话不多说我们先来一张效果图给大家看一下：
html代码如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>城市三级联动 - citys-原生js封装</title>
<link rel="shortcut icon" href="../public/image/favicon.ico" type="images/x-icon"/>
<link rel="icon" href="../public/image/favicon.png" type="images/png"/>
<link rel="stylesheet" type="text/css" href="../public/style/cssreset-min.css">
<link rel="stylesheet" type="text/css" href="../public/style/common.css">
<style type="text/css">
/*公共*/
html{
height:100%;
}
body, div, dl, dt, dd, ul, ol, li, h1, h2, h3, h4, h5, h6, pre, code, form, fieldset, legend, input, textarea, p, blockquote, th, td {
margin: 0;
padding: 0
}
ol, ul {
list-style: none
}
body{
position: relative;
min-height:100%;
font-size:14px;
font-family: Tahoma, Verdana,"Microsoft Yahei";
color:#333;
}
a{
text-decoration: none;
color:#333;
}
.header{
960px;
padding-top: 15px;
margin: 0 auto;
line-height: 30px;
text-align: right;
}
.header a{
margin: 0 5px;
}
.main{
960px;
margin: 50px auto 0;
}
.code{
border:1px dashed #e2e2e2;
padding:10px 5px;
margin-bottom:25px;
}
pre {
font-family: "Microsoft Yahei",Arial,Helvetica;
white-space: pre-wrap; /*css-3*/
white-space: -moz-pre-wrap; /*Mozilla,since1999*/
white-space: -pre-wrap; /*Opera4-6*/
white-space: -o-pre-wrap; /*Opera7*/
word-wrap: break-word; /*InternetExplorer5.5+*/
}
.example{
padding-top:40px;
margin-bottom:90px;
}
.example .call{
padding:18px 5px;
background:#f0f5f8;
}
.example h2{
padding-top:20px;
margin-bottom:7px;
}
.example table {
100%;
table-layout:fixed;
border-collapse: collapse;
border-spacing: 0;
border: 1px solid #cee1ee;
border-left: 0;
}
.example thead {
border-bottom: 1px solid #cee1ee;
background-color: #e3eef8;
}
.example tr {
line-height: 24px;
font-size: 13px;
}
.example tr:nth-child(2n) {
background-color: #f0f5f8;
}
.example tr th,.example tr td {
border-left: 1px solid #cee1ee;
word-break: break-all;
word-wrap: break-word;
padding:0 10px;
font-weight: normal;
}
.example tr th {
color: #555;
padding-top: 2px;
padding-bottom: 2px;
text-align: left;
}
/*公共*/
.citys{
margin-bottom: 10px;
}
.citys p{
line-height: 28px;
}
.warning{
color: #c00;
}
table a{
margin-right: 8px;
color: #369;
}
</style>
<script type="text/javascript">
/*封装代码*/
(function() {
var Citys = function(el, opts,getApi) {
var self = this;
var defaults = {
dataUrl:'http://www.huanghanlian.com/data_location/list.json', //数据库地址
provinceField:'province', //省份字段名
cityField:'city', //城市字段名
areaField:'area', //地区字段名
province:'', //省份名称
city:'', //城市名称
area:'', //地区名称
required: true, //是否必须选一个
nodata: 'hidden', //当无数据时的表现形式:'hidden'隐藏,'disabled'禁用,为空不做任何处理
onChange:function(){} //地区切换时触发,回调函数传入地区数据
}
opts = opts || {};
getApi = getApi||function(){};
for (var w in defaults) {
if ("undefined" == typeof opts[w]) {
opts[w] = defaults[w];
}
}
this.options = opts;
this.container = r(el);
if (this.container.length > 1) {
var x = [];
return this.container.each(function() {
x.push(new Citys(this, opts,getApi))
}), x
}
this.$this = this.container;
this.$province = this.$this.find('select[name="'+this.options.provinceField+'"]'),
this.$city = this.$this.find('select[name="'+this.options.cityField+'"]'),
this.$area = this.$this.find('select[name="'+this.options.areaField+'"]');
this.data;
this.state=false;
