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fn:length() – JSTL Function

By Chaitanya Singh | Filed Under: JSTL

The JSTL function fn:length() is used for computing the length of a string or to find out the number of elements in a collection.

Syntax

int length(Object)

Return type of this function is int. It returns the length of the object provided in it as an argument.

Example of fn:length()

Here we are computing the length of the three different strings using the function.

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
<html>
<head>
<title>JSTL fn:length() example</title>
</head>
<body>
<c:set var="string1" value="This is String1"/>
<c:set var="string2" value="Hi"/>
<c:set var="string3" value="string3"/>
Length of String1 is: ${fn:length(string1)}<br>
Length of String2 is: ${fn:length(string2)}<br>
Length of String3 is: ${fn:length(string3)}
</body>
</html>

Output:

fn-length-example

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  3. JSTL <c:forEach> and <c:forTokens> Core Tags
  4. fn:escapeXml() – JSTL Function
  5. fn:contains() – JSTL Function
  6. JSTL <c:param> Core Tag

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JSTL Core Tags

  • c:out
  • c:set
  • c:remove
  • c:if
  • c:choose
  • c:when
  • c:otherwise
  • c:catch
  • c:import
  • c:forEach
  • c:forTokens
  • c:param
  • c:url
  • c:redirect
JSTL Functions
  • fn:contains()
  • fn:containsIgnoreCase()
  • fn:indexOf()
  • fn:escapeXML()
  • fn:join() & fn:split()
  • fn:length()
  • fn:startsWith()
  • fn:endsWith()
  • fn:substring()
  • fn:substringAfter()
  • fn:substringBefore()
  • fn:trim()
  • fn:toUpperCase()
  • fn:toLowerCase()
  • fn:replace()

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