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| <%@ 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> |
| |
