如何从SelectOneMenu中的选定项更新JSF SelectManyListBox项？

Question

我有以下组件：

                     <h:selectOneMenu id="company" 
                                 value="#{companyController.selected.companyId}" 
                                 onchange="?????????">

                    <f:selectItems value="#{companyController.itemsAvailableSelectOne}"/>
                </h:selectOneMenu>

                <h:outputLabel value="some value" for="locations" />

                <h:selectManyListbox id="locations" >
                    <f:selectItems value="#{companyController.selected.locationCollection}"/>
                </h:selectManyListbox>

每次在SelectOneMenu中选择公司时，我都需要更新SelectManyListBox中的项目。

请帮帮我

非常感谢！

Answer 1

您将要使用<f:ajax>。也许是这样的：

            <h:selectOneMenu id="company" 
                             value="#{companyController.selected.companyId}">
                <f:ajax event="valueChange" execute="@this" render="@this locations" />
                <f:selectItems value="#{companyController.itemsAvailableSelectOne}"/>
            </h:selectOneMenu>

            <h:outputLabel value="some value" for="locations" />

            <h:selectManyListbox id="locations" >
                <f:selectItems value="#{companyController.selected.locationCollection}"/>
            </h:selectManyListbox>

然后，您可以修改selected对象setCompanyId方法以更新locationCollection：

public void setCompanyId( long companyId ) {
    this.companyId = companyId;
    // now update your location collection
    this.locationCollection = locationCollectionMap.get( companyId );
}