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How to Retrieve the Row Index of a Table ComboBox Triggering an ItemEvent?

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2024-12-13 19:28:10313browse

How to Retrieve the Row Index of a Table ComboBox Triggering an ItemEvent?

Retrieving the CellRow of an ItemEvent in a Table ComboBox

When working with a JTable containing columns with Combo Boxes, it can be necessary to obtain the row of the ComboBox that triggered an ItemEvent. However, the ItemListener lacks a method for this.

How to Determine the CellRow

To retrieve the desired row, consider the following options:

Using the TableCellEditor

In "Using a Combo Box as an Editor," the TableCellEditor's getTableCellEditorComponent() method includes the row as a parameter. This method can be used to access the row.

Synchronizing Dependent Columns

Utilizing the getValueAt() Method

By overriding the model's getValueAt() method, you can establish a relationship between the ComboBox column and other columns within the same row. Modified code:

import java.awt.*;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.io.IOException;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableColumn;

public class DependentColumn extends JFrame {

    private static final int DEPENDENT_COL = 1;
    private static final int ITEM_COL = 2;
    private static final String[] columnNames = {"Col 1", "Col 2", "Col 3"};

    public static void main(String args[]) throws IOException {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                DependentColumn dc = new DependentColumn();
            }
        });
    }

    public DependentColumn() {

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