JSF:h:outputText;值是空字符串时如何显示破折号? [英] JSF: h:outputText; how to show a dash when the value is empty string?

问题描述

我正在使用h:outputText标记来显示只读数据.例如:

I'm using h:outputText tags to display readonly data. Ex:

<h:outputText value="Phone Number:" />
<h:outputText value="#{userHandler.user.phoneNumber}" />

当"phoneNumber"为空字符串或空值时，我想显示破折号-"作为值.

When "phoneNumber" is an empty string or a null, I want to display a dash "-" as the value.

有没有简单的方法可以做到这一点，也许是用表达语言之类的?

Is there any easy way to do this maybe with expression language or something?

顺便说一句，我曾考虑过将诸如getPhoneNumberDisplayText()之类的方法添加到User类中，从而可以在内部进行检查，但是由于是视图问题，我宁愿将代码保留在JSF页面中.

BTW, I thought about adding methods to the User class like getPhoneNumberDisplayText() that could do the check internally, but I since it's a view issue, I'd rather keep the code in the JSF page.

推荐答案

<h:outputText value="#{userHandler.user.phoneNumber != null 
    ? userHandler.user.phoneNumber : '-'}" />

或者，您可以创建一个新的outputText:

Or, you could make a new outputText:

<h:outputText rendered="#{userHandler.user.phoneNumber == null}" value="-" />

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