Adding checkbox in table column

[Rite Sara]

Hi,

I want to add checkbox in a table column. I used following code for this.

   
import java.awt.*;    
import javax.swing.*;    
import javax.swing.table.*;    
  
public class TableTest extends JFrame    
{    
public TableTest()    
{        
  
String[] columnNames = {"checkbox","Description"};  

Object[][] data =    
{    
{new javax.swing.JCheckBox() , "test"},  
};    
  
DefaultTableModel model = new DefaultTableModel(data, columnNames);    
JTable table = new JTable( model )    
{    
// Returning the Class of each column will allow different    
// renderers to be used based on Class    
public Class getColumnClass(int column)    
{    
return getValueAt(0, column).getClass();    
}    
};    
  
table.setDefaultRenderer(Component.class, new MyCellRenderer()); 

table.setPreferredScrollableViewportSize(table.getPreferredSize());    
  
JScrollPane scrollPane = new JScrollPane( table );    
getContentPane().add( scrollPane );    
}    
  
class MyCellRenderer implements TableCellRenderer    
{    
public Component getTableCellRendererComponent(JTable table,    
Object value,    
boolean isSelected,    
boolean hasFocus,    
int row,    
int column)    
{    
Component com = (Component)value;    
return com;    
}    
  
}    
  
public static void main(String[] args)    
{    
TableTest frame = new TableTest();    
frame.setDefaultCloseOperation( EXIT_ON_CLOSE );    
frame.pack();    
frame.setVisible(true);    
}    
 

I am able to get checkboxes in a column....but the issue is ... they are not selectable i.e. I am not able to tick them...
Also, I would like to know how we can get row value for which checkbox is checked ??



Thanks ,

[Michael Dunn]

try the sample code from the sun site 'how to use tables',
one of the columns is a (selectable/tickable) checkbox

[Rite Sara]

Hi,

I had a look at following code given by SUN ...
http://java.sun.com/docs/books/tutorial/uiswing/examples/components/TableSelectionDemoProject/src/components/TableSelectionDemo.java

But since I am very new to Swings, was unable to modify that code as per my requirement .. tried a lott ...
My requirement is very simple.. There are 2 columns in a table .. 1st -> Checkbox ... 2nd -> Name .. and there is one button (OK)..
Onclick of button OK ... I want a list which contains values (Names) for which checkbox is checked ...
It's very basic requirement ... It would be really helpful if someone provide sample code for this ..

[Rob Camick]

I want a list which contains values (Names) for which checkbox is checked ...

1) Create a loop
2) use the model.getValueAt(...) method to get the value from the column containing the Boolean value
3) if ( theValue.equals( Boolean.TRUE ) ) then get the Name from the model using the getValueAt() method for the current row and specific column.

[Rite Sara]

I am using the code similar to code posted in previous post and I am getting checkboxes in a table .. but not able to check(click) them ...

[Rob Camick]

I am using the code similar to code posted in previous post

I don't see your SSCCE posted anywhere that shows the similiar code. The key is to override the getColumnClass() method of the JTable or the model to return the proper class so the table can choose the proper renderer and editor to use.

[Rite Sara]

I don't see your SSCCE posted anywhere that shows the similiar code. .

Here I am posting my code again ...

   
import java.awt.*;       
import javax.swing.*;       
import javax.swing.table.*;       
     
public class TableTest extends JFrame       
{       
public TableTest()       
{           
     
String[] columnNames = {"checkbox","Description"};     
  
Object[][] data =       
{       
{new javax.swing.JCheckBox() , "test"},     
};       
     
DefaultTableModel model = new DefaultTableModel(data, columnNames);       
JTable table = new JTable( model )       
{       
// Returning the Class of each column will allow different       
// renderers to be used based on Class       
public Class getColumnClass(int column)       
{       
return getValueAt(0, column).getClass();       
}       
};       
     
table.setDefaultRenderer(Component.class, new MyCellRenderer());    
  
table.setPreferredScrollableViewportSize(table.getPreferredSize());       
     
JScrollPane scrollPane = new JScrollPane( table );       
getContentPane().add( scrollPane );       
}       
     
class MyCellRenderer implements TableCellRenderer       
{       
public Component getTableCellRendererComponent(JTable table,       
Object value,       
boolean isSelected,       
boolean hasFocus,       
int row,       
int column)       
{       
Component com = (Component)value;       
return com;       
}       
     
}       
     
public static void main(String[] args)       
{       
TableTest frame = new TableTest();       
frame.setDefaultCloseOperation( EXIT_ON_CLOSE );       
frame.pack();       
frame.setVisible(true);       
}       
 

I am overriding getColumnClass() here.. and I am getting checkboxes in the column ...
But the issue is I am not able to check them .

[Rob Camick]

How is your code like the demo code from the tutorial?

Where in the demo code:

a) is a custom renderer used?
b) is a JCheckBox added to the model?

Start with a working example and make changes to the working code 1 at a time. Then if is stops working you know what you changed to cause the problem.

[Rite Sara]

This is working example only ... Yes..its from tutorial ...but I have implemeted same way in my code ...
Given below are the steps showing the way I am implementing ...

