JSTL XML x:if Tag

The <x: if> tag evaluates an XPath expression. If the result is true then the body of the tag is evaluated, otherwise not. It is used to check the conditional value.

Syntax of <x: if> Tag

[code lang=”html”]
<x: if attributes> body content </x: if>
[/code]

Attributes of <x: if> Tag

Attributes	Description
select	To evaluate the particular object it specifies xml Xpath expression.
var	It specifies the variable name which stores conditional result.
scope	The Scope into which the variable attribute has to be set.

Example

[code lang=”html”]
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="x" uri="http://java.sun.com/jsp/jstl/xml" %>

<h2>Fruits Information:</h2>

<c:set var="fruitss">

<fruit>
<name>Grapes</name>
<price>40</price>
</fruit>

<fruit>
<name>Orange</name>
<price>30</price>
</fruit>

<fruit>
<name>Apple</name>
<price>90</price>
</fruit>

</fruits>

</c:set>

<x:parse xml="${fruitss}" var="output"/>

<x:if select="$output/fruits/fruit/price < 100">
Fruits prices are very low
</x:if>

</body>
</html>
[/code]

Details of the Code

<c:set var=”fruitss”> tag is used to set the variable name which we want to display in the output.
<x:parse xml=”${fruitss}” var=”output”/> tag is used to parse the xml content and the result is been stored in specified variable.
<x:if select=”$output/fruits/fruit/price tag is used to test the condition.

Steps for Execution

Before executing the xml programs we should add jar files in eclipse namely:
xalan-2.7.0.jar

Save this file as example.jsp in your eclipse IDE.
Now select this jsp file, right mouse click and select Run as ->Run on server

Output

When the execution process is completed successfully we will get the following output :

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