[jboss-user] [JBoss Seam] - Re: 2 DataModel questions

[bfo81]

I haven't seen a Seam example for that. It's been something else but that's a long time ago.

Well, I just tried something out. I have a list of persons (my favorite example here in the seam forum *g*), and the person has friends (that are persons, too).

In that list of persons each person has a column where all friends are listed:<h:dataTable var="person" value="#{personList.entries}">
  | 
  |     <h:column>#{person.name}</h:column>
  |     <h:column>#{person.nick}</h:column>
  |     <h:column>#{person.country}</h:column>
  |     <h:column>
  |         <h:dataTable var="friend" value="#{person.friends}">
  |             <h:column>#{friend.name}</h:column>
  |          </h:dataTable>
  |     </h:column>
  | </h:dataTable>

And it works, look:
  | +-------------------+-------+-------------+-----------------+
  | | Stefan Berkmiller | bfo81 | Deutschland | Frank Hoyer     |
  | |                   |       |             | Florian Mueller |
  | |                   |       |             | ...             |
  | +-------------------+-------+-------------+-----------------+
  | | .....

Problem here: The datatable is shown for every person. You may add a link "Show Friends" that stores the id. Well, look:

Your bean:
  | @RequestParameter
  | private Long personId;
  | 
  | @Out(required=false)
  | private Long showFriendsForPersonId;
  | 
  | public String showFriends() {
  |     showFriendsForPersonId = personId;
  |     return null;
  | }

And then your Detail column should be like this:

  | <h:column>
  | 
  |     <h:commandLink value="Show Friends" action="#{yourBean.showFriends}" rendered="#{showFriendsForPersonId != person.id}">
  |         <f:param name="personId" value="#{person.id}">
  |     </h:commandLink>
  | 
  |     <h:dataTable ... rendered="#{showFriendsForPersonId == person.id}">
  |         shows friends, see above
  | </h:column>
  | ...

Then there is always only one person whose friends are shown and the other persons have a "Show Friends" link.


Is that about what you're looking for?

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