I've two session scoped beans I need to pass values between them through f:setPropertyActionListener but I cant read it from receivable end.
<p:selectOneListbox style="height: 100%; width: 100%" id="lstSubject" required="true" requiredMessage="Please select any Subject"
value="#{chooseSubExamManagedBean.subId}" >
<f:selectItems value="#{chooseSubExamManagedBean.mapSubjects}" />
</p:selectOneListbox>
user chooses the subject and I've to pass this id from p:command button to another bean
<p:commandButton id="cmdProceed" value="Proceed" action="#{chooseSubExamManagedBean.gotoFillMarks}" >
<f:setPropertyActionListener target="#{fillMarksManagedBean.subId}" value="#{chooseSubExamManagedBean.subId}" />
</p:commandButton>
the managed bean fillMarksManagedBean
#Named(value = "fillMarksManagedBean")
#javax.enterprise.context.SessionScoped
public class FillMarksManagedBean implements Serializable{
private int SubId;
private String ExamDetail;
public void setSubId(int SubId) {
this.SubId = SubId;
}
public int getSubExamId() {
return SubExamId;
}
and use that subId in
#PostConstruct
public void init() {
ExamDetail = clsFillMarks.getExamDetail(SubId);
}
...
How do i do this?
Thanks in advance
I have 3 managebean one model and 2 controllers (1 for the popup text) i want a popup after i insert into the database.
my page is like this the problem is that when i call for mensaje.mostrar() i works but when i try to call cursoControlador.registrarCurso() and from there try to call mensaje.mostrar() that changes the value from mostrarMensaje (boolean) don't show the popup.
<ui:define name="centro">
<h:form>
<h:panelGrid columns="3" cellpadding="5">
<p:outputLabel value="Nombre" />
<p:inputText value="#{cursoModelo.nombre}"/>
this is the button use and works fine
<p:commandButton action="#{mesaje.mostrar()}" value="Registrar Curso" >
<f:ajax render="#form"/>
</p:commandButton>
and this is the behavior i want
<p:commandButton action="#{cursoControlador.registrarCurso()}" value="Registrar Curso" >
<f:ajax render="#form"/>
</p:commandButton>
and this is the popup message i want to show
</h:panelGrid>
<h:panelGroup layout="block" styleClass="fondo-popup" rendered="#{mensaje.mostrarMensaje}">
<div class="panel-popup">
<p:outputLabel value="#{mensaje.texto}"/>
<h:commandButton value="Aceptar" action="#{mensaje.esconder()}">
<f:ajax render="#form"/>
</h:commandButton>
</div>
</h:panelGroup>
</h:form>
</ui:define>
model
#Named(value = "cursoModelo")
#SessionScoped
public class CursoModelo implements Serializable {
private String nombre;
//getters and setters...
}
controller 1
#Named(value = "cursoControlador")
#SessionScoped
public class CursoControlador implements Serializable{
#Inject private CursoModelo cursoModelo;
#Inject private Mensaje mensaje;
/**
* Creates a new instance of CursoControlador
*/
public CursoControlador() {
}
public String registrarCurso(){
//SOME CODE that inserts into de database
mensaje.mostrar(); //this is the problem probably i'm doing it wrong
return "index";
}
}
controller 2 (The controller for the message)
#Named(value = "mensaje")
#SessionScoped
public class Mensaje implements Serializable {
private String texto;
private boolean mostrarMensaje;
/**
* Creates a new instance of Mensaje
*/
public Mensaje() {
texto = "Mensaje a mostrar";
mostrarMensaje = false;
}
public void mostrar(){
mostrarMensaje = true;
}
public void esconder(){
mostrarMensaje = false;
}
//getters and setters from texto and mostrarMensaje
}
I trying to use a selectOneMenu ajax listener but its not working when my page receives parameters.
In my tests I used the same example shown in PrimeFaces ShowCase page, but my page also receives parameters by viewParam and viewAction.
The first time the selectOneMenu is changed the action listener is triggered, and then it stops working.
