问题描述
我有一个取决于变量状态的onclick事件。所以我需要做类似的事情
I have an onclick event that depends on the state of a variable. So I need to do something like
onclick="#{object.isEnabled ? 'ch.my.js_method('#{object.property}'); return false;' : 'return false;'"
问题是,我不能在onclick中使用'
。如何逃避EL中的引号?
The problem is, that I can't use '
inside of the onclick. How can I escape the quotes inside of the EL?
推荐答案
您可以使用 \ 或
\\
,但每个EL实现的规则不同,因为EL规范不明确(Oracle的EL impl需要单反斜杠,但Apache需要双反斜杠)。你需要 + =
运算符来串联连接EL表达式。
You can escape them with \
or \\
, but rules differ per EL implementation, because it isn't clear cut in EL spec (Oracle's EL impl needs single backslash, but Apache needs double backslash). And you need the +=
operator to string-concatenate the EL expression.
<x:someComponent onclick="#{object.isEnabled ? 'ch.my.js_method(\'' += object.property += '\'); return false;' : 'return false;'}" />
最安全的做法是在< c:的帮助下创建一个别名:设置>
。
例如
<c:set var="js_method" value="ch.my.js_method('#{object.property}'); return false;" />
<x:someComponent onclick="#{object.isEnabled ? js_method : 'return false;'}" />
如果#{object.property},你仍然只是一个潜在的问题
可以包含JS特殊字符,这些字符又会导致无效的JS输出,例如单引号或换行符。前往第二个链接寻求解决方案。
You've only still a potential problem if #{object.property}
can contain JS-special characters which can in turn cause invalid JS output, such as single quotes or newlines. Head to the second link below for the solution to that.
- How to concatenate Strings in EL expression?
- How do I pass JSF managed bean properties to a JavaScript function?
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