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https://issues.apache.org/struts/browse/WW-1557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_39651
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Dale Newfield commented on WW-1557:
-----------------------------------
That was the answer I was missing, and OGNL's "projection" is a simple way of
extracting a collection of keys from a collection of entities. The example in
the initial issue just needed value="%{event.communities.{shortName}}" (because
listKey is "shortName").
Like so:
<s:select label="%{getText('event.communities')}"
name="eventCommunityShortNames"
multiple="true"
value="%{event.communities.{shortName}}"
list="%{user.canCreateEventsForCommunities}"
listKey="shortName"
listValue="fullName"
size="4"/>
This also means that the comment is correct--it does work with both Collections
and Arrays.
> multiple="true" does not work in s:select tag
> ---------------------------------------------
>
> Key: WW-1557
> URL: https://issues.apache.org/struts/browse/WW-1557
> Project: Struts 2
> Issue Type: Bug
> Components: Views
> Affects Versions: 2.0.1
> Reporter: Dale Newfield
> Assigned To: David H. DeWolf
> Fix For: 2.0.3
>
>
> The comments in the code for the multiple attribute in the SelectTag states:
> "Creates a multiple select. The tag will pre-select multiple values if the
> values are passed as an Array (of appropriate types) via the value attribute.
> Passing a Collection may work too? Haven't tested this."
> I have tried to use this both with a Collection, an Array, and a single
> value, and as far as I can tell none work. It does generate a select with
> the multiple attribute set, but I cannot figure out how to get any of the
> options to be marked as selected.
> In the following tag I have tried value="%{event.communities}"
> value="%{event.communities.toArray()}" value="%{event.communities[0]}" and
> many other variants, with no success. I have displayed the content of
> event.communities (and lots of other variations) using s:property tags, so I
> know that the values are there...
> <s:select label="%{getText('event.communities')}"
> name="eventCommunityShortNames"
> multiple="true"
> value="%{event.communities}"
> list="%{user.canCreateEventsForCommunities}"
> listKey="shortName"
> listValue="fullName"
> size="4"/>
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