Add items in jlist

hi
im a bit confused as to how to add items to a jlist during runtime
could someone please show an example

Hi,
Maybe this will help:
http://www.exampledepot.com/egs/javax.swing/list_ListAddRem.html?l=rel

Similar Messages

Cant delete or add item to Jlist as nthing happens

Hi all,
regarding the first part where pass of string array into object array. I have done it (thanks again for the help). But regarding the add and remove elements from the Jlist cant be done.. below is my code for the delete button when press. I cast it into int for the ManualList.getSelectedIndex();(at part A) but cant display and keep having a error call
java.lang.NullPointerException at ManualChange&ValueReporter.valueChanged
code for value reporter is at part B
Part A
private void deleteMouseClicked(MouseEvent e)
int n =(int)ManualList.getSelectedIndex();
if (!(n < 0) || (n > listModel.size()))
listModel.remove(n);
delete.setEnabled(false);
ManualList.repaint();
ManualList.revalidate();
Part B
private class ValueReporter implements ListSelectionListener {
public void valueChanged(ListSelectionEvent event) {
// if (!event.getValueIsAdjusting())
// gettext.setText(ManualList.getSelectedValue().toString());
ManualList.repaint();
ManualList.revalidate();
Any help is greatly appreciated.
alright, i redo part A the code is shown below but i still cant get the display out.
Is there some problem in my code? or is the repaint and revalidate thing wrong usage here ? Need help regarding this. Thanks
int n =ManualList.getSelectedIndex();
if (!(n < 0) || (n > listModel.size()))
listModel.removeElement(arrayObject[n]);
delete.setEnabled(false);
ManualList.repaint();
ManualList.revalidate();

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import java.awt.event.MouseEvent.*;
import javax.swing.event.*;
import java.io.*;
import javax.swing.DefaultListModel.*;
import java.util.Properties;
import java.util.ArrayList;
    public class smallProgram extends JFrame //implements ListSelectionListener
        JPanel p;
    private DefaultListModel listModel;
     JLabel ManualJob = new JLabel();
     JTextField gettext = new JTextField();
     JScrollPane scrollPane1 = new JScrollPane();
     JButton okButton = new JButton();
     JButton cancelButton = new JButton();
     JButton add = new JButton();
     JButton delete = new JButton();
     JList ManualList;
     int tokenNo;
     String real,ss;
     String[] values;
     Object[] arrayObject;
     java.util.StringTokenizer tokenizer;
     BufferedReader in;
     ArrayList data;
     public static void main(String args[])
         new smallProgram();
      public smallProgram()
            setTitle("Small Program");
            p = (JPanel) this.getContentPane();
            p.setLayout(null);
            setSize(515, 585);
            setVisible(true);
           //---- ManualJob ----
           ManualJob.setText("Manual Jobs Classification");
           ManualJob.setFont(new Font("Times New Roman", Font.BOLD, 14));
           p.add(ManualJob);
           ManualJob.setBounds(10, 435, 190, 35);
           setVisible(true);
           //---- gettext ----
           gettext.setFont(new Font("Times New Roman", Font.PLAIN, 12));
           p.add(gettext);
           gettext.setBounds(365, 435, 115, 25);
           setVisible(true);
           //Buttons for add, del, ok and cancel
           //---- Add ----
           add.setText("Add");
           add.addMouseListener(new MouseAdapter() {
               @Override
               public void mouseClicked(MouseEvent e) {
                   addMouseClicked(e);
           p.add(add);
           add.setBounds(355, 485, 60, add.getPreferredSize().height);
          //---- delete ----
           delete.setText("Delete");
           delete.addMouseListener(new MouseAdapter() {
               @Override
               public void mouseClicked(MouseEvent e) {
                   deleteMouseClicked(e);
           p.add(delete);
           delete.setBounds(new Rectangle(new Point(430, 485), delete.getPreferredSize()));
           //---- okButton ----
           okButton.setText("OK");
           okButton.addMouseListener(new MouseAdapter() {
               @Override
               public void mouseClicked(MouseEvent e) {
                   okButtonMouseClicked(e);
           p.add(okButton);
           okButton.setBounds(335, 520, 75, okButton.getPreferredSize().height);
           //---- cancelButton ----
           cancelButton.setText("Cancel");
           cancelButton.addMouseListener(new MouseAdapter() {
               @Override
               public void mouseClicked(MouseEvent e) {
                   cancelButtonMouseClicked(e);
           p.add(cancelButton);
           cancelButton.setBounds(420, 520, 75, cancelButton.getPreferredSize().height);
           ss = ("test1,test2,test3,test4,test5"); //My string ss
           int length = ss.length();
           int asd = (ss.indexOf('_'))+1;
           real = ss.substring(asd, length);
           tokenizer = new java.util.StringTokenizer(real,",");
           tokenNo = tokenizer.countTokens();
           data = new ArrayList();
           values = new String [tokenNo];
//           Object[] arrayObject = data.toArray();// this is my initial code where arraylist is pass to object
               for(int i =0; i< tokenNo; i++)   // pass string-ss into arraylist individually
                data.add((tokenizer.nextToken(",")));
                //values[i] = tokenizer.nextToken(",");
                data.trimToSize();
                //System.out.println("tokenizer" + values);
int aaaa = data.size();
System.out.println("size " + aaaa);
System.out.println("tokenizer" + tokenNo);
System.out.println("arraylist "+ i + data.get(i));
//JLIST
//======== scrollPane1 ========
//---- ManualList ---- This is my Jlist // copy arraylist into Object[] then pass it into JList
listModel = new DefaultListModel();
/* listModel = new DefaultListModel(); Part A also continue from above
* for (int i = 0; i< arrayObject.length;i ++)
* listModel.addElement(objectArray[i].toString());
* JList ManualList = new JList(listModel); //tried using listModel.method() to remove item in Jlist but return nullException
arrayObject = data.toArray();
JList ManualList=new JList(arrayObject);
ManualList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
ManualList.setSelectedIndex(0);
ManualList.setVisibleRowCount(5);
ManualList.setFont(new Font("Times New Roman", Font.PLAIN,12));
ManualList.setBorder(new MatteBorder(1, 1, 1, 1,Color.black));
ManualList.setLayoutOrientation(JList.VERTICAL_WRAP);
values = new String[tokenNo];
ManualList.addListSelectionListener(new ValueReporter());
// JScrollPane listPanel = new JScrollPane(ManualList);
scrollPane1.setViewportView(ManualList);
p.add(scrollPane1);
scrollPane1.setBounds(210, 435, 130, 75);
setVisible(true);
{ // compute preferred size
Dimension preferredSize = new Dimension();
for(int i = 0; i < p.getComponentCount(); i++) {
Rectangle bounds = p.getComponent(i).getBounds();
preferredSize.width = Math.max(bounds.x + bounds.width,preferredSize.width);
preferredSize.height = Math.max(bounds.y +bounds.height, preferredSize.height);
Insets insets = p.getInsets();
preferredSize.width += insets.right;
preferredSize.height += insets.bottom;
p.setMinimumSize(preferredSize);
p.setPreferredSize(preferredSize);
private void addMouseClicked(MouseEvent e)
private void deleteMouseClicked(MouseEvent e) //nthing happen here
int n =ManualList.getSelectedIndex();
if (!(n < 0) || (n > listModel.size()))
listModel.removeElement(arrayObject[n]);
delete.setEnabled(false);
ManualList.repaint();
ManualList.revalidate();
/* int n =ManualList.getSelectedIndex(); //tried using this but failed
if (!(n < 0) || (n > listModel.size()))
listModel.remove(n);
delete.setEnabled(false);
ManualList.repaint();
ManualList.revalidate();
private void okButtonMouseClicked(MouseEvent e) {
private void cancelButtonMouseClicked(MouseEvent e) {
private class ValueReporter implements ListSelectionListener {
public void valueChanged(ListSelectionEvent event) {
// if (!event.getValueIsAdjusting())
// gettext.setText(ManualList.getSelectedValue().toString());
//String name=(String) ManualList.getSelectedValue();
//System.out.println(name);
private void ManualListMouseClicked(MouseEvent e) {
// int n = (int)ManualList.getSelectedIndex();
// if (!(n < 0) || (n > listModel.size()))
// delete.setEnabled(true);
ok this is a small complete program
Thanks for the time to read this

