如何在 selectOneMenu 中对 selectItems 进行分组 [英] How to group selectItems in selectOneMenu

问题描述

我想使用 primefaces showcase 中的示例在 selectOneMenu 中对 selectItems 进行分组:

I would like to use the example from the primefaces showcase to group selectItems in selectOneMenu:

<h:outputText value="Grouping: " />  
    <p:selectOneMenu value="#{formBean.car}">  
        <f:selectItem itemLabel="Select One" itemValue="" />  
        <f:selectItems value="#{formBean.cars}" />  
    </p:selectOneMenu> 

我的问题是，没有实现 bean.现在不知道，如何在getCars()方法内部实现selectItems的分组.而且我找不到任何其他示例.

My problem is, that there is no implementation of the bean. Now I don't know, how to implement the grouping of the selectItems inside the method getCars(). And I can't find any other example.

推荐答案

showcase 的#{formBean} 的源代码可用 这里.以下是相关性的摘录:

The source code of the showcase's #{formBean} is available here. Here's an extract of relevance:

private List<SelectItem> cars;

public FormBean() {
    SelectItemGroup g1 = new SelectItemGroup("German Cars");
    g1.setSelectItems(new SelectItem[] {new SelectItem("BMW", "BMW"), new SelectItem("Mercedes", "Mercedes"), new SelectItem("Volkswagen", "Volkswagen")});

    SelectItemGroup g2 = new SelectItemGroup("American Cars");
    g2.setSelectItems(new SelectItem[] {new SelectItem("Chrysler", "Chrysler"), new SelectItem("GM", "GM"), new SelectItem("Ford", "Ford")});

    cars = new ArrayList<SelectItem>();
    cars.add(g1);
    cars.add(g2);
}

因此，您缺少的密钥是 SelectItemGroup.

Thus, your missing key is SelectItemGroup.

• 我们的selectOneMenu wiki 页面 - 动态群组列表"

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