JSTL XML <x:if> Tag

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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:

AttributeDescription RequiredDefault
selectThe XPath expression to be evaluatedYesNone
varName of the variable to store the condition's resultNoNone
scopeScope of the variable specified in the var attributeNoPage

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>

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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