JSTL Function fn:length Example

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Last Updated on 31 August 2019   |   Print  Email


This post helps you understand how to use the <fn:length> tag in the JSTL function tags library with code example.

The fn:length function returns the number of characters in a string or number of items in any collection.

 

JSTL <fn:length> Syntax:

${fn:length(collection | string)}

 

JSTL <fn:length> Example:

The below code example prints the number of characters in a string.

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn"%>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
    <title>fn:length Demo</title>
  </head>
  <body>
	<h1>fn:length Demo</h1>

	<c:set var="text" value="Code Java" />
	<c:out value="${text}"/>
	<p>Length: ${fn:length(text)}</p>	
  </body>
</html>

 

Output:

JSTL function fn-length

 

Other JSTL Function Tags:

contains  |  containsIgnoreCase  |  endsWith |  escapeXml  |  indexOf  |  join  |  replace  |  split  |  startsWith  |  substring  |  substringAfter  |  substringBefore  |  toLowercase  |  toUpperCase  |  trim


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is certified Java programmer (SCJP and SCWCD). He began programming with Java back in the days of Java 1.4 and has been passionate about it ever since. You can connect with him on Facebook and watch his Java videos on YouTube.



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