Urgent! jtable get value when cell is edited

[Vinod Venugopal]

Hi,
I have a JTable with model extended from DefaultTableModel. The table is in a frame with a Save button. If a cell is edited & when I click on Save , the new cell values should be obtained.Im not able to get the updated values on Save. Im storing the selected row in a vector. Any suggestions pls.
Vinod

[Renee Zhang]

I think there are 2 ways to do that.
One way is to addTableModelListener to your tablemodel.
yourTableModel.addTableModelListener(new TableModelListener() {
public void tableChanged (TableModelEvent e) {
int row = e.getFirstRow();
int column = e.getColumn();
String columnName = model.getColumnName(column);
Object data = model.getValueAt(row, column);
...// Do something with the data...
}
}
});
Another way is to override setValueAt method in your tableModel.
public void setValueAt(Object value, int row, int col) {
//You get rowNumber , columnNumber and new value here
//Do something with the data.
}
At last there is something that you have to know. If the CellEditor doesn't get a "stopCellEditing" call, the underlying DataModel doesn't get updated via setValueAt(value, row, col).So you have to stop the CellEditor programmatically by adding one line yourTable.getCellEditor().stopCellEditing();
Good luck!

[Vinod Venugopal]

Thanx for the suggestion..but I need to press Enter to register the changes & then press Save button to send the changed data. Any way to bypass pressing Enter?( using ur tablemodellistener)

[Paul Stevens]

tablename.getModel().getValueAt(row, col)
This method will return an Object. Just cast it to whatever it should be for the given col.

[george justin]

Originally posted by Vinod Venugopal:
Hi,
I have a JTable with model extended from DefaultTableModel. The table is in a frame with a Save button. If a cell is edited & when I click on Save , the new cell values should be obtained.Im not able to get the updated values on Save. Im storing the selected row in a vector. Any suggestions pls.
Vinod

Hi Vinod
in the action performed method of the button, u can write
.
.
table.getCellEditor().stopCellEditing();
.
.
this works well..
i hope u have Overridden
setValueAt(..)

method from AbstractTableModel or DefaultTableModel class.
getCellEditor returns and instance of DefaultCellEditor if u have not subclassed any CellEditor, if so cast it to the corresponding CellEditor..
Try out if not mail me i will mail u the code.
Good Luck
George Justin

[Vinod Venugopal]

I tried overriding setValueAt() & calling fireTablecellupdated() but still it doesnt register the new cell value when I click on my Save button. Could u pls send me the piece of code that could help.
Thanx,
Vinod

[Manfred Leonhardt]

Hi Vinod,
Using Georges' suggestion, I did the following and it worked great.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TableTest extends Frame
{
  private JTable table;
  private JScrollPane scrollPane;
  //
  // Constructor
  //
  public TableTest()
  {
    setSize( 400, 400 );
    table = new JTable( 10, 4 );
    table.setRowSelectionAllowed( false );
    table.setColumnSelectionAllowed( false );
    table.setCellSelectionEnabled( false );
    scrollPane = new JScrollPane( table );
    Panel p = new Panel();
    Button b = new Button( "Dump" );
    b.addActionListener(
      new ActionListener()
      {
        public void actionPerformed( ActionEvent ae )
        {
          table.getCellEditor().stopCellEditing();
          // Fill table with stuff.
          for( int row = 0; row < table.getRowCount(); ++row )
          {
            for( int col = 0; col < table.getColumnCount(); ++col )
            {
              System.out.print( "  " + row + "," + col + " = " + table.getValueAt( row, col ) );
            }
            System.out.println( " " );
          }
        }
      });
    p.add( b );
    b = new Button( "Quit" );
    b.addActionListener(
      new ActionListener()
      {
        public void actionPerformed( ActionEvent ae )
        {
          System.exit( 0 );
        }
      });
    p.add( b );
    add( scrollPane, BorderLayout.CENTER );
    add( p, BorderLayout.SOUTH );
  }
  //
  // Main method.
  //
  public static void main(String[] args) 
  {
    TableTest tt = new TableTest();
    tt.setVisible( true );
  }
}

Just type in some value and hit the dump button to see the typed results (without hitting return!).
Regards,
Manfred.

[Vinod Venugopal]

Thanx a lot Manfred & everybody else who gave me suggestions, it worked out fine.
Regards,
Vinod