ant-design/components/select/demo/coordinate.md

---
order: 7
title:
  zh-CN: 联动
  en-US: coordinate
---

## zh-CN

省市联动是典型的例子。

推荐使用 [Cascader](/components/cascader/) 组件。

## en-US

Coordinating the selection of provinces and cities is a common use case and demonstrates how selection can be coordinated.

Using the [Cascader](/components/cascader) component is strongly recommended instead as it is more flexible and capable.

```tsx
import React, { useState } from 'react';
import { Select } from 'antd';

const { Option } = Select;
const provinceData = ['Zhejiang', 'Jiangsu'];
const cityData = {
  Zhejiang: ['Hangzhou', 'Ningbo', 'Wenzhou'],
  Jiangsu: ['Nanjing', 'Suzhou', 'Zhenjiang'],
};

type CityName = keyof typeof cityData;

const App: React.FC = () => {
  const [cities, setCities] = useState(cityData[provinceData[0] as CityName]);
  const [secondCity, setSecondCity] = useState(cityData[provinceData[0] as CityName][0]);

  const handleProvinceChange = (value: CityName) => {
    setCities(cityData[value]);
    setSecondCity(cityData[value][0]);
  };

  const onSecondCityChange = (value: CityName) => {
    setSecondCity(value);
  };

  return (
    <>
      <Select defaultValue={provinceData[0]} style={{ width: 120 }} onChange={handleProvinceChange}>
        {provinceData.map(province => (
          <Option key={province}>{province}</Option>
        ))}
      </Select>
      <Select style={{ width: 120 }} value={secondCity} onChange={onSecondCityChange}>
        {cities.map(city => (
          <Option key={city}>{city}</Option>
        ))}
      </Select>
    </>
  );
};

export default App;
```