[jboss-user] [JBoss Seam] - Re: How to send a parameter with checkbox in JSF in order to

[yj4jboss]

I guess you want to implement multiple selections in a datatable. I experienced this issue a while ago and could only work around this problem with the following approach. Its requires a bit of work but it works fine ....

The idea is to have an object as a view with the boolean variable representing the selection status....

As such i have a Generic View 

  | 
  | public abstract class GenericView<T> {
  | 
  | 	private boolean selected=new Boolean(false);	
  | 
  | 	private T persistentInstance;		
  | 
  | 	public boolean isSelected() {
  | 		return selected;
  | 	}
  | 
  | 	public void setSelected(boolean isSelected) {
  | 		this.selected = isSelected;
  | 	}
  | 
  | 	public T getPersistentInstance() {
  | 		return persistentInstance;
  | 	}
  | 
  | 	public void setPersistentInstance(T persitentInstance) {
  | 		this.persistentInstance = persitentInstance;
  | 	}
  | }
  | 

I then create a view specific for the object i want to use 

  | public class UserSelectionView extends GenericView<User> {
  | 
  | }
  | 
And a Mapper class which will map the view to the object and vice versa as required :

  | public abstract class UserViewMapper {
  | 	
  | 	public static User MapViewToUser(UserSelectionView view){
  | 		return view.getPersistentInstance();
  | 	}
  | 	
  | 	public static UserSelectionView MapUserToView(User user){
  | 		
  | 		UserSelectionView view = new UserSelectionView();
  | 		
  | 		view.setPersistentInstance(user);
  | 		view.setSelected(false);
  | 		
  | 		return view;
  | 	}
  | 	
  | 
  | }
  | 
  | 



In my SFSB, i then use the view as data model and a list of the object 


  | @DataModel
  | 	private List<UserSelectionView> userViewListing = new LinkedList<UserSelectionView>();
  | 
  | 
  | @Factory("userViewListing")
  | 	public void ListUserSelectionViews(){
  |        
  |     List<User> userList = userDAO.selectAll();
  | 
  |    for(User user:userList){
  | 	userViewListing.add(UserViewMapper.MapUserToView(user));
  |    }
  | 
  | }
  | 
  | 
  | public void deleteSelectedUser(){
  | 
  | for(UserSelectionView userView:userViewListing){
  |    if(userView.isSelected()){
  | 				userDAO.remove(UserViewMapper.MapViewToUser(userView));     
  |    }
  | }
  | 
  | }
  | 


Let me know how it goes ...

Cheers,
Jankee Yogesh
Software Developer
http://www.m-itc.net/

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