我有以下(不言自明的)实体关系:
* Manufacturer
* Car (Manufacturer.getCars())
* Tire (Car.getTires())
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>
p:selectOneMenu
应该根据第一个中的选择进行更新 p:selectOneMenu
与 ID tireSel
未正确更新 NamingContainer
carSel
得到更新,但加载在 tireSel
中的值很奇怪(似乎对最后一个请求有效)update="@form"
在 manufacturerSel
编辑
要显示使用哪个 EL 版本:
这是我的 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>
最佳答案
你基本上需要清除selectedCar
值(value)。您可以使用 <p:ajax listener>
为了这。
<p:ajax listener="#{myBean.clearSelectedCar}" update="carSel tireSel" />
和
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 bean 中,并且轮胎列表仍将取决于该值。
关于jsf - 如何使用依赖对象关系更新多个组件(selectOneMenu)?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/13197385/