inside f:metadata tags. This event fires on ajax postback and it's a good idea to check
if it's an ajax request and return early, if so desired.

[Mario Gimenez]

Hi
Thanks for your help!
I try that solution but it doesn't work for me.
I need to know in which place of the page I must put this line. Inside f:view or inside f:form ? or another place...

I go to page A to B but this event never stop in setupPage. Can you help me please?
Thanks!!!

[Brendan Healey]

Hi, this is the structure you require, note that the f:viewParam is a workaround for a horrible bug and it won't do any
harm:

<f:view contentType="text/html">
        <f:metadata>
            <f:viewParam name="dummy"/>
            <f:event type="preRenderView" listener="#{bean.setupPage}"/>
        </f:metadata>
        <h:head>
        ...

Regards,
Brendan.

[Mario Gimenez]

thanks a lot!.
It's works only whit f:event inside the view!.

[Brendan Healey]

There you go then. Have a good day.