Add item in JList

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I have not used a JList before, but looking at the API, one of the JLists constructors will take a Vector as one of it's argument
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list_ListTopic = new JList(new DefaultListModel());
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Hi
I have on list having items related to multiple locations.
Every location is related to one user.
When user logs in it filters the list with that users location.
Now when user click on add new item I want to get the data related to his location using item event listener.
But in new item form there is no way to get the location of that user in event listener as its new item.
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You need to modify the onclick event need to as below:
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Here is a similar thread for your reference:
http://social.technet.microsoft.com/Forums/en-US/b506cfe5-650e-4017-b470-9ca0a75cd390/sharepoint-2010-list-how-to-pass-parameters-in-a-url-to-another-page?forum=sharepointcustomizationprevious
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For more information, you can refer to:
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Linda Li
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Ahh answered my own question:
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Adnan Amin MCT, SharePoint Architect | If you find this post useful kindly please mark it as an answer.

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Hi All,
Thanks for all your reply, but maybe i didn't describe my problem clear. My problem for the combobox is that once the combobox has a selected value, then there is no way to clear it in the UI even I remove all the items in its ValidValues. From the user interface, the selected value still stays there but actually this combobox is empty and does not have any items. My question is how can I remove the current selected item in the combobox.
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SAME WAY REMOVE ITEMS FROM DROPDOWN BOX
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Hi Praveen,
Your form is not shared so I have not been able to access it. But I have updated mine. There are now two approaches, one that follows on from the above method and updates each drop down list in each row. The second updates a separate dataset that the drop down list is bound to. This second approach requires the remerge() method which can cause problems if your code has updates some form properties like a borders color as these will be reset, but the code is simplier and you will only have one list to maintain. The add button click code is;
var particulars = xfa.datasets.resolveNode("particulars");
if (particulars === null)
    particulars = xfa.datasets.createNode("dataGroup","particulars");
    xfa.datasets.nodes.append(particulars);
var particular = xfa.datasets.createNode("dataValue","particular");
particular.value = ItemName.rawValue;
var boundValue = xfa.datasets.createNode("dataValue","id");
boundValue.value = BoundValue.rawValue;
particular.nodes.append(boundValue);
boundValue.contains = "metaData";
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for (var i = 0; i < particulars.nodes.length; i++)
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if (particular.parent === null)
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// clear source fields
ItemName.rawValue = null;
BoundValue.rawValue = null;
// remerge form data to pick up new item
xfa.form.remerge();
And the binding looks like;
I have updated my sample to include both methods, https://workspaces.acrobat.com/?d=OwysfJa-Q3HhPtFlgRb62g
Regards
Bruce

Add items in jlist

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