how to set new text in JTextField after creation?

Question

I have a jTextField , and I set it's value to a certain sum when I create the frame.
Here is the initiation code:

totalTextField.setText(
            itemsPriceTextField.getText() +           
                    Float.toString(orderDetails.delivery)
);

This textfield should show a sum of items selected by the user.
The selection is done on a different frame, and both frames are visible / invisible at a time.
The user can go back and forth and add / remove items.

Now, every time i set this frame visible again, I need to reload the value set to that field
(maybe no changes were made, but if so, I need to set the new correct sum) .

I'm quite desperate with it.
Can anyone please give me a clue?
Thanks in advance! :)

Are you sure that you are not creating a new frame each time, instead of make it visible? — Federico Vera, Jun 14 '11 at 22:22
Yes I'm sure.. I keep pointers to previous frames and just move back and forth — Daniel Briskman, Jun 14 '11 at 23:03
whenever you are making the frame visible , aren't you using any listener event as you are making it visible when some operation happens — Abhishek Choudhary, Jun 15 '11 at 04:38
if you want to change text while you are in focus to the text field. then you cant do it this way — Shehan Hasintha, Aug 24 '20 at 15:00

score 10 · Answer 1 · edited Mar 10 '19 at 14:13

10

Before setting the frame visible again, one should update the fields with the new values / states.
something like:

jTextField.setText("put your text here");  
jRadioButton.setSelected(!isSelected());  
.  
/* update all you need */
.  
jFrame.setVisible(true);

The frame will come up with the new values / states.

edited Mar 10 '19 at 14:13

Viktor

2,623
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answered Jun 15 '11 at 20:31

Daniel Briskman

399
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11

if you want to change text while you are in focus to the text field. then you cant do it this way. – Shehan Hasintha Aug 24 '20 at 14:59

score 3 · Answer 2 · answered Jun 14 '11 at 23:57

3

Add a WindowListener to the frame. Then you can handle the windowActivated event and reset the text of the text field.

See How to Write Window Listeners.

answered Jun 14 '11 at 23:57

camickr

321,443
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288

score 0 · Answer 3 · answered May 11 '21 at 21:06

Use a DocumentListener triggering the JTextField public void setText(String t)

Here an example with DocumentListener:

public class SetTextInJTextField extends JFrame implements DocumentListener {

JTextField entry;
JTextField entryToSet = new JTextField();

public SetTextInJTextField() {
    createWindow();
    entry.getDocument().addDocumentListener(this);
}

private void createWindow() {
    JFrame frame = new JFrame("Swing Tester");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    createUI(frame);
    frame.setSize(560, 200);
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
}

private void createUI(final JFrame frame) {
    JPanel panel = new JPanel();
    entry = new JTextField();
    entryToSet = new JTextField();

    LayoutManager layout = new BoxLayout(panel, BoxLayout.PAGE_AXIS);
    panel.setLayout(layout);

    panel.add(this.entry);
    panel.add(entryToSet);
    frame.getContentPane().add(panel, BorderLayout.CENTER);
}

public void setTextInTargetTxtField() {
    String s = entry.getText();
    entryToSet.setText(s);
}

// DocumentListener methods
public void insertUpdate(DocumentEvent ev) {
    setTextInTargetTxtField();
}

public void removeUpdate(DocumentEvent ev) {
    setTextInTargetTxtField();
}

public void changedUpdate(DocumentEvent ev) {
}

public static void main(String args[]) {
    //Schedule a job for the event dispatch thread:
    //creating and showing this application's GUI.
    SwingUtilities.invokeLater(new Runnable() {
        public void run() {
            new SetTextInJTextField().setVisible(true);
        }
    });
  }
}

inspired from: https://docs.oracle.com/javase/tutorial/displayCode.html?code=https://docs.oracle.com/javase/tutorial/uiswing/examples/components/TextFieldDemoProject/src/components/TextFieldDemo.java

related lesson: https://docs.oracle.com/javase/tutorial/uiswing/components/textfield.html

how to set new text in JTextField after creation?

3 Answers3

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