How to Retrieve the Row Index of a JTable Cell Containing a JComboBox on Item Selection?

How to Get the CellRow when a JComboBox in a JTable Cell Triggers an ItemEvent

When working with a JTable that contains a JComboBox within its cells, you may encounter the need to retrieve the specific row in which the JComboBox is located upon an item change. This can be tricky, as the ItemListener associated with the JComboBox does not directly provide this information.

Overriding the Default TableCellEditor

One approach is to override the default TableCellEditor and provide your own implementation that includes row access. By overriding the getTableCellEditorComponent() method, you can obtain the row number as a parameter:

import javax.swing.*;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableCellRenderer;
import java.awt.*;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;

public class CustomTableCellEditor extends DefaultCellEditor implements TableCellRenderer {

    private int currentRow; // Add a field to track the current row

    @Override
    public TableCellEditorComponent getTableCellEditorComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
        currentRow = row; // Capture the current row
        return super.getTableCellEditorComponent(table, value, isSelected, hasFocus, row, column);
    }
}

Overriding the TableModel's getValueAt() Method

If you need to perform actions based on the value of another column in the same row, you can override the getValueAt() method of the TableModel to adjust the value returned based on the changed item. For example:

import javax.swing.table.AbstractTableModel;

public class CustomTableModel extends AbstractTableModel {

    @Override
    public Object getValueAt(int row, int column) {
        if (column == 1) {
            return "Dependent Value: " + this.getValueAt(row, 2); // Modify the value based on the selected item in column 2
        } else {
            return super.getValueAt(row, column);
        }
    }
}

By implementing these techniques, you can effectively retrieve the CellRow associated with an ItemEvent in the JComboBox within a JTable cell, enabling you to perform the desired actions based on the selected item and row.

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