CardLayout - opening 'new instance' each time a button is pressed

Hey, i have a jframe witch has 2 buttons with 2 jpanel cards.
Each time i press a button a different card shows.

1st card displays values from database.
2nd card has textfields that import values into database.

My problem - when i submit values from 2nd card, and press button to switch to 1st card - it doesnt show the just imputed values. I need to make a 'update card1 thing'.
If i close my application, and run it again, those values will show in card1.

I think if i make it so each time i press a button, a new instance of the card would show, it would display those just imputed values. Also i think i could make a 'update' method, but that would be too complicated for me, so i think making a new instance would be easier..

This is the part of the code that opens the cards:

Code:

---

    private void ButtonActionPerformed(java.awt.event.ActionEvent evt) {                                                   
      CardLayout card = (CardLayout) displayPanel.getLayout();
      card.show(displayPanel, "card1");
    }

---

I think i just need to write a small code somewhere here to open a 'new' card each time, can someone help me with this code please?

Why did you open another thread for the same problem again?

kind regards,

Jos

its a different one , that one was solved:
i needed to refresh textfields, for example - if i had a textfield in card 2 and entered something into it, then clicked to open card1 and clicked back to open card2, the textfield still had what i wrote earlier in it.. it was solved simply by adding a new method to change the textfields values into " " each time that card was opened.

in this problem i need to refresh the content from a database (got a table that displays all the data from a database), not to change textfields..

anyways, if u can then delete this thread ill write in that one..

This is a different question alright, but it is similar to your other question; you wanted to clear certain fields in a 'card' and now you want to update them. Keep track of those fields (i.e. don't just dump them in a panel in a card layout and forget all about them) and after the update, also update the values of those fields.

kind regards,

Jos

I watched a tutorial where my problem is fixed by putting the method that populates table with data, in the button that writes data.

I tried doing so but it didnt work (no errors either)..

Heres what i did:

1) located the method in jPanel1 (card1) that populates my combobox with data from database:

Code:

---

    public void fillComboBox(){   
        try {
        String sql = "SELECT * FROM Table1";
        pst = conn.prepareStatement(sql);
        rs = pst.executeQuery(sql);
        while (rs.next()){
        String values_from_table1 = rs.getString("table1_name");
        ComboBox.addItem(values_from_table1 );
      } 
        } catch (Exception e) {
          JOptionPane.showMessageDialog(null, e);
        }
    }

---

2) After reading a tutorial on how to call 1 method from 1 class to another, i did this:
Went to jPanel2 (card2), where the textfield that writes values to database is located, and created this:

Code:

---

jPanel1 methodsFromPanel1 = new jPanel1();

---

With this i can call all methods from jPanel1.

3) Then i located the button in jPanel2 (card2) that sends data to dabase, and called the method from jPanel1 (card1) ('methodsFromPanel1.fillComboBox();'):

Code:

---

    private void ButtonActionPerformed(java.awt.event.ActionEvent evt) {                                                           
    if (TextField.getText().isEmpty()) {
        infoLabel.setText("Textfield is empty");
    } else {
        try {
          String sql = "INSERT into Table1(table1_name) values (?)";
          pst = conn.prepareStatement(sql);
          pst.setString(1, TextField.getText());
          pst.execute();
          infoLabel.setText("Data saved");
        } catch (Exception e) {
          JOptionPane.showMessageDialog(null, e); 
        } 
        methodsFromPanel1.fillComboBox();
    }   
    }

---

Nothing happened, no errors , no refresh :(

I think my calling of methods from jPanel1 are wrong..
How do i call methods from jPanel1 in jPanel2? the one i used above this post doest seem to work..

I need to call this (located in jPanel1):

Code:

---

public void fillComboBox(){   
    try {
    String sql = "SELECT * FROM Table1";
    pst = conn.prepareStatement(sql);
    rs = pst.executeQuery(sql);
    while (rs.next()){
    String values_from_table1 = rs.getString("table1_name");
    ComboBox.addItem(values_from_table1 );
  } 
    } catch (Exception e) {
      JOptionPane.showMessageDialog(null, e);
    }
}

---

And just put it here (located in jPanel2):

Code:

---

private void ButtonActionPerformed(java.awt.event.ActionEvent evt) {                                                           
if (TextField.getText().isEmpty()) {
    infoLabel.setText("Textfield is empty");
} else {
    try {
      String sql = "INSERT into Table1(table1_name) values (?)";
      pst = conn.prepareStatement(sql);
      pst.setString(1, TextField.getText());
      pst.execute();
      infoLabel.setText("Data saved");
    } catch (Exception e) {
      JOptionPane.showMessageDialog(null, e); 
    } 
    fillComboBox(); // <------- need to put this method from panel1, dont know how..
}   
}

---

how do i do that?

Edit:
If i write the same method in panel2, and create a combobox there, it would refresh each time i submit a new value (tested it).

still havent fixed this problem, noone can help?

So jPanel2 will need a reference to jPanel1.
Then you'd call jPanel1.fillComboBox().

Though, from a design perspective, none of this should be in your GUI anyway.
But that's a separate issue really, and something you can learn about later.

I think ill try to explain my problem more detailed:

So i have jFrame1 , witch has two buttons that when i click on, they open jPanel1 (button1), or jPanel2 (button2).

In jPanel1, is a textfield where i write value and it stores into a database.

In jPanel2, is a combobox that reads data from a database and displays it.

What i want - when i enter value in jPanel1, then click on button2, that value would already be displayed in jPanel2 combobox.
What i have now - it just writes the data, and displays it only when i restart the app.
What i tried - tried calling a method from jPanel2 that populates the combobox. I called this method in my jFrame1 in the button2 actionperformed place. (not working).

Here is how i tried calling that method (witch is bad i think, thats why it doesnt work):
1st) created a reference to jPanel2 in jFrame1:
jPanel2 methodsFromJpanel2= new jPanel2 ();
2nd) called the method that fills combobox in jPanel2 in my button2 actionperformed:

Code:

---

private void button2ButtonActionPerformed(java.awt.event.ActionEvent evt) {                                                   
      CardLayout card = (CardLayout) displayPanel.getLayout();
      card.show(displayPanel, "card2");
      methodsFromJpanel2.fillsComboBox();  //<- where i called it

---

So every time i press button2, it would update the combobox in jpanel2.
Doing this didnt show any errors, it didnt do anything.

Also i tried calling the method w/o making this (jPanel2 methodsFromJpanel2= new jPanel2 ();). I wrote this in my button2:

Code:

---

private void button2ButtonActionPerformed(java.awt.event.ActionEvent evt) {                                                   
      CardLayout card = (CardLayout) displayPanel.getLayout();
      card.show(displayPanel, "card2");
      jPanel2.fillsComboBox();  //<- where i called it

---

I couldnt run my app, showed this error - 'non-static method fillComboBox() cannot be referenced from a static content'.

You need the actual JPanel object.
You can't just create another one.

You also need to use standard naming conventions, as jPanel2 implies it is an object not a class. It should be JPanel2 if it is a class.
And, further to that, it should have a proper, descriptive, name.

Anyway, how are you building the JFrame and these panels?

Im using cardlayout, jFrame1 holds display panel and buttons panel. Then i create other jpanels and put them as cards..
Also my panel names and frame names are not named jPanel1 jFrame1 etc, i just show here to make it more simple

Edit: im reading something about revalidate(); for cardlayout, might be it

So you need the reference to the actual jPanel.
I don't know any other way to describe this.