我已经找到this话题，哪里还有一点code。使用Ajax来加载一个div。 我试图建立这样的例子，但没有成功。

I have found this topic, where's a bit of code to reload a div using Ajax. I've tried creating such example, but not successfully.

下面是我的code：

的index.xhtml             

index.xhtml

        <h:form>
            <f:ajax render=":content">
                <h:commandButton value="News" action="#{navigationBean.requestPage}">
                    <f:param name="requestedPage" value="news.xhtml"/>
                </h:commandButton>
            </f:ajax>
            <br/><br/>
            <f:ajax render=":content">
                <h:commandButton value="News" action="#{navigationBean.requestPage}">
                    <f:param name="requestedPage" value="games.xhtml"/>
                </h:commandButton>
            </f:ajax>
        </h:form>

    </h:panelGroup>

    <h:panelGroup id="content" layout="block">
        <ui:include src="#{navigationBean.viewedPage}"/>
    </h:panelGroup>

支持bean

backing bean

@ManagedBean
@ViewScoped
public class NavigationBean
{
    private String viewedPage;

    public NavigationBean()
    {
        viewedPage = "news.xhtml";
    }

    public String getViewedPage()
    {
        return viewedPage;
    }

    public void setViewedPage(String viewedPage)
    {
        this.viewedPage = viewedPage;
    }

    public void requestPage()
    {
        Map<String,String> map = FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap();
        viewedPage = map.get("requestedPage");
    }
}

它的外观：

how it looks:

所以我缺少什么？可变viewedPage更新，正常的标签/文本等的更新，但无法获得该div的工作。

So what am I missing? Variable viewedPage is updated, normal labels/texts etc. are updated, but can't get this div working.

推荐答案

找到了解决办法：

<h:commandButton value="Games" action="#{navigationBean.requestPage}">
    <f:param name="requestedPage" value="games.xhtml"/>
    <f:ajax execute="@this" render="@none" />
    <f:ajax render=":content"/>
</h:commandButton>

加改变@ViewScoped到@SessionScoped。

plus changing @ViewScoped to @SessionScoped.