ant-design/components/cascader/demo/change-on-select.tsx

import React from 'react';
import { Cascader } from 'antd';
import type { SingleCascaderProps } from 'antd/es/cascader';

interface Option {
  value: string;
  label: string;
  children?: Option[];
}

const options: Option[] = [
  {
    value: 'zhejiang',
    label: 'Zhejiang',
    children: [
      {
        value: 'hangzhou',
        label: 'Hanzhou',
        children: [
          {
            value: 'xihu',
            label: 'West Lake',
          },
        ],
      },
    ],
  },
  {
    value: 'jiangsu',
    label: 'Jiangsu',
    children: [
      {
        value: 'nanjing',
        label: 'Nanjing',
        children: [
          {
            value: 'zhonghuamen',
            label: 'Zhong Hua Men',
          },
        ],
      },
    ],
  },
];

const onChange: SingleCascaderProps<Option>['onChange'] = (value) => {
  console.log(value);
};

const App: React.FC = () => <Cascader options={options} onChange={onChange} changeOnSelect />;

export default App;