How to reload JInternalFrame

[chyrl]

Greetings,

I'm confused on how to reload my JInternalFrame upon updating a record in my database.

My CUD (Create, Update, Delete) codes are functioning well. But after each function, the components won't update. Since I've tried using addItem() and removeItem() for my JComboBox but, I have ruined the order of the items.

All I want to happen is after CUD of the JIF, the JIF will reload itself.

The Source Code is placed in my previous thread.
Click Here

Thanks.

[DarrylBurke]

Why the double post?
How to refresh my JInternalFrame upon CUD

db

[chyrl]

I'm despirate to find the solution.
I have already triple posted this thread.

Sorry for that.

[j2me64]

but, I have ruined the order of the items.

for keeping the order in the list use the method insertItemAt(Object, index); you have to calculate the index in your code.

JComboBox (Java 2 Platform SE v1.4.2), int)

i wrote a small demoexample for you to demostrate how to cud. it has less logic in it but it demostrates cud works. so the initial combobox contains

item1
ite2
item4

pushing the creeate button, a item3 is inserted after ite2 (hard-coded, calculate the right place where to insert in your code). pushing update the ite2 is updated to item2 and finally pushing delete the item4 is deleted. push it only once, otherwise you will throw a ArrayIndexOutofBoundsException. here is the code for the jcombobox

package Employee;

import java.awt.BorderLayout;
import java.util.Vector;

import javax.swing.DefaultComboBoxModel;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.WindowConstants;
import javax.swing.event.MenuListener;

public class ComboBoxExample extends JFrame {
	private DefaultComboBoxModel myModel;
	private JComboBox myComboBox;

	public ComboBoxExample() {
		// JComboBox
		myComboBox = new JComboBox();
		JPanel south = new JPanel();
		
		JButton create = new JButton("Create");
		JButton update = new JButton("Update");
		JButton delete = new JButton("Delete");
		

		
		
		south.add(create);
		south.add(update);
		south.add(delete);
		
		Vector<String> myItems = new Vector<String>();
		myItems.add("item1");
		myItems.add("ite2");
		myItems.add("item4");
		myModel = new DefaultComboBoxModel(myItems);
		
		myComboBox.setModel(myModel);
		
		MyActionListener listener = new MyActionListener(myModel);
		create.addActionListener(listener);
		update.addActionListener(listener);
		delete.addActionListener(listener);
		
		// add ComboBox to Frame
		
		this.getContentPane().add(myComboBox, BorderLayout.NORTH);
		this.getContentPane().add(south, BorderLayout.SOUTH);
		this.pack();
		this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
		this.setVisible(true);

	}

	public static void main(String[] args) {
		new ComboBoxExample();
	}
}

here is the code with the button listener

package Employee;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.DefaultComboBoxModel;

public class MyActionListener implements ActionListener {

	private DefaultComboBoxModel comboModel;

	public MyActionListener(DefaultComboBoxModel newModel) {
		this.comboModel = newModel;
	}

	public void actionPerformed(ActionEvent ev) {
		String str = ev.getActionCommand();
		// create new item
		if (str.equals("Create")) {
			this.comboModel.insertElementAt("item3", 2);
			// update ite2 to item2
		} else if (str.equals("Update")) {
			this.comboModel.removeElementAt(1);
			this.comboModel.insertElementAt("item2", 1);
		} else if (str.equals("Delete")) {
			// deletes item3
			System.out.println("delete");
			this.comboModel.removeElementAt(3);
		}
	}
}

i hope you understand the mecchano, otherwise ask. if you have a lot of inserts and updates it's perhaps easier to remove all items and rebuild the coplete list from scratch. but if you have simple changes you have only to change the item in the ComboBoxModel and the JComboBox is automatically rebuild.

[chyrl]

Ok. But is there a way to refresh the JIF?
Refreshing or reloading the JIF will be more appreciated than logically adjusting the lists of JComboBox.

[Michael Dunn]

> Ok. But is there a way to refresh the JIF?

