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How to ajax-refresh dynamic include content by navigation menu? (JSF SPA)
(3 answers)
Closed 7 years ago.
In JSF2, is it possible to change the of value of src of ui:include dynamically using Ajax request (like for example PrimeFaces p:commandButton)?
Thank you.
<h:form>
<h:commandLink value="Display 2" action="#{fTRNav.doNav()}">
<f:setPropertyActionListener target="#{fTRNav.pageName}" value="/disp2.xhtml" />
</h:commandLink>
</h:form>
<ui:include src="#{fTRNav.pageName}"></ui:include>
That's what I have right now. Is it possible to make it Ajax (using p:commandButton)?
The JSTL tags as proposed in the other answer are not necessary and it is not nicely reuseable.
Here's a basic example using pure JSF (assuming that you runs Servlet 3.0 / EL 2.2, otherwise you indeed need to use <f:setPropertyActionListener> like as in your question):
<h:form>
<f:ajax render=":include">
<h:commandLink value="page1" action="#{bean.setPage('page1')}" />
<h:commandLink value="page2" action="#{bean.setPage('page2')}" />
<h:commandLink value="page3" action="#{bean.setPage('page3')}" />
</f:ajax>
</h:form>
<h:panelGroup id="include">
<ui:include src="#{bean.page}.xhtml" />
</h:panelGroup>
with
private String page;
#PostConstruct
public void init() {
this.page = "page1"; // Ensure that default is been set.
}
// Getter + setter.
here is how I render subcontent dynamically using MnagedBean. First I set page in the center (that will be changed by menu triggers) with private String name="/main_pages/mainpage.xhtml", then each time submenu is clicked the HelloBean resets "name" and contents is updated by update=":content" - then new name is retrieved from Bean:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:p="http://primefaces.org/ui">
<h:head>
<f:facet name="first">
<meta content='text/html; charset=UTF-8' http-equiv="Content-Type"/>
</f:facet>
</h:head>
<h:body>
<p:layout fullPage="true">
<p:layoutUnit position="north" size="150" resizable="true" closable="true" collapsible="true">
<h1>Madeline<br>shop</br></h1>
</p:layoutUnit>
<p:layoutUnit position="south" size="100" closable="true" collapsible="true">
Zapraszamy do odwiedzania naszego biura!
</p:layoutUnit>
<p:layoutUnit position="west" size="175" header="Menu" collapsible="true">
<h:form>
<p:menu>
<f:ajax render=":content">
<p:menuitem value="O naszej agencji" action="#{helloBean.setName('/main_pages/onas.xhtml')}" update=":content" />
<p:menuitem value="Ubezpieczenia pojazdów" action="#{helloBean.setName('/main_pages/ubpoj.xhtml')}" update=":content" />
<p:menuitem value="Ubezpieczenia majątkowe" action="#{helloBean.setName('/main_pages/ubmaj.xhtml')}" update=":content" />
<p:menuitem value="Ubezpieczenia na życie" action="#{helloBean.setName('/main_pages/ubnaz.xhtml')}" update=":content" />
<p:menuitem value="Zapytaj" action="#{helloBean.setName('/main_pages/zapytaj.xhtml')}" update=":content" />
<p:menuitem value="Kontakt" action="#{helloBean.setName('/main_pages/kontakt.xhtml')}" update=":content" />
</f:ajax>
</p:menu>
</h:form>
</p:layoutUnit>
<p:layoutUnit position="center">
<br></br><br></br>
<p:panel id="content">
<ui:include src="#{helloBean.name}" />
</p:panel>
</p:layoutUnit>
</p:layout>
</h:body>
</html>
my ManagedBean:
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import java.io.Serializable;
/**
*
* #author root
*/
#ManagedBean
#RequestScoped
public class HelloBean implements Serializable {
/**
* Creates a new instance of HelloBean
*/
private static final long serialVersionUID = 1L;
private String name="/main_pages/mainpage.xhtml";
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
You need to use the <c:if test="condition"> tag around the ui:include and then when the ajax button is clicked, the panel that holds the ui:include is refreshed.
