如何使用outputText显示换行符? [英] How to display a line break with outputText?
问题描述
我需要使用outputText渲染换行符，以便可以利用属性rendered.我尝试过
I need to render a line break using outputText so that I can utilize the rendered attributed. I tried
<h:outputText value="<br/>" escape="false" />
但是它产生了异常
The value of attribute "value" associated with an element type "null" must not contain the '<' character.
推荐答案
自Facelets以来，这确实是无效的，因为它在XML上在语法上是无效的.您需要手动转义<，>等XML特殊字符.
That's indeed not valid since Facelets because it's syntactically invalid in XML. You'd need to manually escape the XML special characters like <, > and so on.
<h:outputText value="<br/>" escape="false" />
但是，您只需在模板文本中发出<br/>即可，而无需<h:outputText>.
You can however just emit the <br/> in template text without the need for a <h:outputText>.
<br/>
要有条件地进行渲染，请将其包装在例如<ui:fragment>中.
To render it conditionally, wrap it in for example a <ui:fragment>.
<ui:fragment rendered="#{bean.rendered}"><br /></ui:fragment>
<h:panelGroup>也有效，因为它仍然不会向HTML发出任何东西.
A <h:panelGroup> is also valid as it doesn't emit anything to the HTML anyway.
<h:panelGroup rendered="#{bean.rendered}"><br /></h:panelGroup>
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