I don't know what you explicitly mean by 'refresh'.
you mentioned a refresh function in your other post - I didn't see
a method of that name (although it was only a cursory glance).

I can't run your code because you have db stuff that refers to a database I don't have.

what you need to do, if you really want people to have a look at your problem is:
1) post a compilable/runnable sample program with hard-coded data,
the content of the data is irrelevant to your problem, stripping everything
else unrelated to the problem - menus, or buttons/listeners that perform other functions etc
2) explain the steps to require a refresh
3)explain what your attempt at refresh actually does and what it is
you're trying to achieve - be specific
('refresh' on its own means different things to different people)

[j2me64]

Ok. But is there a way to refresh the JIF?
Refreshing or reloading the JIF will be more appreciated than logically adjusting the lists of JComboBox.

if you really want to use internal frames then read this How to Use Internal Frames (The Java™ Tutorials > Creating a GUI With JFC/Swing > Using Swing Components)

here is a small excerpt from the above link

You should consider carefully whether to base your program's GUI around frames or internal frames. Switching from internal frames to frames or vice versa is not necessarily a simple task. By experimenting with both frames and internal frames, you can get an idea of the tradeoffs involved in choosing one over the other.

[chyrl]

I agree with your consideration regarding Internal Frame.
Actually, I do get confused programming the IF of my application. Yet it do have it's advantages when the application is runned.

But I'm still having a hard time getting those IF refreshed after each CUD function is selected. For example if I have a refresh button in the IF together with several useful display components of a specific record, the IF would reload itself. In these manner, I could easily make the next IF dependent on it updated also.

[chyrl]

j2me64:

What I saw in your link was the fundamentals regarding JIF. But it help me in some other ways. Getting into the point. My question is, how could I be able to refresh the contents of my components(List of the JComboBox, DataModel of the JTable, Menu of the JMenuBar).

Thanks.

[Michael Dunn]

I see we've just wasted out time trying to help you (won't happen again).

Swing - How to reload JInternalFrame

was it really that hard to break-down your code, and to explain exactly what you mean?

[j2me64]

But it help me in some other ways. Getting into the point. My question is, how could I be able to refresh the contents of my components(List of the JComboBox, DataModel of the JTable, Menu of the JMenuBar).

what do you want to "refresh"? initially we were talking about a jcombobox and now you are talking about datamodel, jtable, menu and jmenubar. could you please be more precise?

[chyrl]

Actually to be general.
Is there a way we could update all the components in just one call.
I was asking if there's a way the JIF could be refreshed and not the component only?

[j2me64]

I was asking if there's a way the JIF could be refreshed and not the component only?

i would say: no. because a jif can contain different component and each component must be refreshed in different ways. for your jtable read this How to Use Tables (The Java™ Tutorials > Creating a GUI With JFC/Swing > Using Swing Components) and then you will understand why.

[chyrl]

i would say: no. because a jif can contain different component and each component must be refreshed in different ways. for your jtable read this How to Use Tables (The Java™ Tutorials > Creating a GUI With JFC/Swing > Using Swing Components) and then you will understand why.

Even though placing all components in a JPanel? You still need to refresh all the components?

[DarrylBurke]

Another cross post:
How to reload JInternalFrame - Java Programming Forums

db

[chyrl]

Problem is resolved thanks to repaint()
Thanks to copeg of javaprogrammingforums
I have resolve this problem.

[Fubarable]

I'm glad that you have it solved, but next time, if you are going to cross-post, please post links to all of your cross-posts. Thank you for your cooperation.

[camickr]

I doubt using "repaint()" is the solution.

It means your design is very strange, but based on the information given we can't provide a proper solution.

[chyrl]

But I was wondering. What was the proper solution to this thread?
What method am I suppose to use to the JComboBox for it to update or refresh its list?

repaint(), revalidate(), updateUI() or ...?

[camickr]

You've been told (multiple times) we can't answer the question because we have no idea what you mean by "refresh" and you haven't posted your SSCCE showing what you are attempting to do.