Set Text to JText component on Applet

Hi CongUan

Are you updating the model when you change the value of the input? Can you post the code you do the update (you set the text)?

Cheers

you're trying to update the document in one of your listeners (DocListenerHandler), but as it is in the process of being editted you can't.

you should never update a document from a DocumentListener, instead try using a DocumentFilter.

Try to do the update from a different thread I'd say.

Yah, I think I understand these,
But how to set text with different thread, Please give me some suggestion with my code as below:

txtSeri.setDocument(new LengthLimitedDocument());
txtSeri.getDocument().addDocumentListener(new DocListenerHandler());

I implement  LengthLimitedDocument() because I want to limit the lengt of text of input, Do you have any way to limit the lengt of input  of jText?

After  insertOutInvoice(inputText) called, I want to set text txtSeri to "" (empty).

Can you have me agian?

class DocListenerHandler implements DocumentListener {

        public void changedUpdate(DocumentEvent arg0) {
            // TODO Auto-generated method stub
        }

        public void insertUpdate(DocumentEvent docEvent) {
            int lengthOfText = docEvent.getDocument().getLength();
            if (OutInvoice.BARCODE_LENGTH_LIMIT == lengthOfText) {
                try {
                    String inputText = docEvent.getDocument().getText(0,
                            lengthOfText);
//                                    printBarcode(inputText);
                    insertOutInvoice(inputText);
                } catch (Exception ex) {
                    ex.printStackTrace();
                }
            }

        }

        public void removeUpdate(DocumentEvent arg0) {
            // TODO Auto-generated method stub

        }
    }


    class LengthLimitedDocument extends PlainDocument {
        public void insertString(int offset, String str, AttributeSet attr) throws
                BadLocationException {
            if (str != null &&
                (getLength() + str.length()) <= OutInvoice.BARCODE_LENGTH_LIMIT) {
                super.insertString(offset, str, attr);
            }
        }

    }

> I implement  LengthLimitedDocument() because I want to limit the lengt of text of input, Do you have any way to limit the lengt of input  of jText?

thats fine, its your listener thats the problem

> After  insertOutInvoice(inputText) called, I want to set text txtSeri to "" (empty).

you cannot do that in a DocumentListener

th code u posted does not appear to be the same as what caused the error

Have a look here: http://forum.java.sun.com/thread.jspa?threadID=620748&tstart=75

Try

EventQueue.invokeLater(new Runnable()
{public void run() {
<your object>.setText("");
}
});

> EventQueue.invokeLater(new Runnable()

I'd be careful doing that in a doc listener

> > EventQueue.invokeLater(new Runnable()
> 
> I'd be careful doing that in a doc listener

Any thoughts as to why?

> why?

I meant why not?

cause your triggering an update event from another update event.
you should instead use a DocumentFilter

http://java.sun.com/docs/books/tutorial/uiswing/components/generaltext.html#filter

Hi, I try to do with

EventQueue.invokeLater(new Runnable()
{public void run() {
txtSeri.setText("");
}
});

but it cause the same problem.
Any help agian.
The below is all my code that cause the problem.

    txtSeri.setDocument(new LengthLimitedDocument());
    txtSeri.getDocument().addDocumentListener(new DocListenerHandler());


    protected void insertOutInvoice(String seriNumber) {
       /* SeriesNumber aSeriNumber = new SeriesNumber();
        aSeriNumber.setSeqNumber(outInvoiceList.size() + 1);
        aSeriNumber.setSeriCode(seriNumber);
        aSeriNumber.setProductName("KC36");
        outInvoiceList.add(aSeriNumber);
        tblObject.setOutInvoiceList(outInvoiceList);
        tblObject.refresh();
        pnTable.updateUI();
       */
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                txtSeri.setText("");
            }
        });
    }

    class DocListenerHandler implements DocumentListener {

        public void changedUpdate(DocumentEvent arg0) {
            // TODO Auto-generated method stub
        }

        public void insertUpdate(DocumentEvent docEvent) {
            int lengthOfText = docEvent.getDocument().getLength();
            if (OutInvoice.BARCODE_LENGTH_LIMIT == lengthOfText) {
                try {
                    String inputText = docEvent.getDocument().getText(0,
                            lengthOfText);
                    insertOutInvoice(inputText);
                } catch (Exception ex) {
                    ex.printStackTrace();
                }
            }

        }

        public void removeUpdate(DocumentEvent arg0) {
            // TODO Auto-generated method stub

        }
    }


    class LengthLimitedDocument extends PlainDocument {
        public void insertString(int offset, String str, AttributeSet attr) throws
                BadLocationException {
            if (str != null &&
                (getLength() + str.length()) <= OutInvoice.BARCODE_LENGTH_LIMIT) {
                super.insertString(offset, str, attr);
            }
        }

    }

> cause your triggering an update event from another update event.

Yes, but won't this update go to the end of the event queue? It will only happen when the first update has finished.

> you should instead use a DocumentFilter

TBH I've never used a DocumentFilter, I guess it's a solution as well.

>>insertOutInvoice(inputText);

What does 'insertOutInvoice' actually do?

using a filter your method would look something like:

public void insertString(DocumentFilter.FilterBypass fb, int offset, String string, AttributeSet attr) {
    int lengthOfText = fb.getDocument().getLength();
    if (OutInvoice.BARCODE_LENGTH_LIMIT == lengthOfText) {
    try {
        fb.remove(0, lengthOfText);
    } catch (Exception ex) {
        ex.printStackTrace();
    }
    }
}