Jtable combo box issue

[kopparapu v kiran kumar]

Hi,

I'm having a new table with a jcombobox in that. After selecting the first row value from the combox(first row returns selected value properly), if we select the second row value from the combobox it is retruning empty value. How to solve this issue??

Adding the following code in the constructor.

  DefaultTableModel model = (DefaultTableModel) jTable1.getModel();
 //adding a dummy row to the default table.
 model.insertRow(1, new Object[]{"", null, null, "", ""}); //last column corresponds to jcombobox
 TableColumn col = jTable1.getColumnModel().getColumn(4);        
 String[] values = {"", "abc", "xyz"}; // i want to show first value as empty for each row.
 col.setCellEditor(new DefaultCellEditor(getComboBox(values)));
 col.setCellRenderer(new DefaultTableCellRenderer());
.....
//after the constructor...
private JComboBox comboBox;
    private JComboBox getComboBox(String[] values) {
        if (comboBox == null) {
            comboBox = new JComboBox();
        }
        if (values != null && values.length > 0) {
            comboBox.removeAllItems();
            for (String key : values) {
                comboBox.addItem(key);
            }
        }
        return comboBox;
    }
  

Here are my doubts:
Am I addiing only one jcombobox to the entire table instead of adding a new combobox for each row in the table??
If yes how to add new jcombobox for each table.

Please help me to solve this issue.

Thanks and Regards,
Kiran Kumar K.V

[Rob Camick]

The Swing tutorial on "How to Use Tables" has a working example.

[Rob Spoor]

kopparapu v kiran kumar wrote:Am I addiing only one jcombobox to the entire table instead of adding a new combobox for each row in the table??

Yes.

If yes how to add new jcombobox for each table.

You don't need to use a new JComboBox for each table, you just need to replace the JComboBox contents for each cell. You have two choices that I can think of:
1) override JTable's prepareEditor method:

Component c = super.prepareEditor(editor, row, column);
if (c instanceof JComboBox && convertColumnIndexToModel(column) == <the column number from the model>)
{
    JComboBox combo = (JComboBox)c;
    // remove elements, add new elements
    // you can do this by changing the model
}
return c;

2) subclass DefaultTableCellEditor and do something similar in its getTableCellEditorComponent method.

[kopparapu v kiran kumar]

Any example with the DefaultCellEditor would be appreciated.

[Rob Camick]

Again, the tutorial has a working example!

[kopparapu v kiran kumar]

Dear Rob,


Have you tested that example they have given?? It doesn't suits my requirement.... Try to understand the requirement first.


Thanks and Regards
Kiran

[Rob Spoor]

The tutorial shows how to use a combo box as an editor. My code shows how to fill the combo box. How does that not meet your requirements?

[kopparapu v kiran kumar]

Dear Rob Prime,

Sorry. Your name and Rob Camik firname is same(Rob). I thought to convey my message to Rob Camik. Sorry for the overlook.

Thanks and Regards,
Kiran Kumar.

[Rob Spoor]

kopparapu v kiran kumar wrote:I thought to convey my message to Rob Camick.

I got that, but does that mean I am not allowed to reply?

[kopparapu v kiran kumar]

NO!!

[Rob Spoor]

I really hope you're kidding...