Ted Husted: html:optionsCollection & Map

[Lars Bergström <la...@systeam.se>]

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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Re: Ted Husted: html:optionsCollection & Map

[Joe Germuska <Jo...@Germuska.com>]

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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>To unsubscribe, e-mail: struts-user-unsubscribe@jakarta.apache.org
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-- 
--
Joe Germuska            
Joe@Germuska.com  
http://blog.germuska.com    
"If nature worked that way, the universe would crash all the time." 
	--Jaron Lanier

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