JSTL c if Core Tag

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The JSTL <c:if> Core Tag is used in the control flow. It evaluates an expression and executes a specific block of code if the result returns true.

 

Syntax:

<c:if  test ="testCondition">
   //block of code 
</c:if>

 

c:if tag attributes:

Attribute Description Required
test It specifies the condition to evaluate. Yes
var It specifies the name of the variable to store the condition’s result. No
scope It specifies the scope of the variable to store the condition’s result. No

 

Example:

test.jsp

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
 
<html>
    <head>
        <title>c:if JSTL core tag example</title>
    </head>
    <body>
        <c:set var="num" value="100"/>
        <c:if test="${num > 0}">
            Num = <c:out value="${num}"/>
        </c:if>
    </body>
</html>

 

web.xml

<web-app>
 
  <welcome-file-list>
          <welcome-file>test.jsp</welcome-file>
  </welcome-file-list>	
 
</web-app>