Adding JComboBox to a JTable cell [duplicate]

Question

Possible Duplicate:
How to add a JComboBox to a JTable cell?

I'm finding it difficult to add JComboBox to one of the cells of a JTable, I tried the code below but it's not working..

How can I add jcombobox to a particular cell?

On pressing enter a new jcombobox should be added automatically to the desired column.

jTable1 = new javax.swing.JTable();
mod=new DefaultTableModel();
mod.addColumn("No");
mod.addColumn("Item ID");
mod.addColumn("Units");
mod.addColumn("Amount");
mod.addColumn("UOM");
mod.addColumn("Delivery Date");
mod.addColumn("Total Amount");
mod.addColumn("Notes");
mod.addColumn("Received");
mod.addRow(new Object [][] {
        {1, null, null, null, null, null, null, null, null}
    });
jTable1.setModel(mod);
jTable1.getColumnModel().getColumn(1).setCellEditor(new DefaultCellEditor(generateBox()));
jTable1.setColumnSelectionAllowed(true);


Code to generate ComboBox

private JComboBox generateBox()
 {
     JComboBox bx=null;
     Connection con=CPool.getConnection();
     try
     {
         Statement st=con.createStatement();
         String query="select distinct inid from inventory where company_code="+"'"+ims.MainWindow.cc+"'";
         ResultSet rs=st.executeQuery(query);
         bx=new JComboBox();
         while(rs.next()){
             bx.addItem(rs.getString(1));
         }
         CPool.closeConnection(con);
         CPool.closeStatement(st);
         CPool.closeResultSet(rs);
     }catch(Exception x)
     {
         System.out.println(x.getMessage());
     }
             return bx;

 }

Evapotranspiration

Did you take a look at the already asked questions? Look at the links on the right of your question, many of them match exactly what you are asking for. – Willful

existing question – Becky

Answer 1

Look at this link it will help you

http://docs.oracle.com/javase/tutorial/uiswing/components/table.html

and the code :

http://docs.oracle.com/javase/tutorial/uiswing/examples/components/TableRenderDemoProject/src/components/TableRenderDemo.java

Vladivostok

Instead of posting a link to such a large page you could simply post the code: table.getColumnModel().getColumn(2).setCellEditor(new DefaultCellEditor(myComboBox)); where you obvioulsy load myComboBox with your drop down values. – Jeaz

@Jeaz I agree with you! I've been hit by the, "Why don't you just read this massive textbook of a link, you lazy person?" comment before as well. Not only is it unhelpful, it's discouraging. – Xenia

small follow up question, how do I make the height of the row adapt to that of the combo box. Now the first line doesn't fit perfectly while selecting. – Aeneus

with this example the cell looks like a combo box when you click it and are actively editing however otherwise it appears as a regular cell. I feel it is desired to have a way that the editor and renderer both appear as a combo box – Kwakiutl

Answer 2

JComboBox is added to JTable by extending DefaultCellEditor

Example:

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

/**
   Custom class for adding elements in the JComboBox.
*/
public class CustomComboBoxEditor extends DefaultCellEditor {

  // Declare a model that is used for adding the elements to the `Combo box`
  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) {
      // Add the elements which you want to the model.
      // Here I am adding elements from the orderList(say) which you can pass via constructor to this class.
      model.addElement(orderList.get(i));

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

By using a custom class to create Components in JTable you can have more control over the content which your are showing.

Talithatalk

Shouldn't you clear the model first before adding stuff to it? Also, you have one too many } after model.addElement() I think... – Waterspout

Why so complicated?? No additional class is needed: table.getColumnModel().getColumn(2).setCellEditor(new DefaultCellEditor(myComboBox)); where you obvioulsy load myComboBox with your drop down values. – Jeaz

@Jeaz coming back to it, it actually answers the "specific cell" part of the question, when the combobox content is different for each row. – Waterspout

@Talithatalk Where does orderList.get(i) come from? Eclipse tells me that I need to define orderList and i. – Xenia

@Xenia We need to create model for this table via a list. See my other anser here https://mcmap.net/q/905039/-create-jtable-from-arraylist. This might help you. – Talithatalk