Using JSF 2.1、Mojarra 2.1.3、Glassfish 3.1.1 和 PrimeFaces 3.3.1
我正在尝试在 JSF 中处理 preRenderView 事件上的处理字段级安全性,并且在需要将动态组件添加到 JSF 组件树时遇到问题。在第一次渲染时,一切都很好,并且处理了字段级安全性。但是,在任何类型的更新之后,Mojarra 会抱怨重复的 id,即使通过打印到控制台,我的添加代码每次更新只运行一次。
看起来 Mojarra 没有清除组件树以进行回发,因此每个后续呈现的更新都会将组件的附加版本添加到树中。
感谢任何人都可以提供的任何帮助。下面是一些愚蠢的示例代码。在命令按钮上,单击将引发错误。
索引.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"
xmlns:p="http://primefaces.org/ui"
>
<f:event listener="#{lifeCycle.event}" type="preRenderView" />
<h:body>
<h:form id="form" prependId="false">
<h:panelGroup id="testPanel">
<h:inputText id="viewSec" value="viewSec node"/><br/>
</h:panelGroup>
<p:commandButton update="testPanel"/>
</h:form>
</h:body>
</html>
生命周期.java:
package com.dynamic.test;
import java.io.Serializable;
import java.util.List;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import javax.faces.component.UIComponent;
import javax.faces.component.UIViewRoot;
import javax.faces.component.html.HtmlOutputText;
import javax.faces.component.visit.VisitContext;
import javax.faces.context.FacesContext;
import javax.faces.event.ComponentSystemEvent;
@ManagedBean
@RequestScoped
public class LifeCycle implements Serializable {
public void event(ComponentSystemEvent event){
FacesContext facesContext = FacesContext.getCurrentInstance();
UIViewRoot root = facesContext.getViewRoot();
NodeInspector visitCallback = new NodeInspector();
root.visitTree(VisitContext.createVisitContext(FacesContext.getCurrentInstance()), visitCallback);
List<UIComponent> securityEnabledComponents = visitCallback.getSecurityEnabledComponents();
for (UIComponent securityEnabledComponent : securityEnabledComponents) {
if(securityEnabledComponent.getClientId().equals("viewSec")){
List<UIComponent> childList = securityEnabledComponent.getParent().getChildren();
int targetPosition = securityEnabledComponent.getParent().getChildren().indexOf(securityEnabledComponent);
HtmlOutputText outputTextComponent = new HtmlOutputText();
outputTextComponent.setId(securityEnabledComponent.getId());
outputTextComponent.setValue(securityEnabledComponent.getAttributes().get("value"));
childList.set(targetPosition, outputTextComponent);
}
}
}
}
NodeInspector.java
package com.dynamic.test;
import java.util.ArrayList;
import java.util.List;
import javax.faces.component.UIComponent;
import javax.faces.component.visit.VisitCallback;
import javax.faces.component.visit.VisitContext;
import javax.faces.component.visit.VisitResult;
import javax.faces.context.FacesContext;
public class NodeInspector implements VisitCallback {
private List<UIComponent> securityEnabledComponents = new ArrayList<UIComponent>();
FacesContext facesContext = FacesContext.getCurrentInstance();
@Override
public VisitResult visit(final VisitContext context, final UIComponent target) {
if(target.getClientId().equals("viewSec")){
securityEnabledComponents.add(target);
}
return VisitResult.ACCEPT;
}
public List<UIComponent> getSecurityEnabledComponents() {
return securityEnabledComponents;
}
}
错误:
SEVERE: JSF1007: Duplicate component ID viewSec found in view.
... +id: j_idt2
type: <html xmlns="http://www.w3.org/1999/xhtml">
+id: j_idt3
type: javax.faces.component.UIOutput@17098e7
+id: form
type: javax.faces.component.html.HtmlForm@14677de
+id: testPanel
type: javax.faces.component.html.HtmlPanelGroup@167ab25
+id: viewSec <===============
type: javax.faces.component.html.HtmlOutputText@14a3d2e
+id: viewSec <===============
type: javax.faces.component.html.HtmlOutputText@f6a607
+id: j_idt4
type: <br/>
+id: j_idt5
type: org.primefaces.component.commandbutton.CommandButton@1380fc5
+id: j_idt6
type:
</html>...
SEVERE: Error Rendering View[/index.xhtml]
java.lang.IllegalStateException: Component ID viewSec has already been found in the view.
at com.sun.faces.util.Util.checkIdUniqueness(Util.java:821)...
检查您使用的Mojarra版本是否与Primefaces 3.3.1兼容。
使用最新版本的Primefaces 3.6。