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

order	title
3	[{zh-CN 移入展开} {en-US Hover}]

zh-CN

通过移入展开下级菜单，点击完成选择。

en-US

Hover to expand sub menu, click to select option.

import { Cascader } 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',
    }],
  }],
}];

function onChange(value) {
  console.log(value);
}

// Just show the latest item.
function displayRender(label) {
  return label[label.length - 1];
}

ReactDOM.render(
  <Cascader options={options} expandTrigger="hover"
    displayRender={displayRender} onChange={onChange}
  />
, mountNode);