Dynamic textfield creation

[cha kio]

I woold like to ask how can i create dynamicly textfields, and how to handle the content of them after the creation???
i have a variable which says how many textfields i will have.

int counttextfields =10; // i need 10 textfields

for(int i=0; i<counttextfields; i++){

//what i have to put here??????

}

I have i JFrame,Jbutton and Jpanel created with the netbeans GUI (WITH THE PALLET ).

I need to press the Jbutton and to appear the 10 Jtexfields in the Jpanel, But sometimes maybe will be more than 10 it depends of the counttextfields variable.

I have try something like this but doesn't worked.

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
int counttextfields =10; // i need 10 textfields

for(int i=0; i<counttextfields; i++){
JtextFiels "jt"+counttextfiels = new JTextfield();
Jpanel.add(jt);
}
}

Thank you in advanced

ki_ha1984

[Maneesh Godbole]

Welcome to the Ranch

JtextFiels "jt"+counttextfiels = new JTextfield(); 

Does this even compile? Please PostRealCode (<=This is a link. Click to read)

Whenever you add/remove components from a container which is already being displayed, the best way to refresh the UI is to call a revalidate() and repaint() on the container.

[cha kio]

ok the first and main class is:

JavaAppDemos.java

package javaappdemos;

import java.util.ArrayList;
import java.util.List;
import javax.swing.JTextField;

public class JavaAppDemos {

    public static void main(String[] args) {
        
  NewJFrame jf = new NewJFrame();
  jf.setVisible(true);
 
    }
    public static void aaaaaaaaaaa (){
         int countme = 10;      
        List<JTextField> fields= new ArrayList<JTextField>(); 
 
            for (int i= 0; i < countme; i++){ // create the text fields ...
                fields.add(new JTextField());

            }
     }
}

The secind class is NewJFrame.java (Created by the NETBENAS GUI)

package javaappdemos;

public class NewJFrame extends javax.swing.JFrame {

    public NewJFrame() {
        initComponents();
    }

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        jPanel1 = new javax.swing.JPanel();
        jButton1 = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 100, Short.MAX_VALUE)
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 100, Short.MAX_VALUE)
        );

        jButton1.setText("jButton1");
        jButton1.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jButton1MouseClicked(evt);
            }
        });
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap(172, Short.MAX_VALUE)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(jButton1)
                        .addGap(85, 85, 85))
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(128, 128, 128))))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addGap(29, 29, 29)
                .addComponent(jButton1)
                .addGap(65, 65, 65)
                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(83, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>

    private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {                                      

        JavaAppDemos.aaaaaaaaaaa();
    }                                     

 

    public static void main(String args[]) {

        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
     
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>


        java.awt.EventQueue.invokeLater(new Runnable() {

            public void run() {
                new NewJFrame().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify
    private javax.swing.JButton jButton1;
    public static javax.swing.JPanel jPanel1;
    // End of variables declaration
}

Sorry for the log code but it is created from the netbeans.

[cha kio]

The problem is thay o want to prees the jbutton and auto add the textfields in the JPanell

Iam PHP programmer and it is very difficult to me to umake something like this.

[Darryl Burke]

If you're new to Java, why are you using the NetBeans visual designer? That's an advanced tool.

Learn Swing coding from the tutorial.

[cha kio]

i read that Netbeans is very good tool.
I know about this tutorial.
Bu t the problem is that i didnt found something about that i need.
Dynamic variable names and dynamic textfield creation and handling.
I s there any example about those???

[Darryl Burke]

cha kio wrote:i read that Netbeans is very good tool.

If you're referring to the NetBeans visual designer, sure it's a good tool. And like any good tool, it has a fairly steep learning curve.

Learning to use the visual designer effectively is greatly facilitated once you already know how to hand-code a GUI. Trying to learn both Swing coding and the quirks of a visual designer simultaneously, now that I wouldn't recommend.

cha kio wrote:I know about this tutorial.
Bu t the problem is that i didnt found something about that i need.
Dynamic variable names and dynamic textfield creation and handling.

Try going through some other sections of the Oracle tutorial. Like the ones that deal with arrays and collections. Those are more fundamental topics than Swing, so you need to learn them first.

cha kio wrote:I s there any example about those???

One question mark is enough.

[Darryl Burke]

cha kio, please BeForthrightWhenCrossPostingToOtherSites <-- link
http://www.java-forums.org/new-java/58087-dynamic-textfield-creation.html

[Paul Clapham]

Dynamic variable names? Not a Java feature. Looks to me like you might want to use an array, or something like that.

[cha kio]

can you give me an example of the array that you say?

[Paul Clapham]

Even better: here's a link to the part of the Oracle tutorial which covers arrays: Arrays. Java has plenty of good tutorials and they are easy to find on the web. If you're looking for a tutorial about concept X in the Java language then your Google keywords are "java X tutorial". If you see an Oracle tutorial in the list, you should read that one in preference to others which might appear.