ant-design/components/cascader/demo/placement.md

order	title
13	zh-CN en-US 弹出位置 Placement

zh-CN

可以通过 placement 手动指定弹出的位置。

en-US

You can manually specify the position of the popup via placement.

import { Cascader, Radio } from 'antd';

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

const SetPlacementDemo = () => {
  const [placement, SetPlacement] = React.useState('topLeft');

  const placementChange = e => {
    SetPlacement(e.target.value);
  };

  return (
    <>
      <Radio.Group value={placement} onChange={placementChange}>
        <Radio.Button value="topLeft">topLeft</Radio.Button>
        <Radio.Button value="topRight">topRight</Radio.Button>
        <Radio.Button value="bottomLeft">bottomLeft</Radio.Button>
        <Radio.Button value="bottomRight">bottomRight</Radio.Button>
      </Radio.Group>
      <br />
      <br />
      <Cascader options={options} placeholder="Please select" placement={placement} />
    </>
  );
};

ReactDOM.render(<SetPlacementDemo />, mountNode);