My 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:f="http://xmlns.jcp.org/jsf/core"
xmlns:p="http://primefaces.org/ui">
<h:head>
<title>Facelet Title</title>
</h:head>
<f:metadata>
<f:viewParam name="id" value="#{dropdownViewBean.id}" required="true" />
<f:viewAction action="#{dropdownViewBean.init}" />
</f:metadata>
<h:body>
<h:form>
<p:growl id="msgs" showDetail="true" />
<p:panel header="Select a Location" style="margin-bottom:10px;">
<h:panelGrid columns="2" cellpadding="5">
<p:outputLabel for="country" value="Country: " />
<p:selectOneMenu id="country" value="#{dropdownViewBean.country}" style="width:150px">
<p:ajax listener="#{dropdownViewBean.onCountryChange}" update="city" />
<f:selectItem itemLabel="Select Country" itemValue="" noSelectionOption="true" />
<f:selectItems value="#{dropdownViewBean.countries}" />
</p:selectOneMenu>
<p:outputLabel for="city" value="City: " />
<p:selectOneMenu id="city" value="#{dropdownViewBean.city}" style="width:150px">
<f:selectItem itemLabel="Select City" itemValue="" noSelectionOption="true" />
<f:selectItems value="#{dropdownViewBean.cities}" />
</p:selectOneMenu>
</h:panelGrid>
<p:separator />
<p:commandButton value="Submit" update="msgs" actionListener="#{dropdownViewBean.displayLocation}" icon="ui-icon-check" />
</p:panel>
</h:form>
</h:body>
</html>
And the bean:
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
import javax.faces.view.ViewScoped;
import javax.inject.Named;
#Named(value = "dropdownViewBean")
#ViewScoped
public class DropdownViewBean implements Serializable {
private Map<String, Map<String, String>> data = new HashMap<String, Map<String, String>>();
private String country;
private String city;
private Map<String, String> countries;
private Map<String, String> cities;
private int id;
public DropdownViewBean() {
}
public void init() {
System.out.println("init id=" + id); // message is correctly shown when page starts
countries = new HashMap<String, String>();
countries.put("USA", "USA");
countries.put("Germany", "Germany");
countries.put("Brazil", "Brazil");
Map<String, String> map = new HashMap<String, String>();
map.put("New York", "New York");
map.put("San Francisco", "San Francisco");
map.put("Denver", "Denver");
data.put("USA", map);
map = new HashMap<String, String>();
map.put("Berlin", "Berlin");
map.put("Munich", "Munich");
map.put("Frankfurt", "Frankfurt");
data.put("Germany", map);
map = new HashMap<String, String>();
map.put("Sao Paolo", "Sao Paolo");
map.put("Rio de Janerio", "Rio de Janerio");
map.put("Salvador", "Salvador");
data.put("Brazil", map);
}
public Map<String, Map<String, String>> getData() {
return data;
}
public String getCountry() {
return country;
}
public void setCountry(String country) {
this.country = country;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public Map<String, String> getCountries() {
return countries;
}
public Map<String, String> getCities() {
return cities;
}
public void onCountryChange() {
System.out.println("change"); // message is shown only the first time the combo is changed
if (country != null && !country.equals("")) {
cities = data.get(country);
} else {
cities = new HashMap<String, String>();
}
}
public void displayLocation() {
FacesMessage msg;
if (city != null && country != null) {
msg = new FacesMessage("Selected", city + " of " + country);
} else {
msg = new FacesMessage(FacesMessage.SEVERITY_ERROR, "Invalid", "City is not selected.");
}
FacesContext.getCurrentInstance().addMessage(null, msg);
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
}
Important:
If I took out the metadata, viewParam and viewAction tags and mark the init() method with #PostConstruct then the sample works perfectly, but I need the page parameter.
I ask your help to solve it.
I have my distrust of the javax.faces.view.ViewScoped, I've just been too lazy to file an issue. For one thing, you don't have to use that type of ViewScoped yet; it was introduced to lead to the eventual deprecation of javax.faces.bean.ViewScoped. As at now, it's still very valid and just as applicable.
The only restriction on that annotation is that it's not applicable to a CDI bean and it's the only viewscope that will allow the #Inject annotation. It doesn't appear you're in need of it, so you should be able to safely remove it.
You can still pull the GET parameters from within your #PostConstruct, old school:
#PostConstruct
public void init(){
FacesContext ctxt = FacesContext.getCurrentInstance();
Map<String,String> requestParameters = ctxt.getExternalContext().getRequestParameterMap();
int id = Integer.parseInt(requestParameters.get("id"));
}
I had the same problem as you.
Replace the tag
<f:viewParam name="id" value="#{dropdownViewBean.id}" required="true" />
With
<f:viewParam name="id" value="#{dropdownViewBean.id}"/>
Unfortunately I don't have an explanation about this Bug
I am learning JavaEE and I am playing around with ajax call with jsf and managedbean. I am trying to display the text as soon as i change the value from the drop down list. I see many people have the same problem on stackoverflow and i try to follow answers that are marked as accepted but I still can't make it work. Can someone please tell me where my error is?
Here is the jsf code:
<h:form>
<h:selectOneMenu id="productlist" value="#{productRepoMB.selectedProduct}">
<f:selectItems value="#{productRepoMB.productList}" var="product" itemValue="#{product.productID}" />
<f:ajax event="valueChange"
render="result"
listener="#{productRepoMB.selectMenuListener}" />
</h:selectOneMenu>
text changed: <h:outputText id="result" value="#{productRepoMB.text}" />
</h:form>
Here is managed bean code, Products list is populated from a database:
#Named
#RequestScoped
public class ProductRepoMB implements Serializable {
#EJB
private ProductsRepo productRepo;
private Products selectedProduct;
private List<Products> productList;
private String text="init text"; //use for testing ajax call
public ProductRepoMB() {
}
public Products getSelectedProduct() {
return selectedProduct;
}
public List<Products> getProductList() {
productList = productRepo.findAll();
return productList;
}
//The following code are used to testing ajax only!
public void selectMenuListener(AjaxBehaviorEvent e) {
setText("changed!");
}
public String getText() {
return text;
}
public void setText(String text){
this.text = text;
}
}
I have 2 SelectOneMenu as follows in the index.xhtml. The menu1 essentially chooses a language(sp or en) and menu2 displays the possible serial numbers(0 to 3). I have the init constructor(post constructor) which initialises the default values on the two Menus. However for some strange reason, if I select a serial number other than the default serial number for the language other than the default language, somehow the language gets reset to init default :(
<?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://java.sun.com/jsf/html"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:f="http://java.sun.com/jsf/core">
<h:head>
<title>My page</title>
</h:head>
<h:body>
<div>
<h4>Change Existing Description</h4>
</div>
<h:form id="myForm">
<h:panelGrid columns="4">
<h:outputLabel value="Language:" />
<h:selectOneMenu value="#{myBean.language}">
<f:selectItems value="#{myBean.languages}" />
<f:ajax listener="#{myBean.doUpdate}" render ="myForm" />
</h:selectOneMenu>
<h:outputLabel value="SerialID:" />
<h:selectOneMenu value="#{myBean.serialID}">
<f:selectItems value="#{myBean.serialIDs}" />
<f:ajax listener="#{myBean.doUpdate}" render ="myForm" />
</h:selectOneMenu>
</h:panelGrid>
</h:form>
</h:body>
</html>
Here is my Bean code. Where is the problem?? please advise!
package bean;
import java.util.ArrayList;
import java.util.List;
import javax.annotation.PostConstruct;
import javax.ejb.Stateful;
import javax.enterprise.context.RequestScoped;
import javax.faces.bean.ManagedBean;
#ManagedBean(name = "myBean")
//#Stateless
#Stateful
#RequestScoped
public class MyBean {
public static final int PERMISSIONS = 2;
private List<String> languages;
private String language;
private int serialID;
private List<Integer> serialIDs;
/**
* init() method for initializing the bean. Is called after constuction.
*/
#PostConstruct
private void init() {
//public MyBean () {
languages = getAllLanguages();
language = "en"; //defaultLanguage
serialID = 3;
serialIDs = getSerialIDsFromOverview();
}
public List<String> getLanguages() {
System.out.println("getLanguages, language " +language);
return languages;
}
public int getPERMISSIONS() {
return PERMISSIONS;
}
public String getLanguage() {
System.out.println("getLanguage " +language);
return language;
}
public void setLanguage(String language) {
System.out.println("setLanguage " +language);
this.language = language;
}
public int getSerialID() {
System.out.println("getSerialID " +serialID);
return serialID;
}
public void setSerialID(int serialID) {
System.out.println("setSerialID " +serialID);
this.serialID = serialID;
}
public List<Integer> getSerialIDs() {
System.out.println("getSerialIDs language = "+language );
return serialIDs;
}
public List<String> getAllLanguages() {
List<String> results = new ArrayList<String>();
results.add("sp");
results.add("en");
if(results != null){
System.out.println("getting all languages");
}
return results;
}
public void doUpdate() {
System.out.println("doUpdate language " +language);
System.out.println("doUpdate serialID " +serialID);
}
/**
* Returns a list of all serialIDs present in the overview.
