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From Caroline Jen <jiapei_...@yahoo.com>
Subject Pagination and Memorizing Marked Checkboxes
Date Fri, 28 Jul 2006 21:41:36 GMT
I display a List of objects.  

Because the List can be very long, I use a pagination
tag library to display my long list 10 at a time. 
This taglib is not a front-end one.  The taglib makes
a trip to the back end to retrieve the next 10 records
from the database when the next pagination link is
clicked.

Each object is with a checkbox attached.  and this is
the way I code it:
[code]
<html-el:checkbox property="selectedUserIds"
value="${user.userIDCode}" />
<html-el:checkbox
property="selectedUsers[${idx.index}].selected" />
[/code]

Clients may navigate page by page to mark certain
checkboxes in each page.  And I have to make sure that
all marked checkboxes are kept in memory when clients
finally click on the 'Submit' button.

The way that I code my form may not be right:
[code]
.....
.....
public class SelectUsersForm extends ActionForm
{
	private Map selectedUserFieldMap = new HashMap();
	private String[] selectedUsers = new String[0];
	private String[] selectedUserIDs;


    public SelectedUserField getSelectedUsers( int
index )
    {
       SelectedUserField selectedUserField = (
SelectedUserField )selectedUserFieldMap.get( new
Integer( index ) );
       if ( selectedUserField == null )
       {
         selectedUserField = new SelectedUserField();
         selectedUserFieldMap.put( new Integer( index
), selectedUserField );
       }
       return selectedUserField;
    }

    // Convenience method to get a list of selected
user IDs.
    public String[] getSelectedUserIDs()
    {
       List theUserIDList = new ArrayList();

       Iterator i =
selectedUserFieldMap.values().iterator();
       while( i.hasNext() )
       {
          SelectedUserField selectedUserField = (
SelectedUserField ) i.next();
          if ( selectedUserField.isSelected() )
          {
             theUserIDList.add(
selectedUserField.getId() );
          }
       }
       return ( String[] )theUserIDList.toArray( new
String[theUserIDList.size()] );
   }

   public void reset( ActionMapping mapping,
HttpServletRequest request)
   {
       selectedUsers = new String[0];
       selectedUserIDs = new String[0];
   }
}
[/code]
and the SelectedUserField.java is like:
[code]
package gov.cbp.ace.st.tf.web.admin.form;

import java.sql.Timestamp;

public class SelectedUserField
{
    private boolean selected = false;
    private Long id;
    
    public Long getId()
    {
       return id;
    }

    public void setId( Long newValue )
    {
       id = newValue;
    }

    public boolean isSelected()
    {
       return selected;
    }

    public void setSelected( boolean newValue )
    {
       selected = newValue;
    }
}
[/code]

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