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JSTL XML <x:if> Tag
The <x:if> tag evaluates a test XPath expression and if it is true, it processes its body. If the test condition is false, the body is ignored.
Attribute:
The <x:if> tag has following attributes:
Attribute | Description | Required | Default |
select | The XPath expression to be evaluated | Yes | None |
var | Name of the variable to store the condition's result | No | None |
scope | Scope of the variable specified in the var attribute | No | Page |
Example:
Following is an example to show you usage of <x:if> tag:
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="x" uri="http://java.sun.com/jsp/jstl/xml" %>
<html>
<head>
<title>JSTL x:if Tags</title>
</head>
<body>
<h3>Books Info:</h3>
<c:set var="xmltext">
<books>
<book>
<name>Padam History</name>
<author>ZARA</author>
<price>100</price>
</book>
<book>
<name>Great Mistry</name>
<author>NUHA</author>
<price>2000</price>
</book>
</books>
</c:set>
<x:parse xml="${xmltext}" var="output"/>
<x:if select="$output//book">
Document has at least one <book> element.
</x:if>
<br />
<x:if select="$output/books[1]/book/price > 100">
Book prices are very high
</x:if>
</body>
</html>
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Now let us try to access above JSP, this would produce following result:
Books Info:
Document has at least one <book> element.
Book prices are very high
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