* #return
*/
private List<Integer> getSerialIDsFromOverview() {
List<Integer> results = new ArrayList<Integer>();
results.add(0);
results.add(1);
results.add(2);
results.add(3);
return results;
}
}
UPDATES:
After taking suggestions from cubbuk, I sat down and corrected my code with #ViewScoped annotation and making the bean implement Serializable. THIS WORKS. However, the next thing I had to do was include an #EJB annotation to call a stateless bean which calls the Entity manager to fetch the serialIDs from a database instead of "hardcoding" it. That is when I encounter the problem: Not serializable exception "java.io.NotSerializableException: bean.__EJB31_Generated__. How do I solve this? When I made myBean back to RequestScope and remove Serializable, I could run the code without problems however there the toggling of the menu to init values :(
By the way I check this post: #EJB in #ViewScoped managed bean causes java.io.NotSerializableException and set my STATE SAVING METHOD to server but that gives me "empy response from server" pop up message :(
Please help!
Since you are using #RequestScoped bean as your backing bean after each request your init method is getting called and your values are getting reset. To avoid that you need to use #ViewScoped bean as your backing bean. I updated your bean accordingly note that your backing bean now implements Serializable interface. This is needed as this bean will be stored in your servlet and it needs to be flushed to disk if the content can not be hold in the memory. For learning the details of #ViewScoped beans please check the following post:
http://balusc.blogspot.com/2010/06/benefits-and-pitfalls-of-viewscoped.html
Apart from these, for naming conventions I renamed your getAllLanguages and getSerialIDsFromOverview methods to initAllLanguages and initSerialIds as methods starting with get and set can be confusing because they are mostly used for getters and setters.
Lastly when you use f:ajax command by default the UIInput the ajax command is bind to is rendered and executed. Since you don't refresh the h:selectOneMenu menus according to the values of each other you don't need to render the whole form. The following will be enough for this case:
<h:form id="myForm">
<h:panelGrid columns="4">
<h:outputLabel value="Language:" />
<h:selectOneMenu value="#{myBean.language}">
<f:selectItems value="#{myBean.languages}" />
<f:ajax listener="#{myBean.doUpdate}"/>
</h:selectOneMenu>
<h:outputLabel value="SerialID:" />
<h:selectOneMenu value="#{myBean.serialID}">
<f:selectItems value="#{myBean.serialIDs}" />
<f:ajax listener="#{myBean.doUpdate}"/>
</h:selectOneMenu>
</h:panelGrid>
</h:form>
#ManagedBean
#ViewScoped
public class MyBean implements Serializable
{
public static final int PERMISSIONS = 2;
private List<String> languages;
private String language;
private int serialID;
private List<Integer> serialIDs;
/**
* init() method for initializing the bean. Is called after constuction.
*/
#PostConstruct
protected void init()
{
//public MyBean () {
System.out.println("lang: " + language);
System.out.println("serialId: " + serialID);
System.out.println("init is called");
initAllLanguages();
initSerialIds();
language = "en"; //defaultLanguage
serialID = 3;
}
public List<String> getLanguages()
{
return languages;
}
public int getPERMISSIONS()
{
return PERMISSIONS;
}
public String getLanguage()
{
return language;
}
public void setLanguage(String language)
{
this.language = language;
}
public int getSerialID()
{
return serialID;
}
public void setSerialID(int serialID)
{
this.serialID = serialID;
}
public List<Integer> getSerialIDs()
{
return serialIDs;
}
private void initAllLanguages()
{
languages = new ArrayList<String>();
languages.add("sp");
languages.add("en");
}
public void doUpdate()
{
System.out.println("doUpdate language " + language);
System.out.println("doUpdate serialID " + serialID);
}
/**
* Returns a list of all serialIDs present in the overview.
*
* #return
*/
private void initSerialIds()
{
serialIDs = new ArrayList<Integer>();
serialIDs.add(0);
serialIDs.add(1);
serialIDs.add(2);
serialIDs.add(3);
}
}
Cheers