如何在h:selectOneMenu中执行值变化转换?

时间:2011-02-01 07:51:30

标签: jsf-2 spring-webflow-2

通常我会做类似下面的事情。单击按钮执行转换。

<!-- view -->
<h:form>
  <h:commandButton action="doit">
    <f:ajax render="@form"/>
  </h:commandButton>
</h:form>

<!-- flow -->
<transition on="doit">...</transition>

如何在(例如)h:selectOneMenu?

中触发更改值的转换
<h:form>
  <h:selectOneMenu value="#{selected}">
    <f:selectItems value="#{items}/>
    <f:ajax event="valueChange" render="@form" />
  </h:selectOneMenu>
</h:form>


修改 我考虑过将注册表注册到f:ajax并准备webflow事件,但是如何使用该事件......?有人帮忙吗?

<h:form>
  <h:selectOneMenu value="#{selected}">
    <f:selectItems value="#{items}/>
    <f:ajax event="valueChange" render="@form" listener="#{bean.changeListener}" />
  </h:selectOneMenu>
</h:form>

的java:

import javax.faces.event.AjaxBehaviorEvent;
import org.springframework.webflow.execution.Event;

public class Bean {
     public void changeListener(AjaxBehaviorEvent event) {
         // prepare webflow event
         Event e = new Event(event.getSource(), "doit");
         // propagate this event... ???
     }
}

1 个答案:

答案 0 :(得分:4)

我最近遇到了类似的问题,并使用类似的侦听器样式处理primefaces / richfaces事件。这是一个例子:

    public void changeListener(AjaxBehaviorEvent event) {  
    RequestContext requestContext = RequestContextHolder.getRequestContext();
    RequestControlContext rec = (RequestControlContext) requestContext;
    //place variables you need in next flow phase here; flash,application,session scope
    rec.getFlashScope().put("someVarIneedInNextFlow", varName);
    rec.handleEvent(new Event(this, "flow transition name here, i.e. next-stage"));
    return;
}

那应该转换到你想要的任何流动事件:)