有条件地呈现非JSF组件（普通香草HTML和模板文本） [英] Conditional rendering of non-JSF components (plain vanilla HTML and template text)

问题描述

我试图有条件地呈现< tr> ，因此我无法使用< h：panelGroup> ，因为它会呈现为< span>或< div>

我目前的（工作）方法如下：

 < h：outputFormat rendered =＃{negotiator.maySend}> 
< tr>我的东西< / tr> 
< / h：outputFormat> 
  

这有效，但我不确定是否滥用 < h：outputFormat> - 在此之前，我使用了< h：outputLabel> ，但是这被呈现为<标签> 在IE中。

我也读过这个问题的答案，但正如上面提到的，他们不会为我工作， < tr> ：如何不在JSF中渲染整个块？ em>我无法使用< h：panelGroup> ，因为它会呈现为< span> 或<$ c



$ p $显然你没有仔细测试它。 < h：panelGroup> 将不会呈现任何内容，如果您没有指定最终会出现在客户端的属性，如 layout ， id ， styleClass 等。

<因此，这应该在技术上完全正常工作。

 < h：panelGroup rendered =＃{negotiator.maySend} > 
< tr>我的东西< / tr> 
< / h：panelGroup> 
  

然而，更好的主要目的是使用 < ui：fragment> $ b

 < ui：fragment rendered =＃{negotiator.maySend}> 
< tr>我的东西< / tr> 
< / ui：fragment> 
  

这也可以通过 < f：verbatim> ，但自从JSF 2.0专门为JSP中的使用而设计以来，这已被弃用。

另见：

• 替代ui：JSF中的片段


• 有条件地显示JSF组件


• 如何找到ajax update / render组件的客户端ID？找不到具有表达式foo的组件引用自bar


• 
  

在组件的哪个已经呈现的属性上> Ajax更新/渲染不起作用

I'm trying to conditionally render a <tr> therefore I cannot use <h:panelGroup> as it will render to <span> or <div>

My current (working) approach is the following:

<h:outputFormat rendered="#{negotiator.maySend}">
    <tr> my tr stuff </tr>
</h:outputFormat>

This works, but I'm not sure if that's the way to abuse <h:outputFormat> - before that I used <h:outputLabel> but this was rendered to <label> in IE.

I have also read the answers to this question, but as mentioned above, they won't work for me because of the <tr>: How to not render whole block in JSF?

解决方案

I cannot use <h:panelGroup> as it will render to <span> or <div>

Apparently you didn't test it carefully. The <h:panelGroup> won't render anything if you don't specify attributes which should end up in the client side, like layout, id, styleClass, etc.

Thus, this should technically perfectly work fine.

<h:panelGroup rendered="#{negotiator.maySend}">
    <tr> my tr stuff </tr>
</h:panelGroup>

However, better for the main purpose would be to use <ui:fragment>.

<ui:fragment rendered="#{negotiator.maySend}">
    <tr> my tr stuff </tr>
</ui:fragment>

This is by the way also possible with <f:verbatim>, but this is deprecated since JSF 2.0 as it's designed specifically for usage in JSP.

See also:

• Alternative to ui:fragment in JSF
• Conditionally displaying JSF components
• How to find out client ID of component for ajax update/render? Cannot find component with expression "foo" referenced from "bar"
• Ajax update/render does not work on a component which has rendered attribute

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