二级联动JAVA代码 java实现二级联动

java二级联动

你这个不能这样写

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你只能用ajax来做只要其他条件变动就触发请求访问后台然后后台根据条件查询相应的出票方，以json格式传到前台，然后解析用js放入相应的select标签

至于ajax二级联动你自己百度下一大把原理都是ajax请求 js解析放入相应的标签

LigerUI的java版二级联动例子

你可以通过 jquery 的ajax 访问后台获取 json数据。这样就可以直接把传过来的接送数据赋值给proData

还可以通过纯jsp的方法

JSONObject json = JSONObject.fromObject(你访问你后台的方法返回的字符串数据);

在js里面

var proData = eval("(%=json %)")

java二级联动，怎样在选了前面一个之后，后面的也跟着动

java中要实现二级联动，应该使用ajax技术，实例如下：

var req;

function chooseEmp()

{

var emp= document.getElementById('empId');

var url = "MagEmp?emp="+escape(emp.value);

if (window.XMLHttpRequest) {

req = new XMLHttpRequest();

}else if (window.ActiveXObject) {

req = new ActiveXObject("Microsoft.XMLHTTP");

}

if(req){

req.open("GET", url, true);

req.onreadystatechange = callback;

req.send(null);

}

function callback()

{

if(req.readyState == 4)

{

if(req.status == 200)

{

parseMessage();

}else{

alert("Not able to retrieve description"+req.statusText);

}

function parseMessage()

{

var xmlDoc=req.responseXML.documentElement;

var xSel=xmlDoc.getElementsByTagName('select');

var select_root=document.getElementById('magId');

select_root.options.length=0;

for(var i=0;ixSel.length;i++)

{

var xValue=xSel[i].childNodes[0].firstChild.nodeValue;

var xText=xSel[i].childNodes[1].firstChild.nodeValue;

var option=new Option(xText,xValue);

try{

select_root.add(option);

}catch(e){

}

java swing下拉框两级联动

//: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[][] xxx = {

{"浙江","杭州","温州","绍兴","舟山",},

{"江苏","南京","无锡","徐州","蒙眬",},

{"上海","闵行区","普陀区","金山区",},

};

private Object[] a(){

Object[] os = new Object[xxx.length];

for(int i=0; ixxx.length; i++){

os[i]=xxx[i][0];

}

return os;

}

private Object[] b(Object a){

for(int i=0; ixxx.length; i++){

if(xxx[i][0].equals(a)){

Object[] o = new Object[xxx[i].length-1];

for(int j=0; jo.length; j++)

o[j]=xxx[i][j+1];

return o;

}

return new Object[]{};

}

public static void main(String[] args) {

final ComboBoxText ct = new ComboBoxText();

final JComboBox ca = new JComboBox(ct.a());

final JComboBox cb = new JComboBox();

ca.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e) {

cb.removeAllItems();

Object selected = ca.getSelectedItem();

Object[] newItems = ct.b(selected);

for(int i=0; inewItems.length; i++)

cb.addItem(newItems[i]);

}

});

ca.setSelectedIndex(-1);

JFrame f = new JFrame();f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f.getContentPane().setLayout(new FlowLayout(FlowLayout.LEFT));

f.add(ca);f.add(cb);f.setVisible(true);

f.setSize(200,100);

}

jsp 二级联动

%@ page language="java" contentType="text/html; charset=gb2312"

pageEncoding="gb2312"%

html

head

title/title

meta http-equiv="Content-Type" content="text/html; charset=gb2312"

style

body,select

{

font-size:9pt;

font-family:Verdana;

}

{

color:red;

text-decoration:none;

}

a:hover{

text-decoration:underline;

}

/style

SCRIPT LANGUAGE="JavaScript"

!--

function Dsy()

{

this.Items = {};

}

Dsy.prototype.add = function(id,iArray)

{

this.Items[id] = iArray;

}

Dsy.prototype.Exists = function(id)

{

if(typeof(this.Items[id]) == "undefined") return false;

return true;

}

function change(v){

var str="0";

for(i=0;iv;i++){ str+=("_"+(document.getElementById(s[i]).selectedIndex-1));};

var ss=document.getElementById(s[v]);

with(ss){

length = 0;

options[0]=new Option(opt0[v],opt0[v]);

if(v document.getElementById(s[v-1]).selectedIndex0 || !v)

{

if(dsy.Exists(str)){

ar = dsy.Items[str];

for(i=0;iar.length;i++)options[length]=new Option(ar[i],ar[i]);

if(v)options[1].selected = true;

}

if(++vs.length){change(v);}

}

var dsy = new Dsy();

dsy.add("0",["1","2","3","4"]);

dsy.add("0_0",["11","12","13"]);

dsy.add("0_1",["21","22","23"]);

dsy.add("0_2",["31","32","33"]);

dsy.add("0_3",["41","42","43"]);

//--

/SCRIPT

SCRIPT LANGUAGE = JavaScript

var s=["s1","s2"];

var opt0 = ["请选择","请选择"];

function setup()

{

for(i=0;is.length-1;i++)

document.getElementById(s[i]).onchange=new Function("change("+(i+1)+")");

change(0);

}

//--

/SCRIPT

/head

body bgcolor="#E0E0E0" onload="setup()"

form name="frm" action="11.jsp"

select id="s1" name="s1"option/option/select

select id="s2" name="s2"option/option/select

input type="submit" name="Submit" value="提交"

/form

/body

/html

11.jsp

html

head

meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"

titleInsert title here/title

/head

body

String s1 = request.getParameter("s1");

String s2 = request.getParameter("s2");

out.println(s1);

out.println(s2);