Example:
First make sure that the jstl core taglib is included by inserting the following namespace in the document:
<html xmlns:c="http://java.sun.com/jsp/jstl/core>"
Then, you can use the <c:if> tag as follows :
<c:if test="#{!logBean.loggedIn}">
<ui:include src="loginpage.xhtml" />
</c:if>
<c:if test="#{logBean.loggedIn}">
<ui:include src="home.xhtml" />
</c:if>
Related
I have a strange situation with a composite component. I'm using it all over my web application but now I noticed that if I update a form containing my composite component, the component get's rendered twice (at times).
My component (let's say it's called datecc) is defined as follows:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html
PUBLIC '-//W3C//DTD XHTML 1.0 Transitional//EN'
'http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd'>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:composite="http://java.sun.com/jsf/composite" xmlns:f="http://java.sun.com/jsf/core" xmlns:h="http://java.sun.com/jsf/html" xmlns:p="http://primefaces.org/ui">
<h:body>
<composite:interface>
<composite:attribute name="value"/>
<composite:attribute name="shortFormat"/>
<composite:attribute name="style"/>
<composite:attribute name="styleClass"/>
<composite:attribute default="false" name="inputLabel"/>
</composite:interface>
<composite:implementation>
<span id="#{cc.clientId}">
<h:outputText rendered="#{not cc.attrs.inputLabel}" style="#{cc.attrs.style}" styleClass="#{cc.attrs.styleClass}" value="#{cc.attrs.value}">
<f:convertDateTime pattern="#{cc.attrs.shortFormat ? 'dd/MM/yy' : 'dd/MM/yyyy'}" timeZone="#{timezone}"/>
</h:outputText>
<span>asdasdfasdf</span>
<h:inputText disabled="true" rendered="#{cc.attrs.inputLabel}" style="#{cc.attrs.style}" styleClass="#{cc.attrs.styleClass}" value="#{cc.attrs.value}">
<f:convertDateTime pattern="#{cc.attrs.shortFormat ? 'dd/MM/yy' : 'dd/MM/yyyy'}" timeZone="#{timezone}"/>
</h:inputText>
</span>
</composite:implementation>
</h:body>
</html>
The page I'm calling it from is something similar to this:
<h:form id="form">
<p:dataTable id="rowsTable" value="#{myBean.rows}" var="it"
selectionMode="single" selection="#{myBean.selectedRow}" rowKey="#{it.key}"
rowStyleClass="#{myBean.isRed(it) ? 'red' : null}">
<p:ajax event="rowSelect" update=":menuForm :detailForm :contextualMenu"/>
<column>....</column>
<column><mycc:datecc value="#{it.date}" inputLabel="true" /></column>
</p:dataTable>
</h:form>
<h:form id="detailForm>
<!-- this field is rendered twice once I select a row in the above table -->
<mycc:datecc value="#{myBean.selectedRow.date}" inputLabel="true" />
</h:form>
I'm unfortunatelly doing some work on the setSelectedRow method in my bean #Named #ConversationScoped public class MyBean { ... } however I don't think that's causing the problem.
I solved my problem by implementing the following class.
package com.company.faces.cc;
import javax.faces.component.FacesComponent;
import javax.faces.component.NamingContainer;
import javax.faces.component.UIInput;
import javax.faces.component.UINamingContainer;
#FacesComponent("inputDate")
public class Date extends UIInput implements NamingContainer {
#Override
public String getFamily() {
return UINamingContainer.COMPONENT_FAMILY;
}
}
Although I don't really know why this solves the issue since it doesn't add much to the component.
Trying to use an ajax request to render a label without refreshing the entire page. So far every time I click the command button the whole page refreshes still and I can't seem to figure out what I am doing wrong.
Search By Title..
