---

Hi all, I stucked by following recently:

----------------------------------------------------------------------------
------------------
I use JComboBox to display retrieved data (in form of Vector) in database,

databaseVector = database.getVector();
JComboBox jcbInstance = new JComboBox(dataBaseVector);

but after database content changed, I do:

databaseVector = newVectorValue;
jcbInstance.revalidate();
jcbInstance.repaint();

----------------------------------------------------------------------------
---------------
Then I find that the ComboBox just display something old, not refreshing
stuff.

Could anyone help me with this? Thank you and welcome any suggestion.

Chan

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> I use JComboBox to display retrieved data (in form of Vector) in database,
>
> databaseVector = database.getVector();
> JComboBox jcbInstance = new JComboBox(dataBaseVector);
>
> but after database content changed, I do:
>
> databaseVector = newVectorValue;
> jcbInstance.revalidate();
> jcbInstance.repaint();
>
> --------------------------------------------------------------------------
--
> ---------------
> Then I find that the ComboBox just display something old, not refreshing
> stuff.
>
> Could anyone help me with this? Thank you and welcome any suggestion.

Hi Chan,

This works for me. It's probaly not the best solution... but it works

jcbInstance.removeAllItems();
for (int i = 0; i < databaseVector .size(); i++)
jcbInstance.addItem(databaseVector .get(i));

---

Yeah! Carsten. You are right, I am too stubborn, to a point that attempt in
implementing ListDataListener, thinking contentschanged method may helps...I
used yours suggestion now....Very much thanks......

But by the way, I haven't use revalidate and repaint, it works already, is
it OK? not to do repaint/revalidate.

^_- Thanks
Chan

"Carsten Højgaard" <nospam_carsten@hojgard.dk> ¼¶¼g©ó¶l¥ó·s»D
:3d9601b3$0$18147$edfadb0f@dspool01.news.tele.dk...
> > I use JComboBox to display retrieved data (in form of Vector) in
database,
> >
> > databaseVector = database.getVector();
> > JComboBox jcbInstance = new JComboBox(dataBaseVector);
> >
> > but after database content changed, I do:
> >
> > databaseVector = newVectorValue;
> > jcbInstance.revalidate();
> > jcbInstance.repaint();
> >
>
> --------------------------------------------------------------------------
> --
> > ---------------
> > Then I find that the ComboBox just display something old, not refreshing
> > stuff.
> >
> > Could anyone help me with this? Thank you and welcome any suggestion.
>
> Hi Chan,
>
> This works for me. It's probaly not the best solution... but it works
>
> jcbInstance.removeAllItems();
> for (int i = 0; i < databaseVector .size(); i++)
> jcbInstance.addItem(databaseVector .get(i));
>
>
>

---

"Roma Chan" <romachan@netvigator.com> skrev i en meddelelse
news:an4ufr$k2m2@imsp212.netvigator.com...
> Hi all, I stucked by following recently:
>
> --------------------------------------------------------------------------
--
> ------------------
> I use JComboBox to display retrieved data (in form of Vector) in database,
>
> databaseVector = database.getVector();

Here you have an attribute which value is a reference to a Vector (VectorA).

> JComboBox jcbInstance = new JComboBox(dataBaseVector);

Now some internal attribute of jcbInstance has a value that is a reference
to VectorA. That is, the internal value is a copy of the value held by
databaseVector.

>
> but after database content changed, I do:
>
> databaseVector = newVectorValue;

Now you have updated the value of the databaseVector attribute, but you
haven't updated the value of the internal reference in jcbInstance.

> jcbInstance.revalidate();
> jcbInstance.repaint();
>
> --------------------------------------------------------------------------
--
> ---------------
> Then I find that the ComboBox just display something old, not refreshing
> stuff.

That is because you haven´t updated the internal reference in jcbInstance.

> Could anyone help me with this? Thank you and welcome any suggestion.

I don't know much about JComboBox, so I don't know what options that API
gives you, but you basically have two options:

1) You can change the contents of the Vector reference (that is, call
methods on the object, not change the reference), and hope that this change
will cause the JComboBox to change its display. But that will mean that you
rely on some internal mechanism of JComboBox that you basically have no
control over. Eg. if JComboBox takes a copy of all the elements in the
Vector and store them in some internal format, you may have no way of
changing (and no reason to change) this internal format.

2) You can give the new Vector to jcbInstance (if that is possible) and ask
the jcbInstance to repaint it self based on this new Vector. I would prefere
this method, because that doesn't rely on some internal mechanism of
JComboBox.

Hope this helps.

/Anders