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  • if-else in jstl

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    In JSTL, the functionality if-else is provided by choose-when-otherwise statement .

    <c:choose> tag is an enclosing tag for <c:when> and <c:otherwise>. And it is also known as mutual exclusion as only a block of code within the condition of mutual exclusion be executed. <c:when> and <c:otherwise> both come under this <c:choose> tag.


    <c:when> tag is equivalent to the case statements of a switch statement. <c:when> statements are considered as more advanced than case statements as switch case statements only compares the variable mentioned in the switch statement w.r.t the constant in case statement while the <c:when> tag evaluates the expressions.


    <c:otherwise> tag is equivalent to the else statements.

    Example:

    <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
    <html>
         <head>
             <title> Choose,Otherwise and When (if-else in JSTL)</title>
         </head>
    
         <body>
             <c:if test="${pageContext.request.method=='POST'}">I have
                 <c:out value="${param.enter}" />
    
                 <c:choose>
    
                       <c:when test="${param.enter=='0'}">(means no ) notebook.
                      <br />
                     </c:when>
    
                    <c:when test="${param.enter=='1'}">notebook.
                     <br />
                      </c:when>
    
                     <c:otherwise>notebooks.
                      <br />
                     </c:otherwise>
    
                 </c:choose>
             </c:if>
    
             <form method="post">Enter a number:
             <input type="text" name="enter" />
    
             <input type="submit" value="accept" />
    
             <br />
             </form>
         </body>
    </html>
    

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