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Jstl c:when,c:choose,c:otherwise tag in jsp
Posted on: June 30, 2010 at 12:00 AM
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In this Section, we will discuss about how to use JSTL tag ' c:when ' in JSP with a simple example.

JSTL c:when,c:choose,c:otherwise TAGS IN JSP

In this Section, we will discuss about how to use JSTL tag ' c:when ' in JSP with a simple example.

Basically, the choose, when, and otherwise tags are used to construct an "c:if" statement. These are sub tags of "c:if" tag. The 'c:choose' is like the outermost braces of "if" control statement, 'c:when' is like the block of "if" control statement which executes when the condition is 'True' ,only one difference is that it(c:when) again checks the equality of expression/ value .And the 'c:otherwise' tag is like 'else' of "if " control statement of java.

Syntax : 

<c:if test="${ condition }">
<c:choose>
<c:when test="${
expression / value}">
<br />
</c:when>
<c:otherwise>
<br />
</c:otherwise>
</c:choose>

EXAMPLE : Given below example, which checks whether a number is even or odd :

CwhenJSTL.jsp

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

<html>

<body>

<form method="post"><center>

<font color="red"><b>Check even/odd Number</b></font>

<br><br>Enter a number:

<input type="text" name="enter" />

<input type="submit" value="Accept" />

<br /></center>

</form>

<center>

<c:if test="${pageContext.request.method=='POST'}">Entered value is:

<c:choose>

<c:when test="${param.enter%2==0}" >even.

<br />

</c:when>

<c:otherwise>odd.

<br />

</c:otherwise>

</c:choose>

</c:if>

</center>

</body>

</html>

OUTPUT :

After submitting value the output will be :

Download Source Code

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Posted on: June 30, 2010

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