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.

score 41 · Accepted Answer · edited Dec 01 '20 at 13:39

41

DefaultComboBoxModel<String> model = new DefaultComboBoxModel<>( yourStringArray );
comboBox.setModel( model );

edited Dec 01 '20 at 13:39

JCWasmx86

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answered Jan 06 '11 at 21:59

camickr

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Thanks for your Answer but can you please post a code to illustrarte this. it will be very helpfull. I am not sure of what to write in the DefaultComboBoxModel class. – Suman.hassan95 Jan 06 '11 at 22:06
That is the code. You don't write anything in the DefaultComboBoxModel class. You just create the model using your array of strings and then add the model to the combo box. – camickr Jan 06 '11 at 22:12

Mizuki · Answer 2 · 2016-03-31T11:32:03.693

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 :)

score 7 · Answer 3 · answered Jan 06 '11 at 21:59

7

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.

answered Jan 06 '11 at 21:59

unholysampler

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Dynamically change JComboBox

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