JComboBox Mystery
I have a main JCombobox in a JFrame that starts up with a set of values. When a user selects an item from the main JComboBox (i.e actionListener, actionPerformed(ActionEvent ae), two other JComboBoxes are filled up with values. Note that the two JComboBoxes did not have any values initially. I am using the removeAllItems() method before I populate the two JComboBoxes.
My problem is that the values get added to the JComboBoxes more than once, if I use jcbox.addItem(<value>). Instead I tried jcbox.insertItemAt(<value>) and the earlier problem is solved.
Now the new problem is that I do not know if the values have been added to the JComboBoxes until I click on the arrow to pull down the list of the JComboBoxes. Generally the first value in the list is shown at the top always as default.
The other problem is that on selection on any item in any of the two JComboBoxes, it does not appear on the top of the list and doesn't even appear to be selected at all.
Some one please advice what could be done. I need to work on this ASAP.
All the info I can get would be helpful. Thanks
Dear Thomas,
what do you mean, you don't know if the values have been added? didn't your code add them?If you had read thourgh the message properly you wouldn't need to ask this question.
can you send some code snippet how you setup your 2 jcb'sI have worked out the problem. Right now I have implemented ItemListenerinterface. I have called the itemStateChanged(ItemEvent ie) method. Inside which I have a code that handles my problem real well.
It is:
if (ie.getSource() == jcbox && ie.getSelectedItem() == ItemEvent.SELECTED){ }
Thanks Thomas anyway. UI have added this code so that other's may refer to it.
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Thank youYou already have a posting on this topic:
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My problems have been highlighted in the comments of code above.
Any help will be much appreciated thanks!!!It is the completely correct code
I hope that's what you need
Just put DrawingBoard into JFrame and run
Good luck!
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I wonder if anyone can help me with an issue I'm having with a mystery application trying to open.
Every time I wake my iBook G4 from sleep, or I start it from shutdown (I am the only user), I see an application is trying to open at the right side of the dock. It shows as the generic application "A" starting to open, but then it suddenly vanishes. On the advice of a Mac-user friend, I went to System Preferences/Accounts/Login Items and removed everything there, then rebooted my machine, but I still have the same problem.
From my unfortunate experiences with PCs, I remember this type of login behavior usually indicates the machine is infected with a virus. Is that what is causing my iBook problem? I have the Firewall turned on, and I'm running Norton Antivirus for Mac (which has found nothing in repeated scans). What should I try next? Any help with this would be really appreciated.
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iBook G4 Mac OS X (10.4.6)It's difficult to say what the application may be if you can't see its name, but in the Dock, the name won't show unless you are pointing at the icon. If you can get your mouse there fast enough (maybe put it in the right place, sleep, then wake your Mac?) you might see the app name before it closes. Then you'll have a better idea what it is.
You might also try the Activity Monitor application, which is in the /Applications/Utilities folder. It shows all the running processes, so you might be able to catch the app name before it closes.
When you know what the application is called, you may decide it's not a problem at all. If it's still unclear, come back and post it, and maybe someone will be able to tell you what it is. Lots of applications use little "helper apps," and it's possible it could be something like that. It's best to know what it is, but it's probably harmless.
G4 400 AGP Mac OS X (10.4.2) -
Problem with JComboBox in a JPanel
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String[] stateList={"AL",.....};
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Hi,
I've created a JComboBox in a JToolBar that contains all available fonts. When I click on the drop down arrow I only see the first font and a small part of the second. The JComboBox is dropped down in fact just as far as the border of the JToolbar. All the rest isn't visible to me; it seems that they are behind the other components of my JApplet. However, if I move the JToolBar from it's position (as it's a floatable component), there's no problem at all. So I'm wondering why I can't see everything when the JToolBar is docked.... Can anyone help me?
Thanks in advance!!
E_Jit seems that they are behind the other components of my JApplet.Sounds like you are mixing AWT components with your Swing application. Make sure you are using JPanel, JButton ... and not Panel, Button....
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