1st ...
I am making object array with checkboxes .. and adding it to model ...

Object[][] data =
{
{new javax.swing.JCheckBox() , "test"},
};

DefaultTableModel model = new DefaultTableModel(data, columnNames);

2nd..
Implementing getColumnClass()

JTable table = new JTable( model )
{
public Class getColumnClass(int column)
{
return getValueAt(0, column).getClass();
}
};

3rd..
Implementing table cell renderer

class MyCellRenderer implements TableCellRenderer
{
public Component getTableCellRendererComponent(JTable table,
Object value,
boolean isSelected,
boolean hasFocus,
int row,
int column)
{
Component com = (Component)value;
return com;
}

}

4th..

fuction call to
table.setDefaultRenderer(Component.class, new MyCellRenderer());

As I said earlier...I am getting checkboxes in the column ...
But the issue is I am not able to check or select them ...

[Rob Camick]

The tutorial does NOT:

a) add a JCheckBox to the model (look at the code to see what they use)
b) use a custom renderer (get rid of this code)

[Rite Sara]

Hey .. I got the code.. It's working fine now.. ... Posting the code for reference ...

    
import java.awt.*;   
import javax.swing.*;   
import javax.swing.table.*;   
import java.awt.event.*;   
public class JTableHeaderCheckBox   
{   
  Object colNames[] = {"", "String", "String"};   
  Object[][] data = {};   
  DefaultTableModel dtm;   
  JTable table;   
  public void buildGUI()   
  {   
    dtm = new DefaultTableModel(data,colNames);   
    table = new JTable(dtm);   
    for(int x = 0; x < 5; x++)   
    {   
      dtm.addRow(new Object[]{new Boolean(false),"Row "+(x+1)+" Col 2","Row "+(x+1)+" Col 3"});   
    }   
    JScrollPane sp = new JScrollPane(table);   
    TableColumn tc = table.getColumnModel().getColumn(0);   
    tc.setCellEditor(table.getDefaultEditor(Boolean.class));   
    tc.setCellRenderer(table.getDefaultRenderer(Boolean.class));   
    tc.setHeaderRenderer(new CheckBoxHeader(new MyItemListener()));   
    JFrame f = new JFrame();   
    f.getContentPane().add(sp);   
    f.pack();   
    f.setLocationRelativeTo(null);   
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);   
    f.setVisible(true);   
  }   
  class MyItemListener implements ItemListener   
  {   
    public void itemStateChanged(ItemEvent e) {   
      Object source = e.getSource();   
      if (source instanceof AbstractButton == false) return;   
      boolean checked = e.getStateChange() == ItemEvent.SELECTED;   
      for(int x = 0, y = table.getRowCount(); x < y; x++)   
      {   
        table.setValueAt(new Boolean(checked),x,0);   
      }   
    }   
  }   
  public static void main (String[] args)   
  {   
    SwingUtilities.invokeLater(new Runnable(){   
      public void run(){   
        new JTableHeaderCheckBox().buildGUI();   
      }   
    });   
  }   
}   
class CheckBoxHeader extends JCheckBox   
    implements TableCellRenderer, MouseListener {   
  protected CheckBoxHeader rendererComponent;   
  protected int column;   
  protected boolean mousePressed = false;   
  public CheckBoxHeader(ItemListener itemListener) {   
    rendererComponent = this;   
    rendererComponent.addItemListener(itemListener);   
  }   
  public Component getTableCellRendererComponent(   
      JTable table, Object value,   
      boolean isSelected, boolean hasFocus, int row, int column) {   
    if (table != null) {   
      JTableHeader header = table.getTableHeader();   
      if (header != null) {   
        rendererComponent.setForeground(header.getForeground());   
        rendererComponent.setBackground(header.getBackground());   
        rendererComponent.setFont(header.getFont());   
        header.addMouseListener(rendererComponent);   
      }   
    }   
    setColumn(column);   
    rendererComponent.setText("Check All");   
    setBorder(UIManager.getBorder("TableHeader.cellBorder"));   
    return rendererComponent;   
  }   
  protected void setColumn(int column) {   
    this.column = column;   
  }   
  public int getColumn() {   
    return column;   
  }   
  protected void handleClickEvent(MouseEvent e) {   
    if (mousePressed) {   
      mousePressed=false;   
      JTableHeader header = (JTableHeader)(e.getSource());   
      JTable tableView = header.getTable();   
      TableColumnModel columnModel = tableView.getColumnModel();   
      int viewColumn = columnModel.getColumnIndexAtX(e.getX());   
      int column = tableView.convertColumnIndexToModel(viewColumn);   
    
      if (viewColumn == this.column && e.getClickCount() == 1 && column != -1) {   
        doClick();   
      }   
    }   
  }   
  public void mouseClicked(MouseEvent e) {   
    handleClickEvent(e);   
    ((JTableHeader)e.getSource()).repaint();   
  }   
  public void mousePressed(MouseEvent e) {   
    mousePressed = true;   
  }   
  public void mouseReleased(MouseEvent e) {   
  }   
  public void mouseEntered(MouseEvent e) {   
  }   
  public void mouseExited(MouseEvent e) {   
  }   
}