<h:commandButton class="addButton"
id="checkStatusButton"
value ="Check Status"
action = "#{itemWeb.findItem}">
<f:ajax execute="checkStatusForm"
event="click"
render="statusLabel"/>
</h:commandButton>
<h:outputText id="statusLabel"
value="#{itemWeb.foundItem.status}">
</h:outputText>
The page refresh because you do not use JSF Standard tags(h:head, h:body).
Thus, you should change the index.xhtml to below example.
<!--
Index.html setup
Holds the form for input data
-->
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:ui="http://java.sun.com/jsf/facelets">
<h:head>
<link href='http://fonts.googleapis.com/css?family=Roboto'
rel='stylesheet' type='text/css'></link>
<link href='resources/css/main.css'
rel='stylesheet' type='text/css'></link>
<title>
<ui:insert name="title"
Library Management System
</ui:insert>
</title>
<!--
Quick style setup..
-->
</h:head>
<h:body>
<h:form id="checkStatusForm">
<div class="group">
<h:inputText id="searchCheckInput"
value="#{itemWeb.searchString}">
</h:inputText>
<label>Search By Title..</label>
<span class="highlight"></span>
<span class="bar"></span>
</div>
<h:commandButton class="addButton"
id="checkStatusButton"
value ="Check Status"
action ="#{itemWeb.findItem}">
<f:ajax execute="checkStatusForm"
event="action"
render="statusLabel"/>
</h:commandButton>
<h:outputText id="statusLabel"
value ="#{itemWeb.foundItem.status}">
</h:outputText>
</h:form>
</h:body>
</html>
See also: Adding HTML Head and Body Tags
Try to process only the desired field rather than the whole form, in the execute attribute:
<h:commandButton class="addButton" id="checkStatusButton" value ="Check Status" action = "#{itemWeb.findItem}">
<f:ajax execute="searchCheckInput" event="click" render="statusLabel"/>
</h:commandButton>
You need to use event="action" instead of event="click". The event="action" is namely the default event the is listening on when nested in an h:commandButton component.
An example is shown below.
xhtml
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core">
<f:view contentType="text/html">
<h:head>
<f:facet name="first">
<meta content='text/html; charset=UTF-8' http-equiv="Content-Type"/>
<title>ajax-call</title>
</f:facet>
</h:head>
<h:body>
<h:form id="checkStatusForm">
<h:inputText id="searchCheckInput"
value="#{itemWeb.searchString}">
</h:inputText>
<label>Search By Title..</label>
<br/>
<h:commandButton class="addButton"
id="checkStatusButtonListener"
value ="Check Status (Listener)"
actionListener="#{itemWeb.findItemListener}">
<f:ajax execute="checkStatusForm"
event="action"
render="statusLabel"/>
</h:commandButton>
<h:commandButton class="addButton"
id="checkStatusButton"
value ="Check Status"
action="#{itemWeb.findItem}">
<f:ajax execute="checkStatusForm"
event="action"
render="statusLabel"/>
</h:commandButton>
<br/>
<h:outputText id="statusLabel"
value ="#{itemWeb.foundItem.status}">
</h:outputText>
</h:form>
</h:body>
</f:view>
</html>
managedbean
package com.wittakarn.view;
import com.wittakarn.model.Item;
import java.io.Serializable;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ViewScoped;
import javax.faces.event.ActionEvent;
/**
*
* #author Wittakarn
*/
#ViewScoped
#ManagedBean(name = "itemWeb")
public class ItemWeb implements Serializable{
private String searchString;
private Item foundItem;
public ItemWeb(){
foundItem = new Item();
}
public String getSearchString() {
return searchString;
}
public void setSearchString(String searchString) {
this.searchString = searchString;
}
public Item getFoundItem() {
return foundItem;
}
public void setFoundItem(Item foundItem) {
this.foundItem = foundItem;
}
public void findItem(){
foundItem.setStatus("status A");
}
public void findItemListener(ActionEvent event){
foundItem.setStatus("status B");
}
}
domain
package com.wittakarn.model;
import java.io.Serializable;
/**
*
* #author Wittakarn
*/
public class Item implements Serializable{
private String status;
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
}
I want update subcomponent with id="two". Everything is working until i put form in another component like h:panelGrid.
