Develop Reference

Editing JList in a JTable

I have a JTable whose every cell contains a JList. What I want to do is to make that table editable so that every item on the JList can be edited either using a JTextfield or Choosing an item from another List whenever the user right clicks on that list item in a particular table cell. I also want 2 of my table column need to be set uneditable. Here is a picture of my JTable. I want the every cell and every JList item on that cell to be editable leaving the 'Batch' and 'Break' column to be uneditable.
P.S. I don't want any spoon fed code. I just want an idea how it can be done. And I'll be really grateful if you can reference me some link on the web where I can read to learn how this type of problems can be solved. Thank you..!
enter image description here

AutoCompleteDecorator.decorate(combobox); is not working perfectly in JTable

I'm using A JCombobox with editable = true in a JPanel and using a JTable in the same panel with a column that is set to show combobox as its field type. I applied
AutoCompleteDecorator.decorate(cb);
to JCombobox that is outside the JTable and its working perfectly But when I applied the same line of code to combobox within jtable which selects the first occurrence of the data that match the key typed.
How can I resolve this issue. Any Suggestion ?
Look at the image below in which the exact item is selected that I typed.
And this is the image of combobox within JTable.
When I press w key it select the first occurrence windy and set it in the cell.

You haven't posted a code, but have you checked which TableCellEditor you use?
You might have used DefaultTableCellEditor. Change it to ComboBoxCellEditor if that's the case.
example:
JCombobox cmbItems = new JComboBox();
cmbItems.addItem("choice1");
cmbItems.addItem("choice2");
cmbItems.addItem("choice3");
AutoCompleteDecorator.decorate(cmbItems);
TableColumn colWithCmb = table.getColumnModel().getColumn(0);
colWithCmb.setCellEditor(new ComboBoxCellEditor(cmbItems));

Displaying just one value in JComboBox when one is selected

Hello :) I need help with changing a JComboBox in a JTable. I'm new to GUI-Programming and Swing and couldn't solve this problem: I have to change the behavior of a JComboBox.
You can see the ComboBox in the picture below. If "Ja" is selected there should just be "Nein" as an option and the other way around. It would also be cool if "Nein" is set per default. The code was written from one student from last semester and I have difficulties to adjust the combobox like I have to.
That's the code snippet where the ComboBox gets initialized.
optionsInteger = new JComboBox<String>();
optionsInteger.addItem("Ja");
optionsInteger.addItem("Nein");
optionsInteger.setSelectedItem(optionsInteger.getItemAt(0));
optionsInteger.setSelectedIndex(1);
optionsInteger.setName("optionsInteger");
The ComboBox gets inserted to a JTable in this method:
public void repaintXTable(DefaultTableModel model,JTable table, int xAmount, JScrollPane scrollPane,
JComboBox<String> optionsInteger) {
model.setRowCount(xAmount);
th = table.getTableHeader();
tcm = th.getColumnModel();
tcs = tcm.getColumns();
tcs.nextElement().setHeaderValue("");
tcs.nextElement().setHeaderValue("Lower");
tcs.nextElement().setHeaderValue("Upper");
tc = tcs.nextElement();
tc.setHeaderValue("Integer");
tc.setCellEditor(new DefaultCellEditor(optionsInteger));
for(int i=0;i<xAmount;i++)
{
model.setValueAt("X"+(i+1), i, 0);
}
}
Thank you very much for your help.

In your code, this line
optionsInteger.setSelectedItem(optionsInteger.getItemAt(0));
sets the default selection to the zeroth element (Ja). This line
optionsInteger.setSelectedIndex(1);
sets the default selection to the first element (Nein).
Either set the selected item or the selected index. There's no need to do both.
A JComboBox does not remove the selected element by default. If the selected element is removed, how would the selected element display in your JTable?
If you really want to do this, you'll have to create your own version of a JComboBox.

. If "Ja" is selected there should just be "Nein" as an option and the other way around.
So then you need two separate ComboBoxModels, one model containing "Nein" and the other containing "Ja". Then when you start to edit the cell you check the current value and use the model containing the other value.
Check out How to add unique JComboBoxes to a column in a JTable (Java). This example shows how you can dynamically change the model at the time the cell is about to be edited.
It would also be cool if "Nein" is set per default.
This has nothing to do with the editor. You just add "Nein" to the TableModel when you add the data to the model.

Is a custom TableCellEditor constructor only called once?

I have a JTable. One column in the JTable is assigned an extended TableCellEditor that displays an extended JComboBox.
There is a fixed list of 100 String objects that populates the comboboxes.
The challenge:
Design the JComboBoxes so that any selection is unique relative to other boxes? That is, if "A" is slected from the combobox in the first row, it is automatically removed from the list of each other combobox.
When a new room is added to the table, the combobox it contains should auto-populate to the first available list item.
The problem:
My comboboxes work beautifully. I can select items at will. I even have made some progress in eliminating already used items from the lists. But I can't figure out how to correctly auto-populate.
I am very confused because it appears that my combobox constructor is only called once when the table is created, not once for each row.
Is this the case? Is the constructor for a TableCellEditor only called once ever? If so, how do I modify the behavior of each combobox as it come into existence?
Thanks for your help!
If you would like specific code, please let me know. I don't know if you want me to paste in the whole classes.

When a new room is added to the table, the combobox it contains should auto-populate to the first available list item.
When you add a new row of data to the TableModel you must add the values of all columns in the row. This should not be a function of the editor. The editor allows you to change values in the cell.

I was able to get around my problem by creating an abstract superclass for my combobox that can be accessed from the tablemodel extension when it sets up its data.

creating comboboxes inside jtable

My aim is to provide an interface like a matrix, each cell in matrix will have 2 values and user will select best among the two.
So i thought of going for jTable and combo boxes, the problem is in my matrix the value of each cell in a column is different. But the following code that adds the combo box to whole column of the table and if i change the combo box value, it changes for the whole table. How to insert combo boxes into the table such that each one has different values
javax.swing.JComboBox k = new javax.swing.JComboBox();
k.addItem("1");
k.addItem("2");
k.addItem("3");
k.setEnabled(true);
k.setVisible(true);
this.jTable1.getColumnModel().getColumn(0).setCellEditor(new DefaultCellEditor(k));
I also tried with DefaultTableModel
code is
DefaultTableModel t =new javax.swing.table.DefaultTableModel();
t.setColumnCount(10);
t.setRowCount(10);
t.setValueAt(k, 0, 0);
jTable1.setModel(t);
but i get the output in the gui as
javax.swing.JComboBox[,0,0,0x0,invalid,layout=javax.swing.plaf.metal.MetalComboBoxUI$MetalComboBoxLayoutManager,alignmentX=0.0,alignmentY=0.0,border=,flags=16777544,maximumSize=,minimumSize=,preferredSize=,isEditable=false,lightWeightPopupEnabled=true,maximumRowCount=8,selectedItemReminder=1]
I tried typecasting "k" as JComboBox and JComponent in setValueAt method, which didn't work
Someone please help

Override the getCellEditor(....) method. For example: How to add unique JComboBoxes to a column in a JTable (Java)