在同一命名容器中重复使用facelets组合时，避免重复的id [英] Avoiding duplicate ids when reusing facelets compositions in the same naming container

问题描述

我有一个<ui:composition>，其中包含一些带有显式ID的元素和一些ajax事件，这些事件引用这些ID进行部分处理/更新.我只是将xhtml的这个片段封装在合成中，所以我可以在几个不同的地方使用它，而不必重复代码.但是，当我在页面中多次使用合成(<ui:include>)时，会出现重复的id异常.似乎JSF并未将每个合成都包装在其自己的命名容器中(就像<ui:component>一样).

I have a <ui:composition> that contains a few elements with explicit ids and some ajax events which reference these ids for partial processing/updating. I encapsulated this fragment of xhtml inside the composition simply so I could use it in a few different places without having to duplicate the code. However, when I use the composition (with <ui:include>) more than once inside a page, I get duplicate id exceptions. It seems JSF is not wrapping each composition inside its own naming container (like <ui:component> does).

有没有一种简单的方法可以将我的作品包装在其自己的命名容器中? 还是我每次想在通用命名容器内重用xhtml片段时都必须使用复合组件?

Is there a simple way to wrap my composition inside its own naming container? Or do I have to use a composite component every time I want to reuse xhtml fragments inside a common naming container?

推荐答案

根据<ui:include>模板的目的，您有几种选择:

Depending on the purpose of the <ui:include> template, you've several options:

1. 使用<f:subview>.它会创建另一个NamingContainer上下文(例如<h:form>，<h:dataTable>和朋友都可以这样做):

1. Use <f:subview>. It creates another NamingContainer context (like as <h:form>, <h:dataTable>, and friends all do):

<f:subview id="top">
    <ui:include src="/WEB-INF/includes/some.xhtml" />
</f:subview>
...
<f:subview id="bottom">
    <ui:include src="/WEB-INF/includes/some.xhtml" />
</f:subview>

在some.xhtml中定义的组件最终将在其ID中分别获得top:和bottom:前缀.

The components definied in some.xhtml will end up getting respectively top: and bottom: prefix in their ID.

将其转换为标记文件，该属性需要id属性.

Turn it into a tagfile which requires an id attribute.

<my:some id="top" />
...
<my:some id="bottom" />

并使用该ID在合成中添加组件ID的前缀.

And use that ID to prefix the ID of the components in the composition.

<ui:composition 
    xmlns="http://www.w3.org/1999/xhtml"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:ui="http://java.sun.com/jsf/facelets"
>
    ...
    <h:someComponent id="#{id}_some" />
    <h:otherComponent id="#{id}_other" />
    ...
<ui:composition>

---

将其转换为复合组件.复合组件本来就已经是NamingContainer，因此它们的id属性是可选的.基本上，替换

---

Turn it into a composite component. Composite components are inherently already a NamingContainer, so their id attribute is optional. Basically, replace

<ui:composition 
    xmlns="http://www.w3.org/1999/xhtml"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:ui="http://java.sun.com/jsf/facelets"
>
    ...
<ui:composition>

作者

<ui:component 
    xmlns="http://www.w3.org/1999/xhtml"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:cc="http://java.sun.com/jsf/composite"
>
    <cc:interface>
        <!-- This is optional. -->
    </cc:interface>
    <cc:implementation>
        ...
        <h:someComponent id="some" />
        <h:otherComponent id="other" />
        ...
    </cc:implementation>
<ui:component>

这样，您可以按以下方式使用它:

This way you can use it as follows:

<my:some id="top" />
...
<my:some id="bottom" />

在<cc:implementation>中定义的组件最终将在其ID中分别获得top:和bottom:前缀(再次注意，复合组件的id属性是可选的，否则JSF将自动生成一个).

The components definied in <cc:implementation> will end up getting respectively top: and bottom: prefix in their ID (note again, the composite component's id attribute is optional, JSF will otherwise autogenerate one).

另请参见:

• 何时使用< ui:include> ;、标记文件，复合组件和/或自定义组件?

See also:

• When to use <ui:include>, tag files, composite components and/or custom components?

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