Am 09.06.2011 09:01, schrieb Nivedan Nadaraj:
Hi All,
I have a problem to deal with binding selected values into a model within a
ListView. I have tried to outline the approach and class definitions out
here. I hope I have been clear. Would appreciate your thoughts on the design
and approach i have taken so far. I guess am pretty close to it just one
hurdle.
public class MainVO{
private List<UserModuleRole> userRoleList;
}
public class UserModuleRole{
private Role role;
private Module module;
private User user;
}
*Problem:*
1. I want to list the modules and the roles available for each module in a
list view.
2. Select a Role from each module for a user
3. Save - Will have the user linked to one or more modules with a role for
each.(only one role per module)
*Approach*
I used a ListView and rendered the list of modules and their respective
roles in a drop down. To render this List view these are the steps I took.
public class ModuleVO implements Serializable{
private Module module;
private List<Role> moduleRoles;
}
1. I get a Collection/List of ModuleVO via the service. The collection will
have a ModuleVO per module with the associated roles as a member.
2. I iterated the list and rendered the Module and render a DropDownChoice
3. End of which I get the following output in the list
*
Output from List view*:
Module Role
--------------------
Module-A Role-1
Role-2
Module-B Role-3
Role-4
What I have not done and not clear is:
4. At this time I have not bound a Model to the dropdown and just used new
Model() for the Model argument of dropDownChoice.
I know that the selected values must eventually be in the MainVO's
List<UserModuleRole> userRoleList property.
What is not very clear to me at this point is how to bind it ...so that when
the user saves the selected values are captured. I am sure this is possible
and should be elegant. Your thoughts and time will be of great value.
Many thanks
Regards
Instanciate the MainVO with a UserModuleRole for every Module and the
known user. The role
has only to be loaded if it's already assigned. That is the base.
If your listview is on a panel / form - give it the MainVO instance.
Set the MainVO.userRoleList to the ListView by using a
PropertyModel<List<UserModuleRole>>.
In ListView.populateItem you get every single UserModuleRole. Render the
UserModuleRole to the
ListViewItem.
The DDC for the roles gets a PropertyModel pointing to the
UserModuleRole of the ListViewItem.
The selectable Roles have to be provided by a LoadableDetachableModel
calling your service.
Hth
Cheers
Per
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