遍历集合时将动态ID分配给隐藏字段 [英] Assign dynamic ids to hidden fields when iterating over a collection

问题描述

是否可以将动态ID分配给h:inputHidden组件?

Is there a way to assign dynamic ids to h:inputHidden components?

EDIT1

在遍历元素集合时，我试图在ui:repeat标记内分配ID.

I am trying to assign the ids inside a ui:repeat tag when iterating over a collection of elements.

推荐答案

无法基于<ui:repeat>的迭代值设置ID.但是您仍然不需要它.默认情况下，他们将已基于迭代索引获得动态且唯一的ID.

It is not possible to set the ID based on the iteration value of an <ui:repeat>. But you don't need it anyway. They will by default already get dynamic and unique IDs based on the iteration index.

例如

<h:form id="form">
    <ui:repeat value="#{bean.list}" var="item">
        <h:inputHidden id="hidden" value="#{item.value}" />
    </ui:repeat>
</h:form>

将在视图渲染期间生成此HTML

will generate this HTML during view render time

<form id="form" name="form">
    <input type="hidden" id="form:0:hidden" name="form:0:hidden" value="item1value" />
    <input type="hidden" id="form:1:hidden" name="form:1:hidden" value="item2value" />
    <input type="hidden" id="form:2:hidden" name="form:2:hidden" value="item3value" />
</form>

如果要手动控制ID，则需要使用<c:forEach>，因为<ui:repeat>不会生成多个JSF组件，而是允许其子级(在上面是单个<h:inputHidden>例如)多次生成HTML. <c:forEach>将生成多个JSF组件，然后每个组件仅生成一次HTML(因此，您实际上在JSF组件树中最终拥有多个<h:inputHidden>组件).

If you want to manually control the ID, you'd need to use <c:forEach> instead, because <ui:repeat> doesn't generate multiple JSF components, but lets its children (which is a single <h:inputHidden> in the above example) generate HTML multiple times. The <c:forEach> will generate multiple JSF components which then each generate HTML only once (so you effectively end up with multiple <h:inputHidden> components in JSF component tree).

例如

<h:form id="form">
    <c:forEach items="#{bean.list}" var="item">
        <h:inputHidden id="#{item.id}" value="#{item.value}" />
    </c:forEach>
</h:form>

基本上将在视图构建期间生成此JSF组件树

which will basically generate this JSF component tree during view build time

<h:form id="form">
    <h:inputHidden id="item1id" value="#{bean.list[0].value}" />
    <h:inputHidden id="item2id" value="#{bean.list[1].value}" />
    <h:inputHidden id="item3id" value="#{bean.list[2].value}" />
</h:form>

这将在视图渲染期间生成此HTML

which in turn will generate this HTML during view render time

<form id="form" name="form">
    <input type="hidden" id="form:item1id" name="form:item1id" value="item1value" />
    <input type="hidden" id="form:item2id" name="form:item2id" value="item2value" />
    <input type="hidden" id="form:item3id" name="form:item3id" value="item3value" />
</form>

另请参见:

• JSF2 Facelets中的JSTL ...有意义吗?

See also:

• JSTL in JSF2 Facelets... makes sense?

这篇关于遍历集合时将动态ID分配给隐藏字段的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！