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.....
