Implementation of three-level linkage between provinces and municipalities using picker in WeChat mini program

<?php 
header("Content-type: text/html; charset=utf-8");  
 
$type=$_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, "name"=>$name, "fcode"=>$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); 
 
 
?>

<template name="city"> 
<view class="areas"> 
 <view class="province"> 
  <picker bindchange="provincePickerChange" value="{{provinceIndex}}" range="{{province.name}}" data-city-url="{{cityUrl}}"> 
  <text class="select-item">{{province.name[provinceIndex]}}</text> 
  </picker> 
 </view> 
 
 <view class="city"> 
 <block wx:if="{{!city.name.length}}"> --二级市区-- </block> 
 <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]}}</text> 
  </picker> 
 </block> 
 </view> 
 
 <view class="county"> 
 <block wx:if="{{!county.name.length}}"> --三级地区-- </block> 
 <block wx:if="{{county.name.length>0}}"> 
  <picker bindchange="countyPickerChange" value="{{countyIndex}}" range="{{county.name}}"> 
   <text class="select-item">{{county.name[countyIndex]}}</text> 
  </picker> 
 </block> 
 </view> 
 
</view> 
</template>

/** 
 * 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_cbSuccess, g_cbSuccessErr, g_cbFail, g_cbComplete, g_header, 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_datd, g_cbSuccess, g_cbSuccessErr, g_cbFail, g_cbComplete, g_header, 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_datd, g_cbSuccess, g_cbSuccessErr, g_cbFail, g_cbComplete, g_header, 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_url, p_data){ 
  g_cbSuccess = function( res ) { 
   that.setData( { 
    'city.province': res 
   }); 
  }; 
  net.r( p_url, p_data, g_cbSuccess, g_cbSuccessErr, g_cbFail, g_cbComplete, g_header, g_method ); 
} 
 
module.exports={ 
  initCityFun: initCityFun, 
  getProvinceFun: getProvinceFun 
}

/** 
 * 网络发送http请求,默认为返回类型为json 
 *  
 * url: 必须,其他参数非必须 接口地址 
 * data:请求的参数 Object或String 
 * successFun(dts):成功返回的回调函数，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"/> 
<template is="city" data="{{...city}}" />

var city = require( '../../common/cityTemplate' ); 
Page( { 
 data: { 
 
 }, 
 onLoad: function( options ) { 
  var _that = this; 
  //创建三级联动数据对象 ---- 这个city对象是固定的，只有请求的url是根据各自的服务端地址来更改的 
  _that.setData( { 
   city: { 
    province: {},//格式province:{code: ["11000", "12000"], name: ["北京市", "上海市"]},只能固定是name和code，因为模板需要根据这俩参数显示 
    city: {}, 
    county: {}, 
    provinceIndex: 0, 
    cityIndex: 0, 
    countyIndex: 0, 
    cityUrl: "http://localhost:8282/phpserver/areas.php?type=city&fcode=",//type表示获取地区 fcode是一级code码，到时具体根据后端请求参数修改 
    countyUrl: "http://localhost:8282/phpserver/areas.php?type=county&fcode=" 
   } 
  }) 
  var _url = "http://localhost:8282/phpserver/areas.php"; 
  var _data = { 'type': 'province', 'fcode': '0' }; 
  city.initCityFun( _that, _url, _data ); 
 } 
})