How to insert items to a jcombobox at runtime and save it

Question

I need to save the values in my jcombobox at the runtime. What I am trying to do is after clicking on a button, I am setting it to editable = true. Then type the value in the combobox, but it doesn't save.

private void btadbknameActionPerformed(java.awt.event.ActionEvent evt) {
  if(evt.getSource()== btadbkname){
    cb_bkname.setEditable(true);
    cb_bkname.getText();
    cb_bkname.addItem(evt);
  }else{
    cb_bkname.setEditable(false);
  }
}

I have already added some elements in it on the designing level, but it's limited if some random value comes then its a problem.

What do you mean by "it doesn't save"? Do you mean that you're not seeing the ActionEvent.toString() representation in the combobox? Or that you are seeing a new item in the JComboBox, but it doesn't persist if you close the program and then re-open it? — Hovercraft Full Of Eels, Jan 13 '13 at 20:08
no at the runtime if i enter some random value other than what i have set previously then that is not adding in the combobox list. i need to add some value to the combobox list when i click on the button. i dont have much knowledge of progrmaing what i know i have tried but it dosent work — Sumeet Gavhale, Jan 13 '13 at 20:12
I second the recommendation that you will want to review your previous questions and accept more of them -- we greatly appreciate that, but I'm not sure how we can help based on such limited information. Consider creating and posting a small compilable and runnable program (please no NetBeans-generated code) that demonstrates your problem, and I'll bet we can help better, an [SSCCE](http://sscce.org). Note that JComboBoxes don't even have a `getText()` method, so if cb_bkname is your JComboBox, I'm surprised if this code even compiles. — Hovercraft Full Of Eels, Jan 13 '13 at 20:15

score 3 · Accepted Answer · edited May 23 '17 at 12:04

Because it is possible to add / remove Item(s) to / from the DefaultComboBoxModel underlaying the JComboBox, the same action (by default) is possible from outside.
You have to use MutableComboBoxMode to add / remove Item(s) to / from JComboBox that fires event from itself (view_to_model).
There are excellent examples of MutableComboBoxModel by @Robin here and here.
For better help sooner post an SSCCE, for future readers, otherwise search for extends AbstractListModel implements MutableComboBoxModel.

score 1 · Answer 2 · answered Jan 13 '13 at 21:53

1

it can't possibly work the way you're trying it.

the comboBox has to be editable before you click the button then you just need this line

cb_bkname.addItem(((JTextField)cb_bkname.getEditor().getEditorComponent()).getText());

answered Jan 13 '13 at 21:53

Michael Dunn

818
5
3

score 1 · Answer 3 · answered Jan 13 '13 at 22:25

Try this

private void btadbknameActionPerformed(java.awt.event.ActionEvent evt) {
      if(evt.getSource()== btadbkname){
        cb_bkname.setEditable(true);
        String newItem=cb_bkname.getText();
        cb_bkname.addItem(newItem);
      }else{
        cb_bkname.setEditable(false);
      }
    }

How to insert items to a jcombobox at runtime and save it

3 Answers3

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