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

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---
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order: 3
title:
zh-CN: 移入展开
en-US: Hover
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---
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## zh-CN
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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.
```tsx
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import { Cascader } from 'antd';
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import React from 'react';
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interface Option {
value: string;
label: string;
children?: Option[];
}
const options: Option[] = [
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{
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',
},
],
},
],
},
];
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const onChange = (value: string[]) => {
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console.log(value);
};
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// Just show the latest item.
const displayRender = (labels: string[]) => labels[labels.length - 1];
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const App: React.FC = () => (
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<Cascader
options={options}
expandTrigger="hover"
displayRender={displayRender}
onChange={onChange}
/>
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);
export default App;
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```