JSTL Function Tag Library

Topic

What is Function Tag Library in JSP?

Explanation

JSTL Function Tag Library lists set of functions that can be used with the JSP Expression Language or EL.

The following table list all the function in JSTL Function Library.

Syntax:

    <%@ taglib uri="http://java.sun.com/jsp/jstl/functions" 
    prefix="fn" %>

Functions Syntax	Description
fn:contains()	Returns true if string contains the substring
fn:containsIgnoreCase()	Returns true if string contains the substring,ignores case
fn:endsWith()	Returns true if the string ends with a suffix
fn:escapeXml()	Returns strings as it is that have special meaning in XML,converted to XML character entity code.
fn:indexOf()	Returns index for the first occurence of substring.
fn:join()	Returns strings from array with the given seperator.
fn:length()	Returns the number of elements from a array or a collection,characters from a string.
fn:replace()	Returns a string with the before strings with the after strings.
fn:split()	Returns an array with element got by separating the string with the seperator.
fn:startsWith()	Returns true if the string starts with the prefix.
fn:substring()	Returns a string with begin index till the end index.
fn:substringAfter()	Returns the part of the string after the substring.
fn:substringBefore()	Returns the part of the string before the substring.
fn:toLowerCase()	Returns the allcharacter of a string in lowercase.
fn:toUppercase()	Returns the allcharacter of a string in uppercase.
fn:trim()	Returns the string removing trailing and leading whitespaces.