mirror of
https://github.com/ant-design/ant-design.git
synced 2024-12-13 07:39:10 +08:00
7fd093bd0a
* docs: add general components TS demo * docs: add layout components TS demo * docs: add navigation components TS demo * docs: add data entry components TS demo * chore(deps): add types for qs * docs: add data display TS demo * docs: add feedback components TS demo * docs: add other components TS demo * chore(deps): add types * docs: unified demo code style * docs: fix lint error * docs: add demo TS type * docs: fix demo TS type * test: update snapshot * docs: fix TS demo * feat: update Rate character type * docs: fix lint error * feat: update Rate character type * feat: update Rate character type
1.4 KiB
1.4 KiB
| order | title | ||||
|---|---|---|---|---|---|
| 10 |
|
zh-CN
使用 beforeUpload 转换上传的文件（例如添加水印）。
en-US
Use beforeUpload for transform file before request such as add a watermark.
import React from 'react';
import { Upload, Button } from 'antd';
import { UploadOutlined } from '@ant-design/icons';
import type { UploadProps } from 'antd';
const props: UploadProps = {
action: 'https://www.mocky.io/v2/5cc8019d300000980a055e76',
listType: 'picture',
beforeUpload(file) {
return new Promise(resolve => {
const reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = () => {
const img = document.createElement('img');
img.src = reader.result as string;
img.onload = () => {
const canvas = document.createElement('canvas');
canvas.width = img.naturalWidth;
canvas.height = img.naturalHeight;
const ctx = canvas.getContext('2d')!;
ctx.drawImage(img, 0, 0);
ctx.fillStyle = 'red';
ctx.textBaseline = 'middle';
ctx.font = '33px Arial';
ctx.fillText('Ant Design', 20, 20);
canvas.toBlob(result => resolve(result as any));
};
};
});
},
};
const App: React.FC = () => (
<Upload {...props}>
<Button icon={<UploadOutlined />}>Upload</Button>
</Upload>
);
export default App;