home *** CD-ROM | disk | FTP | other *** search
- <!--
- Copyright 2004 The Apache Software Foundation
-
- Licensed under the Apache License, Version 2.0 (the "License");
- you may not use this file except in compliance with the License.
- You may obtain a copy of the License at
-
- http://www.apache.org/licenses/LICENSE-2.0
-
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
- limitations under the License.
- -->
- <%@ taglib prefix="my" uri="http://jakarta.apache.org/tomcat/jsp2-example-taglib"%>
-
- <html>
- <head>
- <title>JSP 2.0 Expression Language - Functions</title>
- </head>
- <body>
- <h1>JSP 2.0 Expression Language - Functions</h1>
- <hr>
- An upgrade from the JSTL expression language, the JSP 2.0 EL also
- allows for simple function invocation. Functions are defined
- by tag libraries and are implemented by a Java programmer as
- static methods.
-
- <blockquote>
- <u><b>Change Parameter</b></u>
- <form action="functions.jsp" method="GET">
- foo = <input type="text" name="foo" value="${param['foo']}">
- <input type="submit">
- </form>
- <br>
- <code>
- <table border="1">
- <thead>
- <td><b>EL Expression</b></td>
- <td><b>Result</b></td>
- </thead>
- <tr>
- <td>\${param["foo"]}</td>
- <td>${param["foo"]} </td>
- </tr>
- <tr>
- <td>\${my:reverse(param["foo"])}</td>
- <td>${my:reverse(param["foo"])} </td>
- </tr>
- <tr>
- <td>\${my:reverse(my:reverse(param["foo"]))}</td>
- <td>${my:reverse(my:reverse(param["foo"]))} </td>
- </tr>
- <tr>
- <td>\${my:countVowels(param["foo"])}</td>
- <td>${my:countVowels(param["foo"])} </td>
- </tr>
- </table>
- </code>
- </blockquote>
- </body>
- </html>
-
-