Question

public class TablePanel extends JPanel implements ActionListener,Serializable
{
    JTable m_table;
    JComboBox combo,combo1;
    DefaultTableModel model=new DefaultTableModel();
    DefaultComboBoxModel model1=new DefaultComboBoxModel();
    DefaultComboBoxModel model2=new DefaultComboBoxModel();
        List<String> field;
    List<String> attrCode;
    TablePanel()
    {

            m_table=new JTable(model);
            m_table.setBackground(Color.WHITE);
            model.addColumn("col1");
            model.addColumn("col2");
            model.addColumn("col3");
            model.addColumn("col4");
            model.addColumn("col5");
            model.addColumn("col6");
            JScrollPane scrollpane=new JScrollPane(m_table);
            scrollpane.setBackground(Color.WHITE);
            Dimension d = m_table.getPreferredSize();
            scrollpane.setPreferredSize(
                new Dimension(d.width,m_table.getRowHeight()*15+1));
            add(scrollpane);

            }

                       attrCode = service.getAllAttributes(value);
               combo1=new JComboBox(model2);
               model1.addElement(attrCode.get(0));
               model1.addElement(attrCode.get(1));
            model1.addElement(attrCode.get(2));
            model1.addElement(attrCode.get(3));
            model1.addElement(attrCode.get(4));
            model1.addElement(attrCode.get(5));
            model1.addElement(attrCode.get(6));
            col=m_table.getColumnModel().getColumn(0);
            col.setCellEditor((new DefaultCellEditor(combo1)));
            combo2=new JComboBox(model3);
            model3.addElement(trans.get(0));
            model3.addElement(trans.get(1));
            model3.addElement(trans.get(2));
            model3.addElement(trans.get(3));
            model3.addElement(trans.get(4));
            col=m_table.getColumnModel().getColumn(2);

            col.setCellEditor((new DefaultCellEditor(combo2)));} }

我有一张桌子，表格中有一些栏目。现在我想要做的两个列是组合框，当用户从column1组合框中选择一些值时，根据用户选择的值，应该填充组合框2。例如，如果用户从column1组合框中选择value1，则column2组合框将仅显示与value1对应的值。

Answer 1

Render两列。

TableColumn comboCol1 = table.getColumnModel().getColumn(0);
TableColumn comboCol2 = table.getColumnModel().getColumn(1);
comboCol1.setCellEditor(new CustomComboBoxEditor());
comboCol2.setCellEditor(new CustomComboBoxEditor());

//这适用于第二列，它取决于第一列的选择。

public class CustomComboBoxEditor extends DefaultCellEditor {

// Declare a model that is used for adding the elements to the `ComboBox`
private DefaultComboBoxModel model;

public CustomComboBoxEditor() {
    super(new JComboBox());
    this.model = (DefaultComboBoxModel)((JComboBox)getComponent()).getModel();
}

@Override
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {


   if(column == 0) {
         // Just show the elements in the JComboBox.         
    } else {

           // Remove previous elements every time.
           // So that we can populate the elements based on the selection.
           model.removeAllElements();

           // getValueAt(..) method will give you the selection that is set for column one.
           String selectedItem = table.getValueAt(row, 0);

          // Using the obtained selected item from the first column JComboBox 
          // selection make a call ans get the list of elements.

         // Say we have list of data from the call we made. 
         // So loop through the list and add them to the model like the following.
         for(int i = 0; i < obtainedList.size(); i++) {
                model.addElement(obtainedList.get(i));
         } 
     } // Close else

    // finally return the component.
    return super.getTableCellEditorComponent(table, value, isSelected, row, column);
 }
}

在jtable中为列的每一行添加不同的组合框

1 个答案: