JComboBox Selection Change Listener

Question

I m trying to get an event to fire whenever a choice is made from a JComboBox   The problem I m having is that there is no obvious addSelectionListener   method   I ve tried to use actionPerformed    but it never fires   Short of overriding the model for the JComboBox  I m out of ideas   How do I get notified of a selection change on a JComboBox     Edit  I have to apologize  It turns out I was using a misbehaving subclass of JComboBox  but I ll leave the question up since your answer is good

User · Answer

you can do this with jdk  gt   8 getComboBox   addItemListener this  comboBoxitemStateChanged    so public void comboBoxitemStateChanged ItemEvent e        if  e getStateChange      ItemEvent SELECTED            YourObject selectedItem    YourObject  e getItem              TODO your actitons

User · Answer

Code example of ItemListener implementation  class ItemChangeListener implements ItemListener       Override     public void itemStateChanged ItemEvent event           if  event getStateChange      ItemEvent SELECTED              Object item   event getItem                 do something with object                           Now we will get only selected item   Then just add listener to your JComboBox  addItemListener new ItemChangeListener

User · Answer

You may try these   int selectedIndex   myComboBox getSelectedIndex      -or-  Object selectedObject   myComboBox getSelectedItem      -or-  String selectedValue   myComboBox getSelectedValue   toString

User · Answer

I was recently looking for this very same solution and managed to find a simple one without assigning specific variables for the last selected item and the new selected item  And this question  although very helpful  didn t provide the solution I needed  This solved my problem  I hope it solves yours and others  Thanks   How do I get the previous or last item

User · Answer

It should respond to ActionListeners  like this   combo addActionListener  new ActionListener          public void actionPerformed ActionEvent e            doSomething                 John Calsbeek rightly points out that addItemListener   will work  too   You may get 2 ItemEvents  though  one for the deselection of the previously selected item  and another for the selection of the new item  Just don t use both event types

User · Answer

Here is creating a ComboBox adding a listener for item selection change   JComboBox comboBox   new JComboBox     comboBox setBounds 84  45  150  20   contentPane add comboBox    JComboBox comboBox 1   new JComboBox    comboBox 1 setBounds 84  97  150  20   contentPane add comboBox 1   comboBox addItemListener new ItemListener         public void itemStateChanged ItemEvent arg0              Do Something

User · Answer

I would try the itemStateChanged   method of the ItemListener interface if jodonnell s solution fails

[java] JComboBox Selection Change Listener?

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