I want to select a particular item in list box. for this i have following
jList2.setSelectedIndex(index);//index of particular element
jList2.ensureIndexIsVisible(index);
But above code is not selecting the element nor scrolling and showing in screen. Element appears in list box but not get selected. Am i doing anythng wrong here?
Sorry for delayed reply. My internet connection was down so couldnt reply. Here is my code. I still have same problem. Unable to select element in listbox.
public class MyFrame extends javax.swing.JFrame implements ActionListener{
private javax.swing.JList jList1;
private javax.swing.JList jList2;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JButton saveButton;
private javax.swing.DefaultListModel matchAclModel, dontmatchAclModel;
private java.util.Vector dataElements = null;
public MyFrame() {
jScrollPane1 = new javax.swing.JScrollPane();
matchAclModel = new javax.swing.DefaultListModel();
jList1 = new javax.swing.JList(matchAclModel);
jScrollPane2 = new javax.swing.JScrollPane();
dontmatchAclModel = new javax.swing.DefaultListModel();
jList2 = new javax.swing.JList(dontmatchAclModel);
saveButton = new javax.swing.JButton();
jScrollPane1.setViewportView(jList1);
jScrollPane2.setViewportView(jList2);
saveButton.setText("Save");
//here code for adding them to frame
//....................
pack();
saveButton.addActionListener(this);
fillVector();
//following code fills the listbox by reading data from vector
for(int index=0; index<dataElements.size();index++) {
matchAclModel.addElement(dataElements.elementAt(index));
dontmatchAclModel.addElement(dataElements.elementAt(index));
}
}
public void fillVector() {
//code that reads a file and fills the vector
}
//in following method msgtext is instance variable that contains either always or never string
public void displaySelected(String data, int index) {
String array[] = data.split("\\s");
if(array == null) {}//todo: display error}
if(array[1] == null) {}//todo: display error or do nothing
System.out.println(msgtext + ":" + array[2].substring(1,array[2].length()));
if(msgtext.equalsIgnoreCase("always")) {
jList1.setSelectedIndex(index);
jList1.ensureIndexIsVisible(index);
}else if(msgtext.equalsIgnoreCase("never")) {
if(array[2].startsWith("!")) {
array[2] = array[2].substring(1, array[2].length());
}
jList2.setSelectedIndex(index);
jList2.ensureIndexIsVisible(index);
}
}
public void actionPerformed(ActionEvent evt) {
if(evt.getSource() == saveButton) {
displaySelected("always",5);
}
}
>
> "post a sample program that displays the problem."
>
> a program is something we can copy/paste/compile/run
> and see the behaviour,
> without having to do anything else.
>
Whatever i posted in previous reply is my actual code. The missing code is gui design code which is auto generated by netbeans. My actual requirement is to fill the list box and read a file and a text and select this text read from file , matching element in listbox.
> anyway, a quick read
> if(msgtext.equalsIgnoreCase("always")) {
>
> what is msgtext?
msgtext is a string which contains either strings "always" or "never"