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JAvA下拉框

//核心代码String[] sg= {"苹果","香蕉","樱桃","山楂"};JComboBox jcb = new JComboBox(sg);完整代码 import java.awt.*;import javax.swing.*;public class MFrame extends JFrame{public MFrame() {String[] sg= {"苹果","香蕉","樱桃","山楂...

final JComboBox dbtype = new JComboBox(); dbtype.addItem("南京"); dbtype.addItem("苏州"); dbtype.addItem("南通"); dbtype.setSelectedItem("南京");//默认选中南京 dbtype.addItemListener(new ItemListener(){ public void itemStateCha...

选中事件: JComboBox comboBox_4 = new JComboBox(); comboBox_4.setBounds(199, 117, 35, 22); panel_2.add(comboBox_4); //这是父容器 comboBox_4.addItem("1");//添加元素 comboBox_4.addItem("2"); comboBox_4.addItem("3"); //监听选中 co...

你好,在cp.add(jc);后面,加上以下代码即可 jc.addItemListener(new ItemListener(){ @Override public void itemStateChanged(ItemEvent e) { System.out.println(jc.getSelectedItem().toString()); } });

//:ComboBoxText.java import java.awt.FlowLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JComboBox; import javax.swing.JFrame; public class ComboBoxText { private String[][] x...

JComboBox有一个getSelectedItem()的方法得到选择的值和一个getSelectedIndex()得到选择值的索引。getSelectedObjects()得到选择的多个值。getItemCount()是得到选择的数量。getItemAt(int i)是得到指定索引的值。 下面是一个具体的例子,首先输...

import java.awt.event.ItemListener; import java.awt.event.ItemEvent; import javax.swing.JFrame; import javax.swing.JComboBox; public class ComBoxDemo extends JFrame { JComboBox computer; //主类别下拉框 JComboBox fittings; //配...

import java.applet.Applet; import java.awt.*; import java.awt.event.*; public class L extends Applet implements ItemListener, ActionListener { Choice choice; TextField text; TextArea area; Button add, del; public void init() { ...

在js中通过var v=decument.getElementById("id名").value;获得值; 运用jQuery的话就是这个了$("#下拉框id").val() ; 在sevlet里就通过request.getParameter("控件名称");取值; 这个可以取text,password,radio,select的值;返回字符串 req...

使用谷歌浏览器,用开发人员工具看下,请求的表单参数是否已经包含了这个typee,如果不包含,后台自然不会获取到了。

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