Dynamically change JComboBox

Question

I am fetching the data values from the database successfully. I have also stored them into a String[] array. I need to load the String array as the items of the JComboBox in response to key actionperformed. How can I reload the items of the JComboBox whenever a key is pressed as the fetched values depend on the key pressed. Rather simply, I need to dynamically refresh the JComboBox items.

Answer 1

DefaultComboBoxModel model = new DefaultComboBoxModel( yourStringArray );
comboBox.setModel( model );

Answer 2

You have a couple of options. You can use removeAllItems() (or one of the other remove methods) and addItem(Object anObject) to manipulate the selectable objects. Or you could implement a ComboBoxModeland allow it to serve up data from your array.

Answer 3

This is the demo for illustrating default combo box model

public class ComboPanel extends JPanel {

    JComboBox jcbo;
    // this is constructor
    public ComboPanel(ArrayList<String> items) {
        jcbo = new JComboBox();
        // getting exiting combo box model
        DefaultComboBoxModel model = (DefaultComboBoxModel) jcbo.getModel();
        // removing old data
        model.removeAllElements();

        for (String item : items) {
            model.addElement(item);
        }

        // setting model with new data
        jcbo.setModel(model);
        // adding combobox to panel
        this.add(jcbo);    
    }
}

I hope this will help little :)

Answer 4

It also works without DefaultComboBoxModel...

JComboBox op=new JComboBox(new String[] {"d","e","f"});
op.removeAllItems();
String[] new_entries=new String[] {"a","b","c"}
for (String s : new_entries) {
     op.insertItemAt(s, op.getItemCount());
}
op.setSelectedIndex(0);

Guess which values you'll see...