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

问题

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.

回答1:

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.

回答2:

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());

回答3:

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);
      }
    }

来源：https://stackoverflow.com/questions/14307582/how-to-insert-items-to-a-jcombobox-at-runtime-and-save-it

标签

java

swing

actionlistener

jcombobox

comboboxmodel