I am using Primefaces 3.4.2.
I have the following in my JSF page
<p:selectOneMenu id="emp" value="#{mymb.emp.employeeName}"
valueChangeListener="#{mymb.handleChange}"
required="true"
style="width: 150px;">
<f:selectItem noSelectionOption="true"
itemLabel="Please Select"/>
<f:selectItems value="#{mymb.employeeList}" var="emp"
itemLabel="#{emp.employeeName}"
itemValue="#{emp.employeeNumber}"/>
<p:ajax update="sublist"/>
</p:selectOneMenu>
and in ManagedBean
public void handleChange(ValueChangeEvent event){
System.out.println("here "+event.getNewValue());
}
The problem is valueChangeListener
is not firing, i.e. handleChange
method is not getting invoked. I tried with the following, but it is not working either.
<p:ajax update="sublist" listener="#{mymb.handleChange}" />
Separate JSF page:
<ui:composition template="/templates/layout.xhtml"
xmlns="http://www.w3.org/1999/xhtml"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:p="http://primefaces.org/ui">
<ui:define name="content">
<h:head>
</h:head>
<h:body>
<h:form id="form">
<p:panelGrid columns="6">
<h:outputLabel value="Employees" for="employees" />
<p:selectOneMenu id="employees"
value="#{mymb.employeesList}"
required="true">
<f:selectItems value="#{mymb.employeesList}" var="emp"
itemLabel="#{emp.employeeName}" />
<p:ajax listener="#{mymb.handleChange}" />
</p:selectOneMenu>
</p:panelGrid>
</h:form>
</h:body>
</ui:define>
</ui:composition>
This question is related to
jsf
jsf-2
primefaces
My problem were that we were using spring securyty, and the previous page doesn't call the page using faces-redirect=true, then the page show a java warning, and the control doesn't fire the change event.
Solution: The previous page must call the page using, faces-redirect=true
Try using p:ajax with event attribute,
<p:ajax listener="#{my.handleChange}" update="id of component that need to be rerender after change" process="@this" />
import javax.faces.component.UIOutput;
import javax.faces.event.AjaxBehaviorEvent;
public void handleChange(AjaxBehaviorEvent vce){
String name= (String) ((UIOutput) vce.getSource()).getValue();
}
this works for me:
It can be used inside the dialog, but the dialog canĀ“t be inside any componet such as panels, accordion, etc.
The valueChangeListener
is only necessary, if you are interested in both the old and the new value.
If you are only interested in the new value, the use of <p:ajax>
or <f:ajax>
is the better choice.
There are several possible reasons, why the ajax call won't work. First you should change the method signature of the handler method: drop the parameter. Then you can access your managed bean variable directly:
public void handleChange(){
System.out.println("here "+ getEmp().getEmployeeName());
}
At the time, the listener is called, the new value is already set. (Note that I implicitly assume that the el expression mymb.emp.employeeName
is correctly backed by the corresponding getter/setter methods.)
All can be defined as in f:ajax
attiributes.
i.e.
<p:selectOneMenu id="employees" value="#{mymb.employeesList}" required="true">
<f:selectItems value="#{mymb.employeesList}" var="emp" itemLabel="#{emp.employeeName}" />
<f:ajax event="valueChange" listener="#{mymb.handleChange}" execute="@this" render="@all" />
</p:selectOneMenu>
event: it can be normal DOM Events like click
, or valueChange
execute: This is a space separated list of client ids of components that will participate in the "execute" portion of the Request Processing Lifecycle.
render: The clientIds of components that will participate in the "render" portion of the Request Processing Lifecycle. After action done, you can define which components should be refresh. Id, IdList or these keywords can be added: @this
, @form
, @all
, @none
.
You can reache the whole attribute list by following link: http://docs.oracle.com/javaee/6/javaserverfaces/2.1/docs/vdldocs/facelets/f/ajax.html
Another solution is to mix valueChangeListener, ajax and process:
<p:selectManyCheckbox id="employees" value="#{employees}" columns="1" layout="grid" valueChangeListener="#{mybean.fireSelection}" >
<f:selectItems var="employee" value="#{employeesSI}" />
<p:ajax event="valueChange" immediate="true" process="@this"/>
</p:selectManyCheckbox>
Method in mybean is just :
public void fireSelection(ValueChangeEvent event) {
log.debug("New: "+event.getNewValue()+", Old: "+event.getOldValue());
}
Like this, valueChangeEvent is very light !
PS: Works fine with PrimeFaces 5.0
Source: Stackoverflow.com