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2.5 KiB
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zh-CN
点击上传用户头像，并使用 beforeUpload 限制用户上传的图片格式和大小。
beforeUpload的返回值可以是一个 Promise 以支持异步处理，如服务端校验等：示例。
en-US
Click to upload user's avatar, and validate size and format of picture with beforeUpload.
The return value of function
beforeUploadcan be a Promise to check asynchronously. demo
import React, { useState } from 'react';
import { Upload, message } from 'antd';
import { LoadingOutlined, PlusOutlined } from '@ant-design/icons';
import type { UploadChangeParam } from 'antd/es/upload';
import type { RcFile, UploadFile, UploadProps } from 'antd/es/upload/interface';
const getBase64 = (img: RcFile, callback: (url: string) => void) => {
const reader = new FileReader();
reader.addEventListener('load', () => callback(reader.result as string));
reader.readAsDataURL(img);
};
const beforeUpload = (file: RcFile) => {
const isJpgOrPng = file.type === 'image/jpeg' || file.type === 'image/png';
if (!isJpgOrPng) {
message.error('You can only upload JPG/PNG file!');
}
const isLt2M = file.size / 1024 / 1024 < 2;
if (!isLt2M) {
message.error('Image must smaller than 2MB!');
}
return isJpgOrPng && isLt2M;
};
const App: React.FC = () => {
const [loading, setLoading] = useState(false);
const [imageUrl, setImageUrl] = useState<string>();
const handleChange: UploadProps['onChange'] = (info: UploadChangeParam<UploadFile>) => {
if (info.file.status === 'uploading') {
setLoading(true);
return;
}
if (info.file.status === 'done') {
// Get this url from response in real world.
getBase64(info.file.originFileObj as RcFile, url => {
setLoading(false);
setImageUrl(url);
});
}
};
const uploadButton = (
<div>
{loading ? <LoadingOutlined /> : <PlusOutlined />}
<div style={{ marginTop: 8 }}>Upload</div>
</div>
);
return (
<Upload
name="avatar"
listType="picture-card"
className="avatar-uploader"
showUploadList={false}
action="https://www.mocky.io/v2/5cc8019d300000980a055e76"
beforeUpload={beforeUpload}
onChange={handleChange}
>
{imageUrl ? <img src={imageUrl} alt="avatar" style={{ width: '100%' }} /> : uploadButton}
</Upload>
);
};
export default App;