this.province = [];
this.city = [];
this.area = [];
var request = new XMLHttpRequest();
request.open("GET", self.options.dataUrl, true);
request.send();
request.onreadystatechange = function() {
if (request.readyState === 4) {
if (request.status === 200) {
self.data=JSON.parse(request.responseText);
self.init();
} else {
alert("发生错误：" + request.status);
}
}
}
getApi(this);
}
Citys.prototype = {
updateData:function(){
var self = this;
for (var i = 0; i < this.data.length; i++) {
this.province[i]=this.data[i].name;
for (var j = 0; j < this.data[i].city.length; j++) {
if(this.options.province==this.data[i].name){
this.city[j]=this.data[i].city[j].name;
if(self.options.required && !self.options.city){
self.options.city = this.city[0];
}
for (var l = 0; l < this.data[i].city[j].area.length; l++) {
if(this.options.city==this.data[i].city[j].name){
this.area[l]=this.data[i].city[j].area[l];
if(self.options.required && !self.options.area){
//console.log(this.area[0])
self.options.area = this.area[0];
}
}
}
}
}
}
},
provinces:function() {
var self = this;
if (!self.options.required) {
self.$province.append('<option value=""> - 请选择 - </option>');
}
for (var i=0;i < this.province.length;i++) {
self.$province.append('<option value="' + this.province[i] + '">' + this.province[i] + '</option>');
}
if (self.options.province) {
self.$province[0].value=self.options.province;//(self.options.province);
}
this.citys();
},
citys:function(){
var self = this;
emptys(self.$city[0])
if (!self.options.required) {
self.$city.append('<option value=""> - 请选择 - </option>');
}
if (self.options.nodata == 'disabled') {
if(!isEmptyObject(self.city.length)){
self.$city[0].setAttribute('disabled',true);
}else{
self.$city[0].removeAttribute('disabled')
}
} else if (self.options.nodata == 'hidden') {
if(!isEmptyObject(self.city.length)){
self.$city[0].style.display = "none";
}else{
self.$city[0].style.display = "";
}
}
for (var i=0;i < this.city.length;i++) {
self.$city.append('<option value="' + this.city[i] + '">' + this.city[i] + '</option>');
}
if (self.options.city) {
self.$city[0].value=self.options.city;
}
this.areas();
},
areas:function(){
var self = this;
emptys(self.$area[0])
if (!self.options.required) {
self.$area.append('<option value=""> - 请选择 - </option>');
}
if (!isEmptyObject(self.city.length)) {
self.$area[0].style.display = "none";
} else {
self.$area[0].style.display = "";
if (self.options.nodata == 'disabled') {
if (!isEmptyObject(self.area.length)) {
self.$area[0].setAttribute('disabled', true);
} else {
self.$area[0].removeAttribute('disabled')
}
} else if (self.options.nodata == 'hidden') {
if (!isEmptyObject(self.area.length)) {
self.$area[0].style.display = "none";
} else {
self.$area[0].style.display = "";
}
}
}
for (var i=0;i < this.area.length;i++) {
self.$area.append('<option value="' + this.area[i] + '">' + this.area[i] + '</option>');
}
if (self.options.area) {
self.$area[0].value=self.options.area;
}
},
//获取当前地理信息
getInfo:function() {
var self = this;
var status = {
province: self.options.province || '',
city: self.options.city || '',
area: self.options.area || '',
};
return status;
},
//事件绑定
event: function() {
var self = this;
this.$province[0].addEventListener("change", function() {
