Jsf primefaces更新属性不起作用

每当我在Home.xhtml页面上运行以下代码时，就会出现以下异常。我试图用

id=items

调用面板的内容，但没有成功。它表示编译器找不到标识符为

项的组件

1） Home.xhtml的一部分

<h:form>
    <p:commandButton type="submit" value="Speak Out" action="#{statusBean.save}" ajax="true" styleClass="buttonstyle" update="items"/>                          
</h:form>


<p:panel id="items">    
    //content       
</p:panel>

好的，很快您应该尝试
：items
，因为它位于组件树之外。有关使用primefaces的ajax行为的更多详细信息，请查看showcase中的示例。此外，在这种情况下，您可以使用观察组件。
编辑：
在BalusC发出警告后，您的问题不在同一个组件树中，因为它不在同一个NamingContainer中

标准组件如
h:form
、
f:subview
和
h:dataTable
都是命名容器。大多数组件集都包含在一些命名容器中，因此在您的情况下，它位于标记之外，因此
：items
将是引用它的正确方式

请参阅以下文章，以帮助您更好地理解主题：




try:items，因为它在组件树之外。@berkay你应该发布一个答案：）@berkay谢谢它在工作，但是你能解释一下为什么它在组件树之外。@AmlanKarmakar更具体地说，它在
commandButton
触发的表单之外。您可能需要用另一个窗体包装面板。在这种情况下，更新将是
：formId:panelId
。如果您将
prependId
属性发送到false，则
panelId
前面将不会有
formId
@AmlanKarmakar请参见，它不在组件树之外。它在同一个组件树中，只是不在同一个
NamingContainer
中。请正确解释原因。
Mar 12, 2013 1:38:04 AM com.sun.faces.application.view.FaceletViewHandlingStrategy handleRenderException
SEVERE: Error Rendering View[/Home.xhtml]
javax.faces.FacesException: Cannot find component with identifier "items" in view.
    at org.primefaces.util.ComponentUtils.findClientIds(ComponentUtils.java:249)
    at org.primefaces.renderkit.CoreRenderer.buildAjaxRequest(CoreRenderer.java:222)
    at org.primefaces.component.commandbutton.CommandButtonRenderer.encodeMarkup(CommandButtonRenderer.java:81)
    at org.primefaces.component.commandbutton.CommandButtonRenderer.encodeEnd(CommandButtonRenderer.java:53)
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:879)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1650)
    at javax.faces.render.Renderer.encodeChildren(Renderer.java:164)
    at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:849)
    at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:300)
    at com.sun.faces.renderkit.html_basic.GridRenderer.renderRow(GridRenderer.java:181)
    at com.sun.faces.renderkit.html_basic.GridRenderer.encodeChildren(GridRenderer.java:125)
    at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:849)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1643)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1646)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1646)
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:389)
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:127)
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:117)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97)
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:135)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:309)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1001)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
    at java.lang.Thread.run(Thread.java:722)

Mar 12, 2013 1:38:04 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [Faces Servlet] in context with path [/FreeBird_v.6] threw exception [Cannot find component with identifier "items" in view.] with root cause
javax.faces.FacesException: Cannot find component with identifier "items" in view.
    at org.primefaces.util.ComponentUtils.findClientIds(ComponentUtils.java:249)
    at org.primefaces.renderkit.CoreRenderer.buildAjaxRequest(CoreRenderer.java:222)
    at org.primefaces.component.commandbutton.CommandButtonRenderer.encodeMarkup(CommandButtonRenderer.java:81)
    at org.primefaces.component.commandbutton.CommandButtonRenderer.encodeEnd(CommandButtonRenderer.java:53)
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:879)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1650)
    at javax.faces.render.Renderer.encodeChildren(Renderer.java:164)
    at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:849)
    at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:300)
    at com.sun.faces.renderkit.html_basic.GridRenderer.renderRow(GridRenderer.java:181)
    at com.sun.faces.renderkit.html_basic.GridRenderer.encodeChildren(GridRenderer.java:125)
    at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:849)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1643)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1646)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1646)
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:389)
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:127)
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:117)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97)
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:135)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:309)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1001)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
    at java.lang.Thread.run(Thread.java:722)