Re: Ted Husted: html:optionsCollection & Map

[Joe Germuska]

From looking at the source, when given a 
java.util.Map, OptionsCollectionTag iterates 
through the entrySet, not the keySet or the 
values collection.  Therefore, when the "label" 
and "value" of each bean is dereferenced, the 
properties must be relative to a Map.Entry bean. 
It looks as if you wrote your tag assuming that 
it would iterate through the values collection.

Given the signature of Map.Entry, you could 
dereference a nested property beginning with 
"value" -- that is, something like

<html:optionsCollection name="yourMapName" 
label="value.label" value="value.value" .../>

Joe



and where
At 13:46 +0200 9/18/03, Lars Bergström wrote:
Dear Ted,

I am trying to get my html:optionsCollection to work with a TreeMap. I
don't
know if this is possible but on the Struts API page for the class
OptionsCollectionTag I read the following:
"The collection may be an array of objects, a Collection, an
Enumeration, an
Iterator, or a Map."
(
http://jakarta.apache.org/struts/api/org/apache/struts/taglib/html/Opti
onsCollectionTag.html)
Since TreeMap implements SortedMap which is a subinterface of Map,
TreeMap
should work fine, right?
However, when the page is loaded I get the folloing error text:
"HTTP ERROR: 500 No getter method available for property label for bean
under
name 1=LabelValueBean[Label 1, Value 1]"
Can anyone explain this error message? This seems strange to me.

The returntype in my ActionFormBean is TreeMap and the code snippet
where I
build up the TreeMap is like this:
eventGroups = new TreeMap();
eventGroups.put( new String( "1" ),
                 new LabelValueBean( "Label 1",
                                     "Value 1" ) );
eventGroups.put( new String( "2" ),
                 new LabelValueBean( "Label 2",
                                     "Value 2" ) );
eventGroups.put( new String( "3" ),
                 new LabelValueBean( "Label 3",
                                     "Value 3" ) );
((EventGroupBean)form).setEventGroups( eventGroups );
(
Best regards

Lasse



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Joe Germuska
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http://blog.germuska.com
"If nature worked that way, the universe would crash all the time."
        --Jaron Lanier
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