使用JSF在EL中用if-elseif-else表示 [英] The representation of if-elseif-else in EL using JSF
问题描述
以下JSF代码包含两个单独的<c:if></c:if>.我们来看一下.
The following JSF code contains two separate <c:if></c:if>. Let's look at it.
<?xml version='1.0' encoding='UTF-8' ?>
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:c="http://java.sun.com/jsp/jstl/core">
<h:head>
<title>JSF EL</title>
</h:head>
<h:body>
<h:form>
<c:set scope="request" var="row" property="x" value="10"/>
<c:if test="#{row==10}">
<h:outputLabel value="value = 10"/>
</c:if>
<c:if test="#{row==15}">
<h:outputLabel value="value = 15"/>
</c:if>
</h:form>
</h:body>
</html>
它仅在运行时在JSF页面上显示 value = 10 .我需要用以下if-elseif-else(Java上下文)来表示上述相同的<c:if></c:if>.
It simply displays value=10 on the JSF page at run time. I need to represent the above same <c:if></c:if> with the following if-elseif-else (Java context).
if(row.equals(10))
{
//Do something...(JSF stuff)
}
else if(row.equals(15))
{
//Do something...(JSF stuff)
}
else
{
//Do something...(JSF stuff)
}
如何使用JSF用表达式语言(EL)表示它?
How can it be represented with Expression Language (EL) using JSF?
推荐答案
以下代码是最简单的方法:
The following code the easiest way:
<h:outputLabel value="value = 10" rendered="#{row == 10}" />
<h:outputLabel value="value = 15" rendered="#{row == 15}" />
<h:outputLabel value="value xyz" rendered="#{row != 15 and row != 10}" />
用于EL表达式语法的链接. http://developers.sun.com/docs/jscreator /help/jsp-jsfel/jsf_expression_language_intro.html#syntax
Link for EL expression syntax. http://developers.sun.com/docs/jscreator/help/jsp-jsfel/jsf_expression_language_intro.html#syntax
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