Question

How to use property change events on a JTextField

Asked by: Suppai

For some reason I can't make the JTextFields fire the property change events when changing the text in the textfields. I followed a guide used on JFormattedTextField on sun.com, but maybe its not the same concept? I have attached the non working code:

//init
north.add(new JLabel("Address"));
addrText = new JTextField(link.getAddress(),30);
addrText.addPropertyChangeListener("value", this);
north.add(addrText);
north.add(new JLabel("Port"));
portText = new JTextField(String.valueOf(link.getPort()),5);
portText.addPropertyChangeListener("value", this);
north.add(portText);
//the propertyChange implementation 
public void propertyChange(PropertyChangeEvent evt) {
       Object source = evt.getSource();
       if (source == addrText) {
            link.setAddress(addrText.getText());
        } else if (source == portText) {
            try {
            	link.setPort(Integer.parseInt(portText.getText()));
           } catch (NumberFormatException e) {
	portText.setText((String)evt.getOldValue());
           }         	
       }}

                                  
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Asked On
2009-02-19 at 04:46:31ID24157787
Tags

Java

,

Swing

Topics

Java AWT & Swing

,

Java Programming Language

,

New to Java Programming

Participating Experts
1
Points
500
Comments
7

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Answers

 

by: ksivananthPosted on 2009-02-19 at 04:50:17ID: 23680658

I think, that get fired only when you call setValue method!

in this case, you may want to use the FocusListeners!

 

by: ksivananthPosted on 2009-02-19 at 04:53:16ID: 23680687

or DocumentListener

 

by: SuppaiPosted on 2009-02-19 at 04:58:11ID: 23680739

So how would I do it if I want an event to fire when the has inputted a new value and removed focus from the textfield?

 

by: ksivananthPosted on 2009-02-19 at 04:59:05ID: 23680751

yes!

 

by: ksivananthPosted on 2009-02-19 at 05:00:09ID: 23680763

 

by: ksivananthPosted on 2009-02-19 at 05:15:24ID: 23680908

you can use the DocumentListener also,

class MyDocumentListener implements DocumentListener {
    public void insertUpdate(DocumentEvent e) {
        setValue(e);
    }
    public void removeUpdate(DocumentEvent e) {
        setValue(e);
    }
    public void changedUpdate(DocumentEvent e) {
        // we won't ever get this with a PlainDocument
    }
    private void setValue(DocumentEvent e) {
        Document whatsup = e.getDocument();
        if (whatsup.getProperty("name").equals("address"))
            link.setAddress( addrText.getValue() );
        else if (whatsup.getProperty("name").equals("port"))
            link.setPort( portText.getValue() );
    }
}    
        MyDocumentListener myDocumentListener = new MyDocumentListener();
        addrText.getDocument().addDocumentListener(myDocumentListener);
        addrText.getDocument().putProperty("name", "amount");
        portText.getDocument().addDocumentListener(myDocumentListener);
        portText.getDocument().putProperty("name", "amount");


 

by: SuppaiPosted on 2009-02-19 at 05:34:43ID: 31548730

That did the trick. thanks

20120131-EE-VQP-002

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