Share on Google+Share on Google+

Use of Tag of JSTL

Advertisement
In this section, will learn how to use Tag of JSTL.

Use of <fn:length(String)> Tag of JSTL

     

In this section we will learn how to use <fn:length> Tag of JSTL. This tag returns the number of items in a collection, or the number of characters in a string. This takes Object type as arguments and returns int type.

Syntax :
int length(java.lang.Object)









length_fnJstlTag.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
<html>
    <head>
        <title>Example of fn:length tag of JSTL</title>
    </head>
    <body>
        <form method="POST">
            This will calculate the length of specified string.
            <table>
                <tr>
                    <td>Enter String</td>
                    <td><input type="text" name="text"></td>
                </tr>
                
                <tr>
                    <td></td>
                    <td><input type="submit" value="calculate"></td>
                </tr>
            </table>  
        </form>
        <c:if test="${pageContext.request.method=='POST'}">
            <c:set var="text" value="${param.text}"/>
            
            <font size="5" color="#1B2A0A">
                Length : 
            </font>
            <font size="5" color="green">

                <c:out value="${fn:length(text)}"/>
                
            </font>
        </c:if>
    </body>
</html>


This jsp code shows the following output :



Suppose in user wants to calculate the length of string 'mahendra singh'.....



When user clicks on calculate button, output will be.....



Download Source Code

Advertisements

Advertisement

Posted on: August 24, 2008 If you enjoyed this post then why not add us on Google+? Add us to your Circles

Share this Tutorial Follow us on Twitter, or add us on Facebook or Google Plus to keep you updated with the recent trends of Java and other open source platforms.

Comments:0