JTextArea Document Listener updating text

Question

I have a JTextArea and I'd like to listen when the user pastes text in the JtextArea. Specifically, I'd like to do the following:

Get the text they pasted, remove whitespaces, and replace the JTextArea text with the edited text without spaces (rather than the original text the user pasted).

How can I do this using a DocumentListener, and avoiding java.lang.UnsupportedOperationException: Not supported yet., which comes as a result of the following code:

public void insertUpdate(DocumentEvent de) {

        final String replace = jTextArea1.getText().replaceAll("\\s","");

        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
            jTextArea1.setText(replace);
            }
         });

    }

What's the stack trace from that exception? This seems like it should work. Unless there's some prohibition of re-setting the text from within the event handler, in which case you could try a `SwingUtilities.invokeLater()` call. — Rob I, Jun 05 '12 at 19:22
I tried SwingUtilities.invokeLater (see updated question). The error is still thrown. — CodeGuy, Jun 05 '12 at 19:25
Can you post the stack trace? It's not clear (to me) what's causing the error. — Rob I, Jun 05 '12 at 19:31

score 1 · Accepted Answer · edited May 23 '17 at 12:28

1

I haven't any issue with method insertUpdate(DocumentEvent documentEvent), sure JTextArea can accepting only chars input, if you'll have an issue use JEditorPane, there you can importing another Java AWT and Swing Objects too

code example

private DocumentListener docListener = new DocumentListener() {

    @Override
    public void changedUpdate(DocumentEvent documentEvent) {
        printIt(documentEvent);
    }

    @Override
    public void insertUpdate(DocumentEvent documentEvent) {
        printIt(documentEvent);
    }

    @Override
    public void removeUpdate(DocumentEvent documentEvent) {
        printIt(documentEvent);
    }

    private void printIt(DocumentEvent documentEvent) {
        DocumentEvent.EventType type = documentEvent.getType();
        //your code
    }
};

for replacing inserted characters you have to add DocumentFilter

edited May 23 '17 at 12:28

Community

1
1

answered Jun 05 '12 at 19:23

mKorbel

109,525
20
134
319

However if you try to say textArea.setText(textArea.getText().replaceAll("\\s","")) you get the area I put in the question – CodeGuy Jun 05 '12 at 19:25
so I just need to call another function to do it, rather than put the setText() inside the changeUpdate function? – CodeGuy Jun 05 '12 at 19:29
[here you can see basic rules](http://stackoverflow.com/a/9692926/714968), and then you can combine both Listeners (sure by leaving insertUpdate in DocumentListener empty) – mKorbel Jun 05 '12 at 19:34

score 0 · Answer 2 · answered Jun 05 '12 at 19:29

0

If you would like remove white character use \S or \s in regexp. If you woudlike to remove only space you may do it in this same way. Read more about regexp: http://docs.oracle.com/javase/1.4.2/docs/api/java/util/regex/Pattern.html

answered Jun 05 '12 at 19:29

user902691

1,149
4
20
46

I already am removing the whitespace. Please read the question, for it is not the problem. – CodeGuy Jun 05 '12 at 19:30

JTextArea Document Listener updating text

2 Answers2