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Can we have a switch statement in JSP for XPath expression?
The <x:choose> tag works like a Java switch statement. With this, you can choose between a number of alternatives. Where the switch statement has the case statements, the <x:choose> tag has the <x:when> tags. In a similar way, a switch statement has the default clause to specify a default action and the <x:choose> tag has the <x:otherwise> tag as the default clause.
Attribute
The <x:choose> tag does not have any attribute.
The <x:when> tag has one attributes which is listed below.
The <x:otherwise> tag does not have any attribute.
The <x:when> tag has the following attributes −
| Attribute | Description | Required | Default |
|---|---|---|---|
| select | Condition to evaluate | Yes | None |
Example
<%@ 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:choose 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 = "${xmltext}" var = "output"/>
<x:choose>
<x:when select = "$output//book/author = 'ZARA'">
Book is written by ZARA
</x:when>
<x:when select = "$output//book/author = 'NUHA'">
Book is written by NUHA
</x:when>
<x:otherwise>
Unknown author.
</x:otherwise>
</x:choose>
</body>
</html>
The following result will be displayed −
Books Info: Book is written by ZARA
Updated on: 2019-07-30T22:30:25+05:30
434 Views
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