如何用下拉列表来改变一个文本框的值？

Question

如何用下拉列表来改变一个文本框的值？

Answer 1

<input type="text" name="txt">
<select name="sel" onchange="changeText(this);">
   <option value="">请选择...
   <option value="男">男
   <option value="女">女
</select>
<script>
   function changeText(obj){
      document.getElementsByName("txt")[0].value=obj.value;
   }
</script>

Answer 2

参考一下：
/*
 * File Name: JComBoxDemo.java Copyright: Huawei Technologies Co., Ltd.
 * Copyrighted. Description: Date Created: 2008-9-22 下午04:26:44 Modify History:
 * 1. Name: Kate Date: 4444-44-44 Form: BYLD444444 Content: ......
 */package demo;import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;import javax.swing.JComboBox;
import javax.swing.JDialog;
import javax.swing.JTextField;public class JComBoxDemo extends JDialog
{
    Container cp;    private JComboBox cb;    private JTextField ft;    public JComBoxDemo()
    {
        bulidCompent();
        showDialog();
        
    }    private void bulidCompent()
    {
        cp = getContentPane();
        cp.setLayout(new FlowLayout());
        cb = new JComboBox();
        cb.addItem(new String("北京"));
        cb.addItem(new String("深圳"));
        cp.add(cb);
        ft = new JTextField(10);
        cp.add(ft);
        cb.addItemListener(new ItemListener()
        {
            public void itemStateChanged(ItemEvent e)
            {
                ft.setText((String) cb.getSelectedItem());
            }
            
        });
        
    }    private void showDialog()
    {
        setTitle("JComBoxDemo");
        setBounds(100, 100, 250, 80);
        setVisible(true);
        setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
    }    /**
     * @param args
     */
    public static void main(String[] args)
    {
        new JComBoxDemo();    }}

Answer 3

给JComboBox添加ItemListener，
JComboBox.addItemListener(new ItemListener() 
        { 
            public void itemStateChanged(ItemEvent e) 
            { 
                JTextField.setText(JComboBox.getSelectedItem().toString()); 
            } 
            
        });