| 1 | <!-- |
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| 2 | Licensed to the Apache Software Foundation (ASF) under one or more |
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| 3 | contributor license agreements. See the NOTICE file distributed with |
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| 4 | this work for additional information regarding copyright ownership. |
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| 5 | The ASF licenses this file to You under the Apache License, Version 2.0 |
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| 6 | (the "License"); you may not use this file except in compliance with |
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| 7 | the License. You may obtain a copy of the License at |
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| 8 | |
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| 9 | http://www.apache.org/licenses/LICENSE-2.0 |
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| 10 | |
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| 11 | Unless required by applicable law or agreed to in writing, software |
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| 12 | distributed under the License is distributed on an "AS IS" BASIS, |
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| 13 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 14 | See the License for the specific language governing permissions and |
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| 15 | limitations under the License. |
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| 16 | --> |
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| 17 | <%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %> |
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| 18 | <%@ taglib prefix="my" uri="http://jakarta.apache.org/tomcat/jsp2-example-taglib"%> |
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| 19 | |
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| 20 | <html> |
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| 21 | <head> |
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| 22 | <title>JSP 2.0 Expression Language - Functions</title> |
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| 23 | </head> |
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| 24 | <body> |
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| 25 | <h1>JSP 2.0 Expression Language - Functions</h1> |
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| 26 | <hr> |
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| 27 | An upgrade from the JSTL expression language, the JSP 2.0 EL also |
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| 28 | allows for simple function invocation. Functions are defined |
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| 29 | by tag libraries and are implemented by a Java programmer as |
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| 30 | static methods. |
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| 31 | |
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| 32 | <blockquote> |
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| 33 | <u><b>Change Parameter</b></u> |
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| 34 | <form action="functions.jsp" method="GET"> |
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| 35 | foo = <input type="text" name="foo" value="${fn:escapeXml(param["foo"])}"> |
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| 36 | <input type="submit"> |
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| 37 | </form> |
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| 38 | <br> |
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| 39 | <code> |
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| 40 | <table border="1"> |
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| 41 | <thead> |
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| 42 | <td><b>EL Expression</b></td> |
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| 43 | <td><b>Result</b></td> |
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| 44 | </thead> |
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| 45 | <tr> |
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| 46 | <td>\${param["foo"]}</td> |
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| 47 | <td>${fn:escapeXml(param["foo"])} </td> |
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| 48 | </tr> |
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| 49 | <tr> |
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| 50 | <td>\${my:reverse(param["foo"])}</td> |
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| 51 | <td>${my:reverse(fn:escapeXml(param["foo"]))} </td> |
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| 52 | </tr> |
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| 53 | <tr> |
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| 54 | <td>\${my:reverse(my:reverse(param["foo"]))}</td> |
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| 55 | <td>${my:reverse(my:reverse(fn:escapeXml(param["foo"])))} </td> |
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| 56 | </tr> |
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| 57 | <tr> |
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| 58 | <td>\${my:countVowels(param["foo"])}</td> |
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| 59 | <td>${my:countVowels(fn:escapeXml(param["foo"]))} </td> |
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| 60 | </tr> |
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| 61 | </table> |
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| 62 | </code> |
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| 63 | </blockquote> |
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| 64 | </body> |
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| 65 | </html> |
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| 66 | |
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