如何使用依赖对象关系更新多个组件(selectOneMenu)？

Question

我有以下(不言自明的)实体关系:

* Manufacturer
* Car    (Manufacturer.getCars())
* Tire   (Car.getTires())

为myBean

private List<Manufacturer> allManufacturers

private Manufacturer selectedManufacturer
private Car selectedCar
private Tire selectedTire

XHTML

<p:selectOneMenu id="manufacturerSel" value="#{myBean.selectedManufacturer}" converter="#{manufacturerConverter}">
    <f:selectItem itemLabel="None" itemValue="#{null}" />
    <f:selectItems value="#{myBean.allManufacturers}" />
    <p:ajax update="carSel tireSel" />
</p:selectOneMenu>

<p:selectOneMenu id="carSel" value="#{myBean.selectedCar}" converter="#{carsConverter}" disabled="#{empty myBean.selectedManufacturer.cars}">
    <f:selectItem itemLabel="None" itemValue="#{null}" />
    <f:selectItems value="#{myBean.selectedManufacturer.cars}"  />
    <p:ajax update="tireSel" />
</p:selectOneMenu>

<p:selectOneMenu id="tireSel" value="#{myBean.selectedTire}" converter="#{tiresConverter}" disabled="#{empty myBean.selectedCar.tires}">
    <f:selectItem itemLabel="None" itemValue="#{null}" />                            
    <f:selectItems value="#{myBean.selectedCars.tires}"  />
</p:selectOneMenu>

• 最后两个p:selectOneMenu应该根据第一个中的选择进行更新
• p:selectOneMenu带ID 的最后一个tireSel没有正确更新
• 所有待更新的组件都在同一个内部 NamingContainer
• 将carSel被更新,但在加载的值tireSel很奇怪(似乎是最后的请求是有效的)
• 我也尝试update="@form"过manufacturerSel

编辑 显示使用的EL版本:以下是我的pom.xml的摘录

<dependency>
    <groupId>javax.faces</groupId>
    <artifactId>javax.faces-api</artifactId>
    <version>2.1</version>
</dependency>
<dependency>
    <groupId>org.glassfish</groupId>
    <artifactId>javax.faces</artifactId>
    <version>2.1.12</version>
</dependency>    
<dependency>
    <groupId>javax.el</groupId>
    <artifactId>el-api</artifactId>
    <version>2.2</version>
    <scope>provided</scope>
</dependency>

Answer 1

你基本上需要清除selectedCar价值.你可以用<p:ajax listener>它.

<p:ajax listener="#{myBean.clearSelectedCar}" update="carSel tireSel" />

同

public void clearSelectedCar() {
    selectedCar = null; // You might want to clear selectedTire as well.
}

否则旧的选定值仍将保留在豆中,轮胎列表仍将依赖于此.