城市级联选择优化：H5使用的vant，后管使用Element

1，问题

H5使用的vant，后管使用Element，两个组件所使用的的数据源不一样，导致两端的级联选择问题。
解决方案 ：将vant的资源库处理为element需要的数据。

2，操作

//vant的数据源
var areaList = {}

let regionData = [];

const areaFormat= () =>{
  let _this = this,
    cityNum = '',
    countyNum = '';

  for (let p in areaList.province_list) {
    let province_option = {
      value: p,

      label: areaList.province_list[p],

      children: [],
    };

    regionData.push(province_option);
  }

  for (let c in areaList.city_list) {
    let city_option = {
      value: c,

      label: areaList.city_list[c],

      children: [],
    };

    //城市与省会的索引差介于100到10000

    regionData.map((item, index) => {
      let diff = c - parseInt(item.value);

      if (diff < 10000 && diff > 99 && index < 34) {
        regionData[index].children.push(city_option);
      }

      //这里是外国数据

      if (index > 33 && c > 900000) {
        regionData[index].children.push({
          value: c,

          label: areaList.city_list[c],
        });
      }
    });
  }

  //城市与城区的索引差小于100

  for (let t in areaList.county_list) {
    let county_option = {
      value: t,

      label: areaList.county_list[t],
    };

    regionData.map((item, index) => {
      item.children.map((itemChild, indexChild) => {
        let diff = t - parseInt(itemChild.value);

        if (diff > 0 && diff < 100) {
          regionData[index].children[indexChild].children.push(county_option);
        }
      });
    });
  }
};
areaFormat()
export default areaFormat;

处理后的数据就变为树结构了：

h5选择地址后存为两个字段：birthProv, birthCity

因为element选择完地址后返回的地址格式为一个数组：结构类似于 ['110000','110001','110002']，而且数据库存的值为一个中文字符
所以还需要封装两个函数来转换code和地址中文。

import regionData from './area-data';
import { ref } from 'vue';

const Code2Area = (curAreaList: string[]) => {
  const province = curAreaList[0];
  const city = curAreaList[1];
  const county = curAreaList[2];
  //获取到省份的总体数据
  const res_province = regionData.filter((val) => val.value == province);
  console.log(res_province);
  //在省份里递归找到市
  const res_city = res_province[0].children.filter((val) => val.value == city);
  //在市里面递归找到区、县
  const res_county = res_city[0].children.filter((val) => val.value == county);
  return {
    province: res_province[0]?.label,
    city: res_city[0]?.label,
    county: res_county[0]?.label,
  };
};
const Area2Code = (province: string, city: string, county: string) => {
  console.log(province, city, county);
  if (province && city && county) {
    //获取到省份的总体数据
    const res_province = regionData.filter((val) => val.label == province);
    console.log(res_province);
    //在省份里递归找到市
    const res_city = res_province[0].children.filter((val) => val.label == city);
    console.log(res_city);
    //在市里面递归找到区、县
    const res_county = res_city[0].children.filter((val) => val.label == county);

    return [res_province[0]?.value, res_city[0]?.value, res_county[0]?.value];
  }
};

export const computeArea = () => {
  return { Code2Area, Area2Code};
};

现在就可以实现h5和后管同时起作用了！

3、测试

h5选择地址后的值

const data={
birthProv:'上海市',
birthCity:'上海市-普陀区'
}

候选回显：

const birthArea=ref()
 if (data.birthCity) {
      birthArea.value = Area2Code(data.birthProv, data.birthCity.split('-')[0], data.birthCity.split('-')[1]);
    }

    <el-cascader
        @change="changeB"
        v-model="birthArea"
        :options="regionData"
        separator="-"
        placeholder="请选择"
        :props="{multiple: false}"
        clearable>
      el-cascader>

效果：

参考：
参考地址