Re: EL access to a bean property... ?

[Bill Siggelkow]

Roy, if you are using JSP 2.0 (e.g. with Tomcat 5) and JSTL 1.1 you can 
do the following:

<[EMAIL PROTECTED] isELIgnored="false"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions"; prefix="fn" %>
Map size is ${fn:length(TableRows)}

Roy Benjamin wrote:

Very interesting, so wrapping would work, but you can't
just expose a Bean property.
I've switched to c-rt for now, 

Thanks!

On Fri, 2004-03-26 at 10:35, Kris Schneider wrote:

Maps are treated differently than regular JavaBeans so that you can't access
bean properties. For example, every object has a bean property called "class",
but you won't get any output if you try ${map.class}. It's even more fun to try
and get at a map's "empty" property ;-). If all you're concerned with is
testing whether a map is empty or not, you can use ${not empty map}. If you
really need the size of the map, you could try the Unstandard taglib:
http://jakarta.apache.org/taglibs/sandbox/doc/unstandard-doc/intro.html

Or do something like create a wrapper bean for collections that exposes a "size"
property and delegates to the wrapped collection.
Quoting Roy Benjamin <[EMAIL PROTECTED]>:


I am displaying the values in a TreeMap using forEach tag.
However, I only want to do this if the map is not empty.
I also need to display the count of entries in the map at
the top of the page.
In TreeMap, size/size() is not a Bean Property (no?) so I tried
in-line subclassing to expose the property:
<%
 TreeMap treeMap = new TreeMap() {
     public int getSize(){return size();}
   };
 pageContext.setAttribute("TableRows",treeMap);
%>
now much later I try:

<TD>
Search Results:&nbsp;<c:out value="${TableRows.size}"/>&nbsp;found.
</TD>
I could just count things as they are added to the map
over a series of SQL queries, but it seemed to me this
was the better solution.. only the EL expression is null.
I'm sure I'm doing something wrong....

Thanks

Roy


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