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96 lines
2.4 KiB
Markdown
96 lines
2.4 KiB
Markdown
---
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order: 1
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title:
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zh-CN: 用户头像
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en-US: Avatar
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---
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## zh-CN
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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。
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> `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](https://upload-react-component.vercel.app/demo/before-upload#beforeupload)。
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## en-US
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Click to upload user's avatar, and validate size and format of picture with `beforeUpload`.
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> The return value of function `beforeUpload` can be a Promise to check asynchronously. [demo](https://upload-react-component.vercel.app/demo/before-upload#beforeupload)
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```jsx
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import { Upload, message } from 'antd';
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import { LoadingOutlined, PlusOutlined } from '@ant-design/icons';
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function getBase64(img, callback) {
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const reader = new FileReader();
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reader.addEventListener('load', () => callback(reader.result));
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reader.readAsDataURL(img);
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}
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function beforeUpload(file) {
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const isJpgOrPng = file.type === 'image/jpeg' || file.type === 'image/png';
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if (!isJpgOrPng) {
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message.error('You can only upload JPG/PNG file!');
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}
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const isLt2M = file.size / 1024 / 1024 < 2;
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if (!isLt2M) {
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message.error('Image must smaller than 2MB!');
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}
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return isJpgOrPng && isLt2M;
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}
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class Avatar extends React.Component {
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state = {
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loading: false,
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};
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handleChange = info => {
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if (info.file.status === 'uploading') {
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this.setState({ loading: true });
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return;
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}
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if (info.file.status === 'done') {
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// Get this url from response in real world.
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getBase64(info.file.originFileObj, imageUrl =>
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this.setState({
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imageUrl,
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loading: false,
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}),
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);
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}
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};
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render() {
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const { loading, imageUrl } = this.state;
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const uploadButton = (
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<div>
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{loading ? <LoadingOutlined /> : <PlusOutlined />}
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<div style={{ marginTop: 8 }}>Upload</div>
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</div>
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);
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return (
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<Upload
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name="avatar"
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listType="picture-card"
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className="avatar-uploader"
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showUploadList={false}
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action="https://www.mocky.io/v2/5cc8019d300000980a055e76"
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beforeUpload={beforeUpload}
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onChange={this.handleChange}
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>
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{imageUrl ? <img src={imageUrl} alt="avatar" style={{ width: '100%' }} /> : uploadButton}
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</Upload>
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);
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}
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}
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ReactDOM.render(<Avatar />, mountNode);
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```
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```css
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.avatar-uploader > .ant-upload {
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width: 128px;
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height: 128px;
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}
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```
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