Use of <fn:trim(String)JSTL Tag
In this section we will learn how to use <fn:trim> Tag of JSTL. This tag removes white spaces from both ends of specified string. This takes string type as arguments and return string type result.
| Syntax : |
java.lang.String trim(java.lang.String) |
trim_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:trim tag of JSTL</title>
</head>
<body>
<form method="POST">
This application removes blank spaces from both ends of string.
<table>
<tr>
<td>Enter string</td>
<td><input type="text" name="text"></td>
</tr>
<tr>
<td></td>
<td><input type="submit" value="trim"></td>
</tr>
</table>
</form>
<c:if test="${pageContext.request.method=='POST'}">
<c:set var="text" value="${param.text}"/>
<c:set var="trimText" value="${fn:trim(text)}"/>
<table border="1">
<tr>
<th>Before trim</th>
<th>After trim</th>
<th>Before trim string length</th>
<th>After trim string length</th>
</tr>
<tr>
<td><c:out value="${text}" /></td>
<td><c:out value="${trimText}"/></td>
<td><c:out value="${fn:length(text)}" /></td>
<td><c:out value="${fn:length(trimText)}" /></td>
</tr>
</table>
</c:if>
</body>
</html>
|
This jsp code shows the following output :
Here user will enter string with some white spaces like......
When user clicks on trim button, output will be.......
