Java Textarea ScrollPane

Question

I have created a textarea, and i need a scrollbar applied to the textarea when necessary (when the text gets too long down and it cant be read anymore).

this is the code i have written, but for some reason, the scrollbar doesnt really come up?

    final JTextArea textArea = new JTextArea();
    textArea.setEditable(false);
    textArea.setBounds(10, 152, 456, 255);
    textArea.setBorder(border);
    textArea.setLineWrap(true);
    sbrText = new JScrollPane(textArea);
    sbrText.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
    panel_1.add(textArea);

Asked a second time for god-know's what reason: http://stackoverflow.com/questions/9624305/using-a-jscrollpane-with-a-jtextarea — Hovercraft Full Of Eels, Mar 08 '12 at 20:37

score 1 · Answer 1 · edited Mar 09 '12 at 00:40

1

You have to remove the code line that makes the JTextArea have absolute size on the screen due to using setBounds(). This makes it non-resizable, and JScrollPane works only if its content is resizable.
```
// wrong
textArea.setBounds(10, 152, 456, 255);
```
Please read JTextArea and JScrollPane tutorial; please run examples from both tutorials.

edited Mar 09 '12 at 00:40

trashgod

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answered Mar 08 '12 at 20:04

mKorbel

109,525
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what do you mean? you mean i need to get rid of Final? my textarea has to be final, as i am using that later in the code, and the code later requires the textarea to be final. is there any way, i can keep it final and add a scrollbar? – Pita Mar 08 '12 at 20:08

score 1 · Answer 2 · answered Mar 08 '12 at 20:09

see this

 import javax.swing.*;

    public class TestFrame extends JFrame

{
    JTextAreaWithScroll textArea;

    public TestFrame ()
    {
        super ("Test Frame");

        setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
        setSize (300, 300);

        textArea = new JTextAreaWithScroll (JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
                                            JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);

        add (textArea.getScrollPane ());
    }

    public static void main (String[] args)
    {
        SwingUtilities.invokeLater (new Runnable()
        {
            public void run ()
            {
                TestFrame f = new TestFrame ();
                f.setVisible (true);
            }
        });
    }
}


class JTextAreaWithScroll extends JTextArea
{
    private JScrollPane scrollPane;

    public JTextAreaWithScroll (int vsbPolicy, int hsbPolicy)
    {
        scrollPane = new JScrollPane (this, vsbPolicy, hsbPolicy);
    }

    public JScrollPane getScrollPane ()
    {
        return scrollPane;
    }
}

from http://forum.html.it/forum/showthread/t-1035892.html

This relies on the frame's content pane having a default `BorderLayout` and default destination `CENTER`. — trashgod, Mar 08 '12 at 20:46

score 0 · Answer 3 · answered Nov 15 '16 at 16:24

Make sure that the preferredSize and the viewportSize are the same. The scrollpane will size itself with the preferred size of the textArea, and this can cause the scrollbars to disappear if the preferred size of the text area is large enough to display itself.

Again, please read the JTextArea and JScrollPane tutorials.

textArea.setPreferredSize(new Dimension(456, 255));
textArea.setPreferedScrollableViewportSize(new Dimension(456, 255));

score 0 · Answer 4 · answered Mar 08 '12 at 20:07

0

You added the TextArea to a parent twice (scrollPane and panel). Change your last line to

panel_1.add(sbrText);

answered Mar 08 '12 at 20:07

Stanley F.

1,846
16
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I have tried that, but then the textarea isnt available on the frame anymore? – Pita Mar 08 '12 at 20:09
There's no frame in your example code. But for me it works this way. Maybe you have to change the layout of the panel. – Stanley F. Mar 08 '12 at 20:17
Well i have a frame and stuff, hence its not working your code. – Pita Mar 08 '12 at 20:17

Java Textarea ScrollPane

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