在JSF中如何在EL内部使用HTML字符实体? | 在JSF中如何在EL内部使用HTML字符实体

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问题描述

我想在h:link组件的value属性中使用 em破折号.

I want to use the em dash in a value attribute for an h:link component.

这是我的尝试(目前无法正常工作):

Here is my attempt (currenctly not working):

<h:link value="#{somethingHere} &mdash; #{anotherHere}">
    <f:param name="identifier" value="#{somethingHere.identifier}" />
</h:link>

这将导致FaceletsException:

FaceletException: Error Parsing /index.xhtml: Error Traced[line: 13]
                The entity "mdash" was referenced, but not declared.
at com.sun.faces.facelets.compiler.SAXCompiler.doCompile(SAXCompiler.java:394)
...

我知道我可以改用HTML锚，但是有没有办法在EL表达式中使用它呢?正确的方法是什么?

I know I can use an HTML anchor instead, but is there a way to do it inside an EL expression? What is the correct way to do this?

推荐答案

Facelets是基于XML的，并由XML解析器进行处理. —是HTML实体，不能用XML识别.在此Wikipedia页面，"，&，'，<和>，可以用XML识别.

Facelets is XML based and processed by a XML parser. The — is a HTML entity and not recognized in XML. Only the five listed in this Wikipedia page, ", &, ', < and >, are recognized in XML.

Facelets/XML默认情况下已使用UTF-8，因此您只需将实际字符以纯文本/未编码的形式放置在模板中(前提是编辑器能够将文件另存为UTF-8).

Facelets/XML uses by default already UTF-8, so you could just put the actual character plain/unencoded in the template (provided that the editor is able to save the file as UTF-8).

<h:link value="#{somethingHere} — #{anotherHere}">

如果由于某种原因这不是一个选择，则可以改用&#nnnn;格式的数字字符引用，就像使用 表示XML中的 一样.您可以在fileformat.info中找到数字字符引用: Unicode字符'EM DASH'(U + 2014 )

If this isn't an option for some reason, then you could instead use a numeric character reference in the format &#nnnn;, like as one would use   to represent a   in XML. You can find the numeric character reference in fileformat.info: Unicode Character 'EM DASH' (U+2014)

所以，这应该为您做

<h:link value="#{somethingHere} &#8212; #{anotherHere}">

一种替代方法，应该更多地满足确切的错误消息，那就是在doctype中自己明确声明实体引用.

An alternative, which should satisfy the exact error message more, is to declare the entity reference explicitly yourself in the doctype.

<!DOCTYPE html [
    <!ENTITY mdash "&#8212;">
]>

但这不是一般的建议/方法，因为您需要在每个使用该字符的XML文件中重复此操作.

But this isn't the general recommendation/approach as you'd need to repeat this over every single XML file wherein the character is been used.

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