Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

Key Listener for a JComboBox

Posted on 2001-09-10
4
899 Views
Last Modified: 2012-06-27
All,

I have a editable JComboBox, which the end-user can select an item from a list or enter an item in manually.  The problem is that I need to do checks on the characters that the user enters and only allow specfic character to be entered.  Therefore I need to implement so sort of Key Listener to the JComboBox.
I have tried adding a KeyListener and KeyAdaptor to the JComboBox, but it doesn't seem to be capturing the key events.
Any suggestions???
I am using JBuilder3 and JDK 1.3.1 by the way.

Thanks in advance!
0
Comment
Question by:Cuong
  • 2
4 Comments
 
LVL 2

Expert Comment

by:mzimmer74
ID: 6472398
A JComboBox is actually a component made up of several other components, one of them being a JList.  I suspect that what you may need to do is add the KeyListener to the JList rather than the JComboBox.  You can get the JList by getting the component list from the JComboBox by calling box.getComponents() which returns Component[], and then searching through that array for a JList Component.  Hope that helps.
0
 
LVL 9

Accepted Solution

by:
Ovi earned 100 total points
ID: 6473272
The problem that you are having is that when your combobox become editable, you must retrieve the EDITOR associated to this operation and listen for key events inside of it. Usually the editor is represented by a simple JTextField.

something like :

myCombo.getEditor().addActionListener(new ActionListener() {
  public void actionPerformed(ActionEvent ae) {
    **************************
  }
});

or
myCombo.getEditor().getEditorComponent() and mess around with this one.
0
 

Author Comment

by:Cuong
ID: 6473784
Excellent! Thanks alot!
0
 

Author Comment

by:Cuong
ID: 6496626
Just what I want
Thanks alot!!
0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Application launch issue with Apache Tomcat 5 62
tomcat startup error 5 100
by zero exception 10 52
CSV file parsing thru Java 13 34
For customizing the look of your lightweight component and making it look lucid like it was made of glass. Or: how to make your component more Apple-ish ;) This tip assumes your component to be of rectangular shape and completely opaque. (COD…
Basic understanding on "OO- Object Orientation" is needed for designing a logical solution to solve a problem. Basic OOAD is a prerequisite for a coder to ensure that they follow the basic design of OO. This would help developers to understand the b…
Viewers will learn one way to get user input in Java. Introduce the Scanner object: Declare the variable that stores the user input: An example prompting the user for input: Methods you need to invoke in order to properly get  user input:
This theoretical tutorial explains exceptions, reasons for exceptions, different categories of exception and exception hierarchy.

792 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question