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;

}

a

{

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);

%

/body

/html


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