<h:panelGroup id="one">
<h:panelGroup id="two">
<h:outputText value="#{testBean.num}"/>
</h:panelGroup>
</h:panelGroup>
<br/>
<h:panelGrid columns="1">
<h:form>
<p:commandButton value="update"
action="#{testBean.inc()}"
update=":one:two"
ajax="true"
/>
</h:form>
</h:panelGrid>
In this case i am getting:
SF1073: java.lang.IllegalArgumentException caught during processing of RENDER_RESPONSE 6 : UIComponent-ClientId=, Message=one
What is wrong ?
PS: update=":one" is works, but i dont want update whole "one" component.
Here is a full code.
xhtml page:
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://xmlns.jcp.org/jsf/html"
xmlns:p="http://primefaces.org/ui">
<h:head>
<title>Facelet Title</title>
</h:head>
<h:body>
<h:panelGroup id="one">
<h:panelGroup id="two">
<h:outputText value="#{testBean.num}"/>
</h:panelGroup>
</h:panelGroup>
<br/>
<h:panelGrid columns="1" id="table">
<h:form id="form">
<p:commandButton value="update"
action="#{testBean.inc()}"
update=":one:two"
ajax="true"
/>
</h:form>
<!-- .....another components .... -->
</h:panelGrid>
</h:body>
</html>
the bean:
#Named
#ViewScoped
public class TestBean implements Serializable{
private int num;
public void inc() {
System.out.println("inc");
num++;
}
public int getNum() {
return num;
}
public void setNum(int num) {
this.num = num;
}
}
This very unhelpful error is caused by your invalid update syntax: :one:two first tries to look up one as a NamingContainer (see Communications in JSF 2.0). If it finds the component, but it isn't a NamingContainer, it throws the exception you're seeing.
To fix this, simply specify the correct update value:
<p:commandButton value="update" action="#{testBean.inc()}"
update=":two" ajax="true" />
I am trying to insert a popup which has to be lazy-loaded when clicking a h:commandButton. I insert its content via ui:include. However the preRenderView method is not being fired and the PopupPageModel model property is not being initialized so I get a NullPointerException when trying to invoke the business logic method inside PopupPageController.
The idea is having separate Model/Controller beans for both pages involved but I am not sure this is the correct approach, so I would like to know other approaches or the correct way to implement mine.
Thanks in advance.
Invoking page:
<h:commandButton
value="#{msg['jsf.thisScreen.someText']}">
<f:param name="theParameter" value="#{InvokingScreenModel.theParameter}" />
<rich:componentControl target="myPopup" operation="show" />
</h:commandButton>
<rich:popupPanel id="myPopup" modal="true" resizeable="false" autosized="true"
onmaskclick="#{rich:component('myPopup')}.hide()">
<f:facet name="header">
<h:outputText value="#{msg['jsf.anotherScreen.someText']}" />
</f:facet>
<f:facet name="controls">
<h:outputLink value="#" onclick="#{rich:component('myPopup')}.hide(); return false;"></h:outputLink>
</f:facet>
<ui:include src="popupPage.xhtml" />
</rich:popupPanel>
Popup page:
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:rich="http://richfaces.org/rich"
xmlns:a4j="http://richfaces.org/a4j"
xmlns:c="http://java.sun.com/jsf/core">
<f:metadata>
<f:viewParam name="theParameter"
value="#{PopupPageModel.theParameter}" />
<f:event type="preRenderView"
listener="#{PopupPageController.initialize}" />
</f:metadata>
<h:form id="someForm">
//Some things here
</h:form>
</ui:composition>
Popup page controller
#Component("PopupPageController")
#Scope("request")
public class PopupPageController {
#Autowired
private PopupPageModel model;
#Autowired
private SomeService service;
public void initialize(){
if (!FacesContext.getCurrentInstance().isPostback()) {
//Change some model properties via service methods
}
}
public void doSomething() {
}
}
I've been struggling with this for several days and I've been unable to find a lazy-loading solution for the popup so I'm posting a solution I managed to do that doesn't include this feature just in case it's useful for someone.
