Use of <fn:indexOf(String, String)> Tag of JSTL
In this section we will learn how to use <fn:indexOf
>
Tag of JSTL. This tag returns index of first occurrence of specified sub string
in the given string string. This takes string type as arguments and returns int
type.
Syntax : |
int indexOf(java.lang.String,
java.lang.String) |
indexOf_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:indexof tag of JSTL</title> </head> <body> <form method="POST"> This will calculate the first occurance of given character/string in the <br>specified String. <table> <tr> <td>Enter Text</td> <td><input type="text" name="text"></td> </tr> <tr> <td>Search</td> <td><input type="text" name="str"></td> </tr> <tr> <td></td> <td><input type="submit" value="search"></td> </tr> </table> </form> <c:if test="${pageContext.request.method=='POST'}"> <c:set var="text" value="${param.text}"/> <c:set var="str" value="${param.str}"/> <font size="5" color="#1B2A0A"> Index of first occurance : </font> <font size="5" color="green"> <c:out value="${fn:indexOf(text,str)}"/> </font> </c:if> </body> </html> |
This jsp code shows the following output :
Suppose in 'mahendra singh' string user want to find index of the first occurrence of 'e'....
When user clicks on search button, output will be.....