如何使用< ui:repeat>遍历嵌套列表? [英] How to use <ui:repeat> to iterate over a nested list?

问题描述

使用JSF 2.0，我需要显示一个表格，其中每一行都包含一个打开弹出窗口的链接.我有两个模型:具有id和List<B>属性的A和具有id和name属性的B.在我的后备bean中，我有一个List<A>属性.在我看来，我正在使用<ui:repeat>遍历List<A>.

Using JSF 2.0, I need to display a table wherein each row contains a link which opens a popup. I have two models: A which has id and List<B> properties and B which has id and name properties. In my backing bean, I have a List<A> property. In my view, I am using <ui:repeat> to iterate over List<A>.

要求是，根据用户单击的行，需要显示相应的A.但是，<ui:repeat>不接受要在var属性中分配的嵌套列表.因此，我需要做很多效率不高的解决方法.

The requirement is, depending on the row that the user clicks, the corresponding List<B> of A needs to be displayed. However, the <ui:repeat> does not accept a nested list to be assigned in the var attribute. Hence, I need to do a lot of workarounds which is not efficient.

如何有效解决此问题?

推荐答案

您需要的是在外部迭代中嵌套另一个<ui:repeat>标签:

What you need is to nest another <ui:repeat> tag in your outer iteration:

<ui:repeat value="#{bean.listOfA}" var="a">
    ...
    <ui:repeat value="#{a.listOfB}" var="b">
        ...
    </ui:repeat>
</ui:repeat>

唯一值得注意的是，嵌套的<ui:repeat>标签曾经在Mojarra 2.1.15版本之前在状态管理方面存在问题(详细信息请参见

The only thing left that is worth noting is that nested <ui:repeat> tags used to have problems with state management until Mojarra 2.1.15 version (details in jsf listener not called inside nested ui:repeat and in many not so recent questions and their answers), which could result in action listeners not called, etc. but if you're currently on the latest Mojarra JSF implementation - just skip this part altogether.

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