<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>js+ajax三级联动</title>
</head>
<body>
<!---------------------------------------------------------------->
<!--框架-->
<!---------------------------------------------------------------->
<select name="sele1">
<option value="">-请选择 省/直辖市/自治区-</option>
</select>
<select name="sele2">
<option value="">-请选择 市-</option>
</select>
<input type="text" id="int" value="" />
<!---------------------------------------------------------------->
<!--客户端与服务端交互-->
<!---------------------------------------------------------------->
<script type="text/javascript">
var sele1 = document.getElementsByName("sele1")[0];
var sele2 = document.getElementsByName("sele2")[0];
var ints = document.getElementById("int");
//创建xhr对象
var xhr = new XMLHttpRequest();
console.log(xhr)
// 1. 初始化请求
// xhr.open(get/post,url,是否异步默认为true)
xhr.open('get',"js/city.json",true);
// 2. 发送请求
xhr.send();
//监听函数
xhr.onreadystatechange = function(){
if(xhr.status == 200){
if(xhr.readyState == 4){
//得到的响应是json格式的字符串并解析为字面对象
var obj = JSON.parse(xhr.response);
// console.log(obj); //获取到城市代码
var b = obj.城市代码; //将城市代码赋给B
// console.log(b)
for(var i=0; i<b.length; i++){//循环城市代码的长度
var opt = document.createElement('option');//创建空的option
var OPT_ = document.createTextNode(b[i].省);//建立省的文本节点
opt.appendChild(OPT_);//将省的文本节点赋给创建的空的二级菜单
sele1.appendChild(opt);//将二级菜单赋给第一个下拉单
OPT_.value = i;//给省的文本节点的value值赋予下标
// console.log(OPT_.value)
console.log(ints.value);
}
sele1.onchangge = function(){
var index = sele1.selectedIndex;
//selectedIndex 属性可设置或返回下拉列表中被选选项的索引号。
//获取它的下标
var va = sele1.options[index].value;
//option 集合可返回包含 <select> 元素中所有 <option> 的一个数组。
//获取它下面第几个option的value值
var city = b[va].市;
//console.log(city);
sele2.options.length = 1; //清空select下的option的值
for(var i=0; i<city.leng; i++){
var cvc = document.createElement('option');
var CVC_ = document.createTextNode(city[i].市);
cvc.appendChild(CVC_);
sele2.appendChild(cvc);
CVC_.value = i;
ints.value = "";
}
sele2.onchangge = function(){
var sele1v = sele1.value;
var sele2v = sele2.value;
var intes = b[sele1v]['市'][sele2v]['邮编'];
//将城市的下面的市下面的邮编的值赋给intes
ints.value = intes;
}
}
}
}
}
</script>
</body>
</html>
{ "城市代码" : [ { "市" : [ { "市名" : "北京", "编码" : "101010100" }, { "市名" : "朝阳", "编码" : "101010300" }, { "市名" : "顺义", "编码" : "101010400" }, { "市名" : "怀柔", "编码" : "101010500" }, { "市名" : "通州", "编码" : "101010600" }, { "市名" : "昌平", "编码" : "101010700" }, { "市名" : "延庆", "编码" : "101010800" }, { "市名" : "丰台", "编码" : "101010900" }, { "市名" : "石景山", "编码" : "101011000" }, { "市名" : "大兴", "编码" : "101011100" }, { "市名" : "房山", "编码" : "101011200" }, { "市名" : "密云", "编码" : "101011300" }, { "市名" : "门头沟", "编码" : "101011400" }, { "市名" : "平谷", "编码" : "101011500" }, { "市名" : "八达岭", "编码" : "101011600" }, { "市名" : "佛爷顶", "编码" : "101011700" }, { "市名" : "汤河口", "编码" : "101011800" }, { "市名" : "密云上甸子", "编码" : "101011900" }, { "市名" : "斋堂", "编码" : "101012000" }, { "市名" : "霞云岭", "编码" : "101012100" }, { "市名" : "北京城区", "编码" : "101012200" }, { "市名" : "海淀", "编码" : "101010200" } ], "省" : "北京" }, { "市" : [ { "市名" : "天津", "编码" : "101030100" }, { "市名" : "宝坻", "编码" : "101030300" }, { "市名" : "东丽", "编码" : "101030400" }, { "市名" : "西青", "编码" : "101030500" }, { "市名" : "北辰", "编码" : "101030600" }, { "市名" : "蓟县", "编码" : "101031400" }, { "市名" : "汉沽", "编码" : "101030800" }, { "市名" : "静海", "编码" : "101030900" }, { "市名" : "津南", "编码" : "101031000" }, { "市名" : "塘沽", "编码" : "101031100" }, { "市名" : "大港", "编码" : "101031200" }, { "市名" : "武清", "编码" : "101030200" }, { "市名" : "宁河", "编码" : "101030700" } ], "省" : "天津市" }, { "市" : [ { "市名" : "上海", "编码" : "101020100" }, { "市名" : "宝山", "编码" : "101020300" }, { "市名" : "嘉定", "编码" : "101020500" }, { "市名" : "南汇", "编码" : "101020600" }, { "市名" : "浦东", "编码" : "101021300" }, { "市名" : "青浦", "编码" : "101020800" }, { "市名" : "松江", "编码" : "101020900" }, { "市名" : "奉贤", "编码" : "101021000" }, { "市名" : "崇明", "编码" : "101021100" }, { "市名" : "徐家汇", "编码" : "101021200" }, { "市名" : "闵行", "编码" : "101020200" }, { "市名" : "金山", "编码" : "101020700" } ], "省" : "上海" }, { "市" : [ { "市名" : "石家庄", "编码" : "101090101" }, { "市名" : "张家口", "编码" : "101090301" }, { "市名" : "承德", "编码" : "101090402" }, { "市名" : "唐山", "编码" : "101090501" }, { "市名" : "秦皇岛", "编码" : "101091101" }, { "市名" : "沧州", "编码" : "101090701" }, { "市名" : "衡水", "编码" : "101090801" }, { "市名" : "邢台", "编码" : "101090901" }, { "市名" : "邯郸", "编码" : "101091001" }, { "市名" : "保定", "编码" : "101090201" }, { "市名" : "廊坊", "编码" : "101090601" } ], "省" : "河北" }, { "市" : [ { "市名" : "郑州", "编码" : "101180101" }, { "市名" : "新乡", "编码" : "101180301" }, { "市名" : "许昌", "编码" : "101180401" }, { "市名" : "平顶山", "编码" : "101180501" }, { "市名" : "信阳", "编码" : "101180601" }, { "市名" : "南阳", "编码" : "101180701" }, { "市名" : "开封", "编码" : "101180801" }, { "市名" : "洛阳", "编码" : "101180901" }, { "市名" : "商丘", "编码" : "101181001" }, { "市名" : "焦作", "编码" : "101181101" }, { "市名" : "鹤壁", "编码" : "101181201" }, { "市名" : "濮阳", "编码" : "101181301" }, { "市名" : "周口", "编码" : "101181401" }, { "市名" : "漯河", "编码" : "101181501" }, { "市名" : "驻马店", "编码" : "101181601" }, { "市名" : "三门峡", "编码" : "101181701" }, { "市名" : "济源", "编码" : "101181801" }, { "市名" : "安阳", "编码" : "101180201" } ], "省" : "河南" }, { "市" : [ { "市名" : "合肥", "编码" : "101220101" }, { "市名" : "芜湖", "编码" : "101220301" }, { "市名" : "淮南", "编码" : "101220401" }, { "市名" : "马鞍山", "编码" : "101220501" }, { "市名" : "安庆", "编码" : "101220601" }, { "市名" : "宿州", "编码" : "101220701" }, { "市名" : "阜阳", "编码" : "101220801" }, { "市名" : "亳州", "编码" : "101220901" }, { "市名" : "黄山", "编码" : "101221001" }, { "市名" : "滁州", "编码" : "101221101" }, { "市名" : "淮北", "编码" : "101221201" }, { "市名" : "铜陵", "编码" : "101221301" }, { "市名" : "宣城", "编码" : "101221401" }, { "市名" : "六安", "编码" : "101221501" }, { "市名" : "巢湖", "编码" : "101221601" }, { "市名" : "池州", "编码" : "101221701" }, { "市名" : "蚌埠", "编码" : "101220201" } ], "省" : "安徽" }, { "市" : [ { "市名" : "杭州", "编码" : "101210101" }, { "市名" : "舟山", "编码" : "101211101" }, { "市名" : "湖州", "编码" : "101210201" }, { "市名" : "嘉兴", "编码" : "101210301" }, { "市名" : "金华", "编码" : "101210901" }, { "市名" : "绍兴", "编码" : "101210501" }, { "市名" : "台州", "编码" : "101210601" }, { "市名" : "温州", "编码" : "101210701" }, { "市名" : "丽水", "编码" : "101210801" }, { "市名" : "衢州", "编码" : "101211001" }, { "市名" : "宁波", "编码" : "101210401" } ], "省" : "浙江" }, { "市" : [ { "市名" : "重庆", "编码" : "101040100" }, { "市名" : "合川", "编码" : "101040300" }, { "市名" : "南川", "编码" : "101040400" }, { "市名" : "江津", "编码" : "101040500" }, { "市名" : "万盛", "编码" : "101040600" }, { "市名" : "渝北", "编码" : "101040700" }, { "市名" : "北碚", "编码" : "101040800" }, { "市名" : "巴南", "编码" : "101040900" }, { "市名" : "长寿", "编码" : "101041000" }, { "市名" : "黔江", "编码" : "101041100" }, { "市名" : "万州天城", "编码" : "101041200" }, { "市名" : "万州龙宝", "编码" : "101041300" }, { "市名" : "涪陵", "编码" : "101041400" }, { "市名" : "开县", "编码" : "101041500" }, { "市名" : "城口", "编码" : "101041600" }, { "市名" : "云阳", "编码" : "101041700" }, { "市名" : "巫溪", "编码" : "101041800" }, { "市名" : "奉节", "编码" : "101041900" }, { "市名" : "巫山", "编码" : "101042000" }, { "市名" : "潼南", "编码" : "101042100" }, { "市名" : "垫江", "编码" : "101042200" }, { "市名" : "梁平", "编码" : "101042300" }, { "市名" : "忠县", "编码" : "101042400" }, { "市名" : "石柱", "编码" : "101042500" }, { "市名" : "大足", "编码" : "101042600" }, { "市名" : "荣昌", "编码" : "101042700" }, { "市名" : "铜梁", "编码" : "101042800" }, { "市名" : "璧山", "编码" : "101042900" }, { "市名" : "丰都", "编码" : "101043000" }, { "市名" : "武隆", "编码" : "101043100" }, { "市名" : "彭水", "编码" : "101043200" }, { "市名" : "綦江", "编码" : "101043300" }, { "市名" : "酉阳", "编码" : "101043400" }, { "市名" : "秀山", "编码" : "101043600" }, { "市名" : "沙坪坝", "编码" : "101043700" }, { "市名" : "永川", "编码" : "101040200" } ], "省" : "重庆" }, { "市" : [ { "市名" : "福州", "编码" : "101230101" }, { "市名" : "泉州", "编码" : "101230501" }, { "市名" : "漳州", "编码" : "101230601" }, { "市名" : "龙岩", "编码" : "101230701" }, { "市名" : "晋江", "编码" : "101230509" }, { "市名" : "南平", "编码" : "101230901" }, { "市名" : "厦门", "编码" : "101230201" }, { "市名" : "宁德", "编码" : "101230301" }, { "市名" : "莆田", "编码" : "101230401" }, { "市名" : "三明", "编码" : "101230801" } ], "省" : "福建" }, { "市" : [ { "市名" : "兰州", "编码" : "101160101" }, { "市名" : "平凉", "编码" : "101160301" }, { "市名" : "庆阳", "编码" : "101160401" }, { "市名" : "武威", "编码" : "101160501" }, { "市名" : "金昌", "编码" : "101160601" }, { "市名" : "嘉峪关", "编码" : "101161401" }, { "市名" : "酒泉", "编码" : "101160801" }, { "市名" : "天水", "编码" : "101160901" }, { "市名" : "武都", "编码" : "101161001" }, { "市名" : "临夏", "编码" : "101161101" }, { "市名" : "合作", "编码" : "101161201" }, { "市名" : "白银", "编码" : "101161301" }, { "市名" : "定西", "编码" : "101160201" }, { "市名" : "张掖", "编码" : "101160701" } ], "省" : "甘肃" }, { "市" : [ { "市名" : "广州", "编码" : "101280101" }, { "市名" : "惠州", "编码" : "101280301" }, { "市名" : "梅州", "编码" : "101280401" }, { "市名" : "汕头", "编码" : "101280501" }, { "市名" : "深圳", "编码" : "101280601" }, { "市名" : "珠海", "编码" : "101280701" }, { "市名" : "佛山", "编码" : "101280800" }, { "市名" : "肇庆", "编码" : "101280901" }, { "市名" : "湛江", "编码" : "101281001" }, { "市名" : "江门", "编码" : "101281101" }, { "市名" : "河源", "编码" : "101281201" }, { "市名" : "清远", "编码" : "101281301" }, { "市名" : "云浮", "编码" : "101281401" }, { "市名" : "潮州", "编码" : "101281501" }, { "市名" : "东莞", "编码" : "101281601" }, { "市名" : "中山", "编码" : "101281701" }, { "市名" : "阳江", "编码" : "101281801" }, { "市名" : "揭阳", "编码" : "101281901" }, { "市名" : "茂名", "编码" : "101282001" }, { "市名" : "汕尾", "编码" : "101282101" }, { "市名" : "韶关", "编码" : "101280201" } ], "省" : "广东" }, { "市" : [ { "市名" : "南宁", "编码" : "101300101" }, { "市名" : "柳州", "编码" : "101300301" }, { "市名" : "来宾", "编码" : "101300401" }, { "市名" : "桂林", "编码" : "101300501" }, { "市名" : "梧州", "编码" : "101300601" }, { "市名" : "防城港", "编码" : "101301401" }, { "市名" : "贵港", "编码" : "101300801" }, { "市名" : "玉林", "编码" : "101300901" }, { "市名" : "百色", "编码" : "101301001" }, { "市名" : "钦州", "编码" : "101301101" }, { "市名" : "河池", "编码" : "101301201" }, { "市名" : "北海", "编码" : "101301301" }, { "市名" : "崇左", "编码" : "101300201" }, { "市名" : "贺州", "编码" : "101300701" } ], "省" : "广西" }, { "市" : [ { "市名" : "贵阳", "编码" : "101260101" }, { "市名" : "安顺", "编码" : "101260301" }, { "市名" : "都匀", "编码" : "101260401" }, { "市名" : "兴义", "编码" : "101260906" }, { "市名" : "铜仁", "编码" : "101260601" }, { "市名" : "毕节", "编码" : "101260701" }, { "市名" : "六盘水", "编码" : "101260801" }, { "市名" : "遵义", "编码" : "101260201" }, { "市名" : "凯里", "编码" : "101260501" } ], "省" : "贵州" }, { "市" : [ { "市名" : "昆明", "编码" : "101290101" }, { "市名" : "红河", "编码" : "101290301" }, { "市名" : "文山", "编码" : "101290601" }, { "市名" : "玉溪", "编码" : "101290701" }, { "市名" : "楚雄", "编码" : "101290801" }, { "市名" : "普洱", "编码" : "101290901" }, { "市名" : "昭通", "编码" : "101291001" }, { "市名" : "临沧", "编码" : "101291101" }, { "市名" : "怒江", "编码" : "101291201" }, { "市名" : "香格里拉", "编码" : "101291301" }, { "市名" : "丽江", "编码" : "101291401" }, { "市名" : "德宏", "编码" : "101291501" }, { "市名" : "景洪", "编码" : "101291601" }, { "市名" : "大理", "编码" : "101290201" }, { "市名" : "曲靖", "编码" : "101290401" }, { "市名" : "保山", "编码" : "101290501" } ], "省" : "云南" }, { "市" : [ { "市名" : "呼和浩特", "编码" : "101080101" }, { "市名" : "乌海", "编码" : "101080301" }, { "市名" : "集宁", "编码" : "101080401" }, { "市名" : "通辽", "编码" : "101080501" }, { "市名" : "阿拉善左旗", "编码" : "101081201" }, { "市名" : "鄂尔多斯", "编码" : "101080701" }, { "市名" : "临河", "编码" : "101080801" }, { "市名" : "锡林浩特", "编码" : "101080901" }, { "市名" : "呼伦贝尔", "编码" : "101081000" }, { "市名" : "乌兰浩特", "编码" : "101081101" }, { "市名" : "包头", "编码" : "101080201" }, { "市名" : "赤峰", "编码" : "101080601" } ], "省" : "内蒙古" }, { "市" : [ { "市名" : "南昌", "编码" : "101240101" }, { "市名" : "上饶", "编码" : "101240301" }, { "市名" : "抚州", "编码" : "101240401" }, { "市名" : "宜春", "编码" : "101240501" }, { "市名" : "鹰潭", "编码" : "101241101" }, { "市名" : "赣州", "编码" : "101240701" }, { "市名" : "景德镇", "编码" : "101240801" }, { "市名" : "萍乡", "编码" : "101240901" }, { "市名" : "新余", "编码" : "101241001" }, { "市名" : "九江", "编码" : "101240201" }, { "市名" : "吉安", "编码" : "101240601" } ], "省" : "江西" }, { "市" : [ { "市名" : "武汉", "编码" : "101200101" }, { "市名" : "黄冈", "编码" : "101200501" }, { "市名" : "荆州", "编码" : "101200801" }, { "市名" : "宜昌", "编码" : "101200901" }, { "市名" : "恩施", "编码" : "101201001" }, { "市名" : "十堰", "编码" : "101201101" }, { "市名" : "神农架", "编码" : "101201201" }, { "市名" : "随州", "编码" : "101201301" }, { "市名" : "荆门", "编码" : "101201401" }, { "市名" : "天门", "编码" : 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