微信小程序 使用picker封装省市区三级联动实例代码

$type=$_REQUEST["type"];//获取省市区的标志
$fcode=$_GET["fcode"];

$retArr=[
"status"=>true,"data"=>[],"msg"=>""
];

if($type!="province" && $type!="city" && $type!="county"){
$retArr["status"]=false;
$retArr["msg"]="获取地区类型错误，请检查";

echo json_encode($retArr);
exit;
}

function getProvince(){
$province=[];
$code=["110000","350000","710000"];
$province["code"]=$code;
$name=["北京市","福建省","台湾省"];
$province["name"]=$name;
$fcode=["0","0","0"];
$province["fcode"]=$fcode;
return $province;
}
function getCity($P_fcode){
$city=[];
$code=[];
$name=[];
$fcode=[];
if($P_fcode=="110000"){
$code=["110100"];
$name=["北京市"];
$fcode=$P_fcode;
}
if($P_fcode=="350000"){
$code=["350100","350200","350300","350400","350500","350600","350700","350800","350900"];
$name=["福州市","厦门市","莆田市","三明市","泉州市","漳州市","南平市","龙岩市","宁德市"];
$fcode=$P_fcode;
}
if($P_fcode=="710000"){

}
$city=["code"=>$code,"name"=>$name,"fcode"=>$fcode];
return $city;
}
function getCounty($P_fcode){
$county=[];
$code=[];
$name=[];
$fcode=[];
if($P_fcode=="110100"){
$code=["110101","110102","110103","110104","110105","110106","110107"];
$name=["东城区","西城区","崇文区","宣武区","朝阳区","丰台区","石景山区"];
$fcode=$P_fcode;
}
if($P_fcode=="350100"){
$code=["350102","350103","350104"];
$name=["鼓楼区","台江区","苍山区"];
$fcode=$P_fcode;
}
if($P_fcode=="350200"){
$code=["350203","350205","350206"];
$name=["思明区","海沧区","湖里区"];
$fcode=$P_fcode;
}
$county=["code"=>$code,"fcode"=>$fcode];
return $county;
}

//var_dump($province);
if($type=="province"){
$province=getProvince();
$retArr["data"]=$province;
}else if($type=="city"){
$city=getCity($fcode);
$retArr["data"]=$city;
}else if($type="county"){
$county=getCounty($fcode);
$retArr["data"]=$county;
}

echo json_encode($retArr);

?>

<view class="city">
<block wx:if="{{!city.name.length}}"> --二级市区--
<block wx:if="{{city.name.length>0}}">
<picker bindchange="cityPickerChange" value="{{cityIndex}}" range="{{city.name}}" data-county-url="{{countyUrl}}">
<text class="select-item">{{city.name[cityIndex]}}

<view class="county">
<block wx:if="{{!county.name.length}}"> --三级地区--
<block wx:if="{{county.name.length>0}}">
<picker bindchange="countyPickerChange" value="{{countyIndex}}" range="{{county.name}}">
<text class="select-item">{{county.name[countyIndex]}}

获取三级联动的三个函数 * that: 注册页面的this实例 必填 * p_url: 一级省份url 必填 * p_data：一级省份参数 选填 */ var net = require( "net" );//引入request方法 var g_url,g_datd,g_cbSuccess,g_cbSuccessErr,g_cbFail,g_cbComplete,g_header,g_method;

function initCityFun( that,p_url,p_data ) {
//获取一级省份数据
g_cbSuccess = function( res ) {
that.setData( {
'city.province': res
});
};
net.r( p_url,p_data,g_method );

//点击一级picker触发事件并获取市区方法
var changeProvince = function( e ) {
that.setData( {
'city.provinceIndex': e.detail.value
});
var _fcode = that.data.city.province.code[ e.detail.value ];
if( !_fcode ) {
_fcode = 0;
}
var _cityUrl = e.target.dataset.cityUrl;

g_url = _cityUrl + _fcode; 
g_cbSuccess = function( res ) { 
  that.setData( { 
    'city.city': res 
  }); 
} 
net.r( g_url,g_method ); 

};
that[ "provincePickerChange" ] = changeProvince;

//点击二级picker触发事件并获取地区方法
var changeCity = function( e ) {
that.setData( {
'city.cityIndex': e.detail.value
});
var _fcode = that.data.city.city.code[ e.detail.value ];
if( !_fcode ) {
_fcode = 0;
}
var _countyUrl = e.target.dataset.countyUrl;
g_url = _countyUrl + _fcode;

g_cbSuccess = function( res ) { 
  that.setData( { 
    'city.county': res 
  }); 
}; 
net.r( g_url,g_method ); 

};
that[ "cityPickerChange" ] = changeCity;

//点击三级picker触发事件
var changeCounty = function( e ) {
that.setData( {
'city.countyIndex': e.detail.value
});
};
that["countyPickerChange"]=changeCounty;
}

function getProvinceFun(that,p_data){
g_cbSuccess = function( res ) {
that.setData( {
'city.province': res
});
};
net.r( p_url,g_method );
}

module.exports={
initCityFun: initCityFun,getProvinceFun: getProvinceFun
}

函数，已自动过滤微信端添加数据,按接口约定,返回成功后的data数据,过滤掉msg和status * successErrorFun(msg):成功执行请求,但是服务端认为业务错误,执行其他行为,默认弹出系统提示信息. * failFun:接口调用失败的回调函数 * completeFun:接口调用结束的回调函数（调用成功、失败都会执行） * header:object,设置请求的 header,header 中不能设置 Referer * method:默认为 GET，有效值：OPTIONS,GET,HEAD,POST,PUT,DELETE,TRACE,CONNECT * */ function r( url,data,successFun,successErrorFun,failFun,completeFun,header,method ) { var reqObj = {}; reqObj.url = url; reqObj.data = data;

//默认头为json
reqObj.header = { 'Content-Type': 'application/json' };
if( header ) {
//覆盖header
reqObj.header = header;
}

if( method ) {
reqObj.method = method;
}
reqObj.success = function( res ) {
var returnData = res.data; //将微信端结果过滤,获取服务端返回的原样数据
var status = returnData.status; //按接口约定,返回status时,才调用成功函数
//console.log(res);
//正常执行的业务函数
if( status == true ) {
if( successFun ) {
var dts = returnData.data;
successFun( dts );//回调，相当于获取到data后直接在回调里面处理赋值数据
}
} else if( status == false ) {
var msg = returnData.msg;
if( !successErrorFun ) {
console.log( msg );
} else {
successErrorFun( msg );
}

} else { 
  console.log( "服务端没有按照接口约定格式返回数据" ); 
} 

}
reqObj.fail = function( res ) {
if( failFun ) {
failFun( res );
}
}
reqObj.complete = function( res ) {
if( completeFun ) {
completeFun( res );
}
}

wx.request( reqObj );
}

module.exports = {
r: r
}

<import src="../../template/cityTemplate.wxml"/>