我是新来的JSF，Primefaces和Ajax，所以我想要做的就是更新一个面板，如果在我的背上豆验证为真，并更新另一个面板时，它是假的。

I'm new to JSF, Primefaces and Ajax, so what i'm trying to do is update one panel if a validation on my back bean is true and update another panel when it's false.

<h:panelGroup id="panel1">
    ...
    <h:commandButton id="btn1" action="#{bean.validate}">
        <p:ajax process="panel1" update="panel1"/>
    </h:commandButton>
</h:panelGroup>

<h:panelGroup id="panel2">
    ...
</h:panelGroup>

返回豆：

public void validate() {
    ...
    if(validatecondition) {
        // Update panel 1
    } else {
        // update panel 2
    }
}

所以是有可能做到这一点使用AJAX？在此先感谢！

So is it possible to do this using ajax? Thanks in advance!!

推荐答案

当然，两种方式。由于您使用primefaces，两个选项更容易将

Sure, two ways. Since you're using primefaces, the easier of two options would be

使用的RequestContext 反对选择性地更新面板。您的code将是这样的：

Use the RequestContext object to update the panels selectively. Your code will look like this:

 public void validate() {
   RequestContext context = RequestContext.getCurrentInstance();
   if(validatecondition) {
     context.update("panel1");
   } else {
     context.update("panel2");
   }
}

JSF PartialViewContext可以做同样的工作，有一点点打字

JSF PartialViewContext can do the same job, with just a little more typing

FacesContext ctxt = FacesContext.getCurrentInstance(); //get your hands on the current request context
     if(validatecondition) {
         ctxt.getPartialViewContext().getRenderIds().add("panel1");
       } else {
         ctxt.getPartialViewContext().getRenderIds().add("panel2");
       }

在 getRenderIds（）调用返回组件ID的JSF将通过AJAX更新响应完成的列表。这基本上是的RequestContext 在primefaces将引擎盖下做的。

The getRenderIds() call returns a list of component Ids that JSF will update via ajax on completion of the response. This is basically what RequestContext in primefaces will do under the hood.