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* docs: more about useWatch * test: Update test case * docs: more info * docs: more & more * feat: add useFormInstance * chore: add version info
45 lines
1.0 KiB
Markdown
45 lines
1.0 KiB
Markdown
---
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order: 3.3
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version: 4.20.0
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title:
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zh-CN: 字段监听 Hooks
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en-US: Watch Hooks
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---
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## zh-CN
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`useWatch` 允许你监听字段变化，同时仅当改字段变化时重新渲染。API 文档请[查阅此处](#Form.useWatch)。
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## en-US
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`useWatch` helps watch the field change and only re-render for the value change. [API Ref](#Form.useWatch).
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```tsx
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import React from 'react';
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import { Form, Input, InputNumber, Typography } from 'antd';
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const Demo = () => {
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const [form] = Form.useForm<{ user: { name: string; age: number } }>();
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const nameValue = Form.useWatch('name', form);
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return (
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<>
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<Form form={form} layout="vertical" autoComplete="off">
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<Form.Item name="name" label="Name (Watch to trigger rerender)">
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<Input />
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</Form.Item>
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<Form.Item name="age" label="Age (Not Watch)">
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<InputNumber />
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</Form.Item>
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</Form>
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<Typography>
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<pre>Name Value: {nameValue}</pre>
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</Typography>
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</>
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);
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};
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export default Demo;
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```
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