self.options.province = self.$province[0].value;
self.options.city = "";
self.options.area = "";
self.city.length=0;
self.area.length=0;
self.updateData();
self.citys();
self.options.onChange(self.getInfo());
}, false);
this.$city[0].addEventListener("change", function() {
self.options.city = self.$city[0].value;
self.options.area = "";
self.area.length=0;
self.updateData();
self.areas();
self.options.onChange(self.getInfo());
}, false);
this.$area[0].addEventListener("change", function() {
self.options.area = self.$area[0].value;
self.options.onChange(self.getInfo());
}, false);
},
//初始化
init: function() {
var self = this;
//渲染dom
this.updateData();
self.provinces();
this.event();
},
}
function getStyle(obj, attr) {
if (obj.currentStyle) {
return obj.currentStyle[attr];
} else {
return getComputedStyle(obj, false)[attr];
}
}
//清空元素
function emptys(selector){
while (selector.firstChild){
selector.removeChild(selector.firstChild);
}
}
//判断真假
function isEmptyObject(obj){
if(obj){
return true;
}else{
return false;
}
}
var r = (function() {
var e = function(e) {
var a = this,
t = 0;
for (t = 0; t < e.length; t++) {
a[t] = e[t];
}
return a.length = e.length, this
};
e.prototype = {
addClass: function(e) {
if ("undefined" == typeof e) return this;
for (var a = e.split(" "), t = 0; t < a.length; t++)
for (var r = 0; r < this.length; r++) this[r].classList.add(a[t]);
return this
},
each: function(e) {
for (var a = 0; a < this.length; a++) e.call(this[a], a, this[a]);
return this
},
html: function(e) {
if ("undefined" == typeof e) return this[0] ? this[0].innerHTML : void 0;
for (var a = 0; a < this.length; a++) this[a].innerHTML = e;
return this
},
find: function(a) {
for (var t = [], r = 0; r < this.length; r++)
for (var i = this[r].querySelectorAll(a), s = 0; s < i.length; s++) t.push(i[s]);
return new e(t)
},
append: function(a) {
var t, r;
for (t = 0; t < this.length; t++)
if ("string" == typeof a) {
var i = document.createElement("div");
for (i.innerHTML = a; i.firstChild;) this[t].appendChild(i.firstChild)
} else if (a instanceof e)
for (r = 0; r < a.length; r++) this[t].appendChild(a[r]);
else this[t].appendChild(a);
return this
},
}
var a = function(a, t) {
var r = [],
i = 0;
if (a && !t && a instanceof e) {
return a;
}
if (a) {
if ("string" == typeof a) {
var s, n, o = a.trim();
if (o.indexOf("<") >= 0 && o.indexOf(">") >= 0) {
var l = "div";
for (0 === o.indexOf("<li") && (l = "ul"), 0 === o.indexOf("<tr") && (l = "tbody"), (0 === o.indexOf("<td") || 0 === o.indexOf("<th")) && (l = "tr"), 0 === o.indexOf("<tbody") && (l = "table"), 0 === o.indexOf("<option") && (l = "select"), n = document.createElement(l), n.innerHTML = a, i = 0; i < n.childNodes.length; i++) r.push(n.childNodes[i])
} else
for (s = t || "#" !== a[0] || a.match(/[ .<>:~]/) ? (t || document).querySelectorAll(a) : [document.getElementById(a.split("#")[1])], i = 0; i < s.length; i++) s[i] && r.push(s[i])
} else if (a.nodeType || a === window || a === document) {
r.push(a);
} else if (a.length > 0 && a[0].nodeType) {
for (i = 0; i < a.length; i++) {
r.push(a[i]);
}
}
}
return new e(r)
};
return a;
}())
window.citys = Citys;
})()
/*封装代码*/
</script>
</head>
<body>
<div class="header">
<a href="https://github.com/huanghanzhilian/widget" target="_blank">项目地址</a>