Invoking page extract
<h:form>
<a4j:outputPanel id="stuffDetails">
//Some ajax-rendered tabs and accordions above the button
.....
.....
<a4j:commandButton
value="Open Popup"
actionListener="#{PopupController.someInitializationListenerMethod}"
oncomplete="#{rich:component('thePopup')}.show();"
render="formPopup">
</a4j:commandButton>
</a4j:outputPanel>
</h:form>
<rich:popupPanel id="thePopup" modal="true"
resizeable="false" autosized="true"
onmaskclick="#{rich:component('thePopup')}.hide();">
<f:facet name="header">
<h:outputText value="Some header here" />
</f:facet>
<f:facet name="controls">
<h:outputLink value="#"
onclick="#{rich:component('thePopup')}.hide(); return false;">
</h:outputLink>
</f:facet>
<h:form id="formPopup">
<ui:include src="popup.xhtml" />
</h:form>
</rich:popupPanel>
popup.xhtml
<?xml version="1.0" encoding="ISO-8859-1" standalone="yes" ?>
<html>
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:rich="http://richfaces.org/rich"
xmlns:a4j="http://richfaces.org/a4j"
xmlns:c="http://java.sun.com/jsf/core">
//Some controls shown inside the popup
......
......
<a4j:commandButton value="Process data and close popup"
actionListener="#{PopupController.someProcessingMethod}"
render=":stuffDetails :formPopup"
oncomplete="#{rich:component('thePopup')}.hide();" />
<h:commandButton value="Cancel"
onclick="#{rich:component('thePopup')}.hide(); return false;" />
</ui:composition>
</html>
The render=":stuffDetails :formPopup" in popup.xhtml is to avoid the infamous JSF spec issue 790 described by BalusC here and here.
Any suggestions welcome.
i have a SEAM 2 application and i have a strange situation. I'm developing with Eclipse Indigo, and i need to create a page with a grid where each row has a button that display a popup window with a list and you can choose one item of the list with a link and the value selected is shown in the row.
So i have this component:
#Name("paramContHome")
#Scope(ScopeType.CONVERSATION)
public class ParamContHome extends KubeDAO<ParametroSistema>{
private static final long serialVersionUID = 1L;
#In
private LoginUser loginUser;
#In(required=false,create=true)
private CuentaContHome cuentaContHome;
public void load(){
try{
setInstance(getEntityManager().find(ParametroSistema.class, prctId));
}catch (Exception e) {
clearInstance();
setInstance(new ParametroSistema());
}
}
public void selCuentaParam(ParametroSistema par) {
setSelParam(par);
cuentaContHome.getCuentasList();
}
public void setCuentaParam(CuentaContable cta) {
selParam.setValorNum(cta.getId().floatValue());
selParam.setSelObj(cta);
}
...
