jtable

[jonathan benz]

Hi all,

I have a table with 5 columns. I was required to validate column 3 and 5 for numeric input.

I could validate numeric cell by cell.
If I do that, I need to write the code for each cell.

Please suggest how I can iterate the column 3 and 5 for the validation

[Rob Spoor]

Just use a TableModel implementation (often a (anonymous) DefaultTableModel subclass) that overrides getColumnClass to return Integer.class for columns 3 and 5. JTable has built-in support for numbers, so there will be validation upon input.

[jonathan benz]

thanks Rob

Here i would like to display a JOptionMessageDialog message for non-numeric value for column 1 and 2 only

import java.awt.BorderLayout;

import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.TableColumn;

public class JTableCreatingDemo {
  public static void main(String args[]) {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    final JTable jTable1 = new JTable();
    
    
    jTable1.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {
                    {null, null, null, null},
                    {null, null, null, null},
                    {null, null, null, null},
                    {null, null, null, null}
                },
                new String [] {
                    "Title 1", "Title 2", "Title 3", "Title 4"
                }
            ) {
                Class[] types = new Class [] {
                    java.lang.Integer.class, java.lang.Integer.class, java.lang.Object.class, java.lang.Object.class
                };

                public Class getColumnClass(int columnIndex) {
                    return types [columnIndex];
                }
            });
  
    
    jTable1.getModel().addTableModelListener( new TableModelListener()
	{
            @Override
			public void tableChanged(TableModelEvent arg0) {
				
			}


	});  
    

    JScrollPane scrollPane = new JScrollPane(jTable1);
    frame.add(scrollPane, BorderLayout.CENTER);
    frame.setSize(300, 150);
    frame.setVisible(true);

  }
}

[Rob Spoor]

Why do you want to display a dialog? The red border you get now is much less intrusive.

[jonathan benz]

Thanks for the reply Rob.

I need to popup an alert message for the user to key-in numeric values.
This system is a questionnaire targeting for the public to give their feedback.

So, it will be more informed if the system prompt an alert message rather than the red line.

please help how can i make an alert instead the red bolder?