2

I have ap:selectOneMenu in my application, and when the selection takes place I need to call multiple back-end methods from different managed beans in order to perform different actions.

XHTML 代码:

<p:selectOneMenu id="selectMenu" value="#{userBean.selectedSite}"
  converter="siteConverter" style="width:150px">
  <p:ajax event="change" listener="#{bean2.changeSite}"
    render="@form :comp1 :comp2 :comp3 :comp4" />
  <f:selectItems value="#{userBean.sites}" var="site"
    itemValue="#{site}" itemLabel="#{site.description}" />
  <p:ajax event="change" listener="#{bean1.reset}" 
    update="@form :comp1 :comp2 :comp3 :comp4" />
</p:selectOneMenu>

托管 bean 1:

@ManagedBean(name="bean1")
@ViewScoped
public class Bean1 implements Serializable {
  // ...
  public void reset() {
    loadEvents();
    resetEvent();
  }
}

托管 bean 2:

@ManagedBean(name="bean2")
@SessionScoped
public class Bean2 implements Serializable {
  // ...
  public void changeSite() {
    FacesContext context = FacesContext.getCurrentInstance();
    Bean1 bean = (Bean1) context.getApplication().evaluateExpressionGet(context, "#{bean1}", Bean1.class);
    reload();
    bean.loadEvents();
  }
}

如果我不使用两个不同的 p:ajax 组件,而是使用从 Bean1 调用单个方法的单个 p:ajax,则“更新”下列出的页面组件不会正确更新。

XHTML:

<p:ajax event="change" listener="#{bean1.singleMethod}" 
  update="@form :comp1 :comp2 :comp3 :comp4" />

托管 bean 1:

@ManagedBean(name="bean1")
@ViewScoped
public class Bean1 implements Serializable {
  // ...
  public void () singleMethod() {
    FacesContext context = FacesContext.getCurrentInstance();
    Bean2 bean = (Bean2) context.getApplication().evaluateExpressionGet(context, "#{bean2}", Bean2.class);
    bean2.changeSite();
    reset();
  }
}

更改所选值会更新服务器端对象,但页面不会更新:如果我按 F5,页面会显示实际情况。

4

1 回答 1

0

将单个全局方法移动到会话范围的 bean (Bean2) 就可以完成这项工作。

于 2013-10-14T10:17:40.813 回答