如何将一个EL表达式与另一个EL表达式的结果进行比较 [英] How to compare an EL expression against the result of another EL expression

问题描述

我的Facelet中具有以下属性：

I have following attribute in my Facelet:

rendered="#{createTicketBaseBean.show == '#{I18N['key_please_select']}'}"

我正在尝试将属性文件中的值与属性进行比较，但出现以下错误：

I am trying to compare the value with property in my properties file, but I get following error:

错误解析：＃{createTicketBaseBean.show =='＃{I18N ['key_value_incident']}'' }`

Error Parsing: #{createTicketBaseBean.show == '#{I18N['key_value_incident']}'}`

但是当我将上述表达式替换为如下所示的硬编码值时：

But when I replace the above expression with a hard coded value like below:

rendered="#{createTicketBaseBean.show == 'incident'}"

然后工作正常。

推荐答案

这确实是无效的语法。您不能也不应嵌套EL表达式。您应该将＃{} 视为一个整体范围，变量之间可以相互交互。

This is indeed invalid syntax. You can't and shouldn't nest EL expressions. You should see the #{} as one whole scope where variables can interact with each other.

给出您想要的比较

createTicketBaseBean.show == I18N['key_please_select']

这是正确的语法：

rendered="#{createTicketBaseBean.show == I18N['key_please_select']}"

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