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Using Swing's JComboBox...

Posted on 1998-04-06
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Last Modified: 2008-03-06
I am having trouble with the JComboBox from Swing.  I have a combo box on one of my panels.  I have added a few items to the combo box.  When I run the app, and try to select an item from the combo box, the popup list of items does not appear.  Why is this, and how can I fix it?
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Question by:stepma
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3 Comments
 
LVL 5

Expert Comment

by:fontaine
ID: 1233945
Maybe are you using both AWT and Swing components. This is not recommended. If you are adding the JComboBox to a Panel, try using a JPanel instead. If this is not the problem, it is difficult to make a diagnosis without taking a look at the code...
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Author Comment

by:stepma
ID: 1233946
I am using a JPanel...Here is the code:

val_sph = new JComboBox(items);
            val_sph.setSelectedIndex(0);
            val_sph.setLightWeightPopupEnabled(false);
            val_sph.setEditable(false);
            add(val_sph);

I have gotten it to work by adding setLightWeightPopupEnabled(false);
Why is this?
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Accepted Solution

by:
mnelson051997 earned 100 total points
ID: 1233947
Is your JComboBox at the bottom of the panel?  If so, making the
popup heavy will allow it to display outside the panel.  This would
explain why it shows up when you use setLightWeightPopupEnabled(false).
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