Re: how to use methods with parameters

[Pierre Delisle]

is it possible to use JSTL for an expression like
 
<%=calculateDays(startDate, endDate) %> ???
 
 
probably not, but I am too new to JSTL to figure it out by myself. Could
someone advise me?
This could be possible through an EL function (introduced in JSP 2.0).
The syntax would be as follows:
 ${acme:calculateDays(startDate, endDate)}

You'd have to define in one of your classes a static method "calculateDays" with the 
proper
signature (Date, Date). The name, class, and signature would then have to be defined
within a <function> element in a TLD.
Here is a snapshot of 'fn.tld' for the standardized functions 
in JSTL 1.1:

---
<?xml version="1.0" encoding="UTF-8" ?>
<taglib xmlns="http://java.sun.com/xml/ns/j2ee";
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
 xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee web-jsptaglibrary_2_0.xsd"
 version="2.0">
   
 <description>JSTL 1.1 functions library</description>
 <display-name>JSTL functions</display-name>
 <tlib-version>1.1</tlib-version>
 <short-name>fn</short-name>
 <uri>http://java.sun.com/jsp/jstl/functions</uri>

 <function>
   <description>
     Tests if an input string contains the specified substring.
   </description>
   <name>contains</name>
   <function-class>org.apache.taglibs.standard.functions.Functions</function-class>
   <function-signature>boolean contains(java.lang.String, 
java.lang.String)</function-signature>
   <example>
     &lt;c:if test="${fn:contains(name, searchString)}">
   </example>
 </function>
 ...
---
   -- Pierre

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