<a href="/widget/">返回首页</a>
</div>
<div class="main">
</script>
<div id="demo1" class="citys">
<p>
<select name="province"></select>
<select name="city"></select>
<select name="area"></select>
</p>
</div>
<div class="code">
<p>通过地区名称初始化设置</p>
<pre>
new citys("#demo1", {
province: '江西',
city: '抚州',
area: '宜黄县',
});
</pre>
</div>
<script type="text/javascript">
new citys("#demo1", {
province: '江西',
city: '抚州',
area: '宜黄县',
});
</script>
<div id="demo2" class="citys">
<p>
<select name="province"></select>
<select name="city"></select>
<select name="area"></select>
</p>
<p id="place">请选择地区</p>
</div>
<div class="code">
<p>事件处理</p>
<pre>
var place=document.getElementById("place")
new citys("#demo2", {
required: false,
nodata:'disabled',
onChange:function(data){
place.innerHTML='当前选中地区：'+data['province']+' '+data['city']+' '+data['area'];
}
});
</pre>
</div>
<script type="text/javascript">
var place=document.getElementById("place")
new citys("#demo2", {
required: false,
nodata:'disabled',
onChange:function(data){
place.innerHTML='当前选中地区：'+data['province']+' '+data['city']+' '+data['area'];
}
});
</script>
<div id="demo3" class="citys">
<p>
<select name="province"></select>
<select name="city"></select>
<select name="area"></select>
</p>
<p id="place3">请选择地区</p>
</div>
<div class="code">
<p>事件处理</p>
<pre>
var place=document.getElementById("place")
new citys("#demo2", {
required: false,
nodata:'disabled',
onChange:function(data){
place3.innerHTML='当前选中地区：'+data['province']+' '+data['city']+' '+data['area'];
}
});
</pre>
</div>
<script type="text/javascript">
var place3=document.getElementById("place3")
new citys("#demo3", {
required: false,
onChange:function(data){
place3.innerHTML='当前选中地区：'+data['province']+' '+data['city']+' '+data['area'];
}
});
</script>
<div class="example">
<div class="call">
<h1>调用方法：</h1>
<p>new citys("selector",options,callback(api));</p>
</div>
<h2> options参数</h2>
<table>
<thead>
<tr>
<th width="150">参数</th>
<th width="120">默认值</th>
<th>说明</th>
</tr>
</thead>
<tbody>
<tr>
<td>dataUrl</td>
<td>[数据库地址]</td>
<td>
<p>最新数据库（2016年08月）：<a href="http://www.huanghanlian.com/data_location/list.json" target="_blank">JSON格式</a></p>
<p>数据库项目：<a href="https://github.com/huanghanzhilian/data_location" target="_blank">中国行政区划</a></p>
</td>
</tr>
<tr>
<td>provinceField</td>
<td>'province'</td>
<td>省份(省级)字段名</td>
</tr>
<tr>
<td>cityField</td>
<td>'city'</td>
<td>城市(地级)字段名</td>
</tr>
<tr>
<td>areaField</td>
<td>'area'</td>
<td>地区(县区级)字段名</td>
</tr>
<tr>
<td>province</td>
<td>[无]</td>
<td>省份(省级),可以为地区名称</td>
</tr>
<tr>
<td>city</td>
<td>[无]</td>
<td>城市(地级),可以为地区名称</td>
</tr>
<tr>
<td>area</td>
<td>[无]</td>
<td>地区(县区级),可以为地区名称</td>
</tr>
<tr>
<td>required</td>
<td>true</td>
<td>是否必须选中(是否自动选择地区)</td>
</tr>
<tr>
<td>nodata</td>
<td>'hidden'</td>
<td>当无数据时的表现形式:'hidden'隐藏,'disabled'禁用,为空不做任何处理</td>
</tr>
<tr>
<td>onChange</td>
<td>[无]</td>
<td>地区切换时触发,回调函数传入地区信息:province省份(省级)名称,city城市(地级)名称,area地区(县区级)名称</td>
</tr>
</tbody>
</table>
<h2>callback(api)参数</h2>
<table>
<thead>
<tr>
<th width="200">方法</th>
<th>说明</th>
</tr>
</thead>
<tbody>
<tr>
<td>getInfo(data)</td>
<td>获取当前选中的地区信息:province省份(省级)名称,city城市(地级)名称,area地区(县区级)名称,code地区编码</td>
</tr>
</tbody>
</table>
</div>
</div>
</body>
</html>