【发布时间】：2014-04-22 14:42:50
【问题描述】：
我有一个问题，即<a4j:commandButton>actionListener 没有在服务器上被调用。我已经制作了我的真实代码的简化版本，并确认它证明了这个问题。
有人能解释一下为什么没有调用 actionListener 吗？
使用了 3 个文件：index.xhtml、MyManagedBean.java 和 MyEntity.java。以下是列表：
index.xhtml
<!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:a4j="http://richfaces.org/a4j"
xmlns:rich="http://richfaces.org/rich" xmlns:f="http://java.sun.com/jsf/core"
xmlns:ui="http://java.sun.com/jsf/facelets">
<f:metadata>
<f:event type="preRenderView" listener="#{myManagedBean.preRenderView}" />
</f:metadata>
<h:head>
<title>A simple example</title>
</h:head>
<h:body>
<rich:panel id="treePanel" header="Tree Panel">
<h:form>
<rich:tree var="entity" selectionType="ajax" selectionChangeListener="#{myManagedBean.onSelectionChanged}"
render="treePanel,editPopup">
<rich:treeModelAdaptor nodes="#{myManagedBean.someEntities}">
<rich:treeNode>
<h:outputText value="#{entity.someString}" />
</rich:treeNode>
</rich:treeModelAdaptor>
</rich:tree>
<a4j:commandButton value="Rename..." onclick="#{rich:component('editPopup')}.show()"
disabled="#{empty myManagedBean.selectedEntity}" />
</h:form>
</rich:panel>
<rich:popupPanel id="editPopup" modal="true" autosized="true" resizeable="false"
rendered="#{not empty myManagedBean.selectedEntity}" domElementAttachment="form">
<f:facet name="header">
<h:outputText value="Edit entity" />
</f:facet>
<h:form>
<h:panelGrid columns="2">
<h:outputLabel for="id" value="ID:" />
<h:outputText id="id" value="${myManagedBean.selectedEntity.id}" />
<h:outputLabel for="someString" value="Some string:" />
<h:inputText id="someString" value="${myManagedBean.selectedEntity.someString}"
validatorMessage="Alphanumerics and spaces only.">
<f:validateRegex pattern="^[ 0-9A-Za-z]*$" />
<rich:validator />
</h:inputText>
<h:outputText />
<rich:message for="someString" />
</h:panelGrid>
<a4j:commandButton actionListener="#{myManagedBean.updateSelectedEntity}" value="Update"
oncomplete="#{rich:component('editPopup')}.hide()" render="treePanel" />
<a4j:commandButton value="Cancel" onbegin="#{rich:component('editPopup')}.hide()" />
</h:form>
</rich:popupPanel>
</h:body>
</html>
MyManagedBean.java
package com.example.simple;
import java.util.ArrayList;
import java.util.List;
import javax.annotation.Resource;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceContextType;
import javax.persistence.TypedQuery;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Root;
import javax.transaction.HeuristicMixedException;
import javax.transaction.HeuristicRollbackException;
import javax.transaction.NotSupportedException;
import javax.transaction.RollbackException;
import javax.transaction.SystemException;
import javax.transaction.UserTransaction;
import org.richfaces.component.UITree;
import org.richfaces.event.TreeSelectionChangeEvent;
@ManagedBean
@SessionScoped
public class MyManagedBean {
private List<MyEntity> someEntities;
private MyEntity selectedEntity = null;
@PersistenceContext(type = PersistenceContextType.EXTENDED)
private EntityManager em;
@Resource
UserTransaction utx;
public void preRenderView() throws NotSupportedException, SystemException, SecurityException, IllegalStateException, RollbackException, HeuristicMixedException, HeuristicRollbackException {
System.out.println( "preRenderView executed" );
CriteriaBuilder cb = em.getCriteriaBuilder();
CriteriaQuery<MyEntity> cq = cb.createQuery( MyEntity.class );
Root<MyEntity> entity = cq.from( MyEntity.class );
cq.select( entity );
TypedQuery<MyEntity> q = em.createQuery( cq );
someEntities = q.getResultList();
if ( someEntities.isEmpty() ) {
utx.begin();
for ( int i = 0; i < 10; i++ ) {
MyEntity newEntity = new MyEntity();
newEntity.setSomeString( new StringBuilder( "Entity number " ).append( i ).toString() );
em.persist( newEntity );
someEntities.add( newEntity );
}
em.flush();
utx.commit();
}
}
public List<MyEntity> getSomeEntities() {
return someEntities;
}
public void setSomeEntities( List<MyEntity> someEntities ) {
this.someEntities = someEntities;
}
public MyEntity getSelectedEntity() {
return selectedEntity;
}
public void setSelectedEntity( MyEntity selectedEntity ) {
this.selectedEntity = selectedEntity;
}
public void onSelectionChanged( TreeSelectionChangeEvent event ) {
List<Object> selection = new ArrayList<Object>( event.getNewSelection() );
Object newSelectionKey = selection.get( 0 );
UITree tree = (UITree) event.getSource();
tree.setRowKey( newSelectionKey );
setSelectedEntity( (MyEntity) tree.getRowData() );
}
public void updateSelectedEntity() throws NotSupportedException, SystemException, SecurityException, IllegalStateException, RollbackException, HeuristicMixedException, HeuristicRollbackException {
utx.begin();
em.merge( selectedEntity );
em.flush();
utx.commit();
}
}
MyEntity.java
package com.example.simple;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
@Entity
public class MyEntity {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Integer id;
private String someString;
public Integer getId() {
return id;
}
public void setId( Integer id ) {
this.id = id;
}
public String getSomeString() {
return someString;
}
public void setSomeString( String someString ) {
this.someString = someString;
}
public String toString() {
return someString;
}
}
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标签： jakarta-ee richfaces