}
That contains the methods that i'm trying to call from xhtml page. This is the xhtml page:
<?xml version="1.0" encoding="iso-8859-1" ?>
<!DOCTYPE composition PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:s="http://jboss.com/products/seam/taglib"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:a="http://richfaces.org/a4j"
xmlns:rich="http://richfaces.org/rich"
xmlns:p="http://primefaces.prime.com.tr/ui"
template="/layout/templateKu.xhtml">
<ui:define name="body">
<rich:panel>
<f:facet name="header">#{app.paramact_head}</f:facet>
<rich:spacer height="20" />
<h:form id="formA">
<p:growl globalOnly="true" sticky="false" life="3000" />
<p:focus />
<a:queue name="q1" />
<rich:dataTable var="res" value="#{paramContHome.resultList}"
rendered="#{not empty paramContHome.resultList}" rows="10"
align="center" rowClasses="tableInfo1 tableInfo2"
headerClass="tablaHeader" footerClass="tableScroll">
<f:facet name="header">#{app.paramact_list}</f:facet>
<rich:column filterBy="#{res.nombre}" filterEvent="onkeyup">
<f:facet name="header">#{app.paramact_nombre}</f:facet>
<h:outputText value="#{res.nombre}" />
</rich:column>
<rich:column>
<f:facet name="header">#{app.transferencia_valornum}</f:facet>
<h:inputText value="#{res.selObj.nombre}" size="20" >
<a:support event="onblur" ajaxSingle="true" eventsQueue="q1" reRender="_table"/>
</h:inputText>
<a:commandButton ajaxSingle="true"
action="#{paramContHome.selCuentaParam(res)}" reRender="sCta"
onclick="#{rich:component('selCta')}.show();"
styleClass="modifyBtn" value=" " style="width:30px;">
</a:commandButton>
</rich:column>
<f:facet name="footer">
<rich:datascroller id="ds1" renderIfSinglePage="true" />
</f:facet>
</rich:dataTable>
</h:form>
</rich:panel>
<rich:modalPanel id="selCta" width="400" moveable="false" autosized="true" top="50px"
onbeforeshow="activeModal.setActiveModalPanel('selCta');">
<f:facet name="header">#{app.general_lov}</f:facet>
<f:facet name="controls">
<h:panelGroup>
<h:graphicImage value="/kubeImg/close.png" styleClass="closeBtn"
onclick="#{rich:component('selCta')}.hide();" />
</h:panelGroup>
</f:facet>
<s:div id="sCta"><ui:include src="selCta.xhtml" /></s:div>
</rich:modalPanel>
</ui:define>
</ui:composition>
This is the button where i wanna call the method selCuentaParam of component paramContHome:
<rich:column>
<f:facet name="header">#{app.transferencia_valornum}</f:facet>
<h:inputText value="#{res.selObj.nombre}" size="20" >
<a:support event="onblur" ajaxSingle="true" eventsQueue="q1" reRender="_table"/>
</h:inputText>
<a:commandButton ajaxSingle="true"
action="#{paramContHome.selCuentaParam(res)}" reRender="sCta"
onclick="#{rich:component('selCta')}.show();"
styleClass="modifyBtn" value=" " style="width:30px;">
</a:commandButton>
</rich:column>
Inside this method, i call a method from another component, cuentaContHome:
#In(required=false,create=true)
private CuentaContHome cuentaContHome;
...
public void selCuentaParam(ParametroSistema par) {
setSelParam(par);
cuentaContHome.getCuentasList();
}
But when i run the application and enter to the page, and i press the button, it doesn't calle the method selCuentaParam. I've checked this because i put breakpoints inside it and put System.out.println and doesn't invoke it. Do you know why this happens, is something related to component initialization?
Regards.
Well, i found the problem, i think. In my screens i follow a certain pattern: First i have a xhtml where i show a grid of database records with a button to go to a second xhtml wich has a form to create a new record. This button begins a conversation, so in the xhtml that has a form (i call it detail.xhtml) it begins the conversation or joins to existing one. So, i modified the pages.xml of the first xhtml (i call it list.xhtml) in the next way:
<?xml version="1.0" encoding="UTF-8"?>
<page xmlns="http://jboss.com/products/seam/pages"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jboss.com/products/seam/pages http://jboss.com/products/seam/pages-2.2.xsd">
<action execute="#{paramContHome.getParametrosContables()}" on-postback="false"/>
<begin-conversation propagation="begin" join="true" />
</page>
I used first just <begin-conversation /> and but it gives me this exception begin() called from long-running conversation, try join=true so i added this to begin-conversation and it works!!