JTable won't scroll in JScrollPane

Question

I've been having trouble trying to get the table to scroll; it just won't. I've looked at other stack answers and tried them, but they aren't working; and I'm not sure if I have something conflicting with those solutions.

tableModel = new TableModel(); //Custom Table Model
table = new JTable();
table.setBorder(null);
table.setFillsViewportHeight(true);
table.setModel(tableModel);

JScrollPane tblScrollPane = new JScrollPane(table);
tblScrollPane.setBorder(new EtchedBorder(EtchedBorder.LOWERED, null, null));
tblScrollPane.setBounds(245, 17, 560, 425);
frmServerAdministration.getContentPane().add(tblScrollPane);

EDIT: More info

So a window opens, which is the server program. Client programs connect to the server and when they do, a method is triggered in my table model class which adds a new row into the table. (I can see the row) Then at the end of that method it calls another but nothing changes in the ScrollPane. Do I need to do some kind of repainting? -

Server.updateTableScroll();

public static void updateTableScroll() {
    System.out.println("Here"); //NOTE: I do see this printed out
    int last = table.getModel().getRowCount() - 1;
    Rectangle r = table.getCellRect(last, 0, true);
    table.scrollRectToVisible(r);        
}

EDIT 2: Thoughts

So in Eclipse I use Window Builder to make the GUI, and the following for loop will display the table with the scrollbar! But when I run the same addClient() method at another point, then the scroll bar won't appear.

public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                Server window = new Server();
                window.frmServerAdministration.setVisible(true);
                for(int i = 0; i < 20; i++){
                    tableModel.addClient(i, String.valueOf(i));
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}

score 4 · Accepted Answer · edited May 23 '17 at 12:20

4

Instead of setBounds(), override getPreferredScrollableViewportSize(), as suggested here, and pack() the enclosing top-level container. Also, the API authors "recommend that you put the component in a JPanel and set the border on the JPanel."

Addendum: As a JTable listens to its TableModel, verify that the correct event is fired from the model. If you extend AbstractTableModel, one of the fireTableXxx() methods will be appropriate.

edited May 23 '17 at 12:20

Community

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answered Aug 06 '13 at 00:01

trashgod

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This looks very useful, but I can't really follow it. Can you elaborate some? – Michael Scott Aug 06 '13 at 01:01
And, which component goes on the JPanel ? – Michael Scott Aug 06 '13 at 01:11
Here's a complete [example](http://stackoverflow.com/a/14429388/230513); if it's not helpful, please edit your question to include an [sscce](http://sscce.org/) that exhibits any problem you encounter. – trashgod Aug 06 '13 at 01:12
I sincerely appreciate your help. I'm trying to make an sscce but I have a lot of code so in the example, I am copying and pasting code but it's working in the example. Ug – Michael Scott Aug 06 '13 at 01:36
In my sscce example, I don't have to do anything to make the scrollbar appear. :(----EDIT-Okay nvm what I said about the example. I can get the same thing to happen in the original, but my original problem still exists. Ill keep working on an scce – Michael Scott Aug 06 '13 at 01:39
Compare my example to yours, or simply use mine. – trashgod Aug 06 '13 at 01:40
1

Verify that the custom table model fires the correct events to notify the table. – trashgod Aug 06 '13 at 02:06
I very new to tables and table models, so I'm not quite sure how I would go about that. Also, I added more to the question – Michael Scott Aug 06 '13 at 02:08

score 1 · Answer 2 · answered Aug 06 '13 at 02:17

1

All I needed to do was call this after I added data (I'm very new to table models :P ) this.fireTableStructureChanged();

answered Aug 06 '13 at 02:17

Michael Scott

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JTable won't scroll in JScrollPane

2 Answers2

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