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2.2 KiB
2.2 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 以支持也支持异步检查:示例。
en-US
Click to upload user's avatar, and validate size and format of picture with beforeUpload
.
The return value of function
beforeUpload
can be a Promise to check asynchronously. demo
import { Upload, Icon, message } from 'antd';
function getBase64(img, callback) {
const reader = new FileReader();
reader.addEventListener('load', () => callback(reader.result));
reader.readAsDataURL(img);
}
function beforeUpload(file) {
const isJPG = file.type === 'image/jpeg';
if (!isJPG) {
message.error('You can only upload JPG file!');
}
const isLt2M = file.size / 1024 / 1024 < 2;
if (!isLt2M) {
message.error('Image must smaller than 2MB!');
}
return isJPG && isLt2M;
}
class Avatar extends React.Component {
state = {
loading: false,
};
handleChange = (info) => {
if (info.file.status === 'uploading') {
this.setState({ loading: true });
return;
}
if (info.file.status === 'done') {
// Get this url from response in real world.
getBase64(info.file.originFileObj, imageUrl => this.setState({
imageUrl,
loading: false,
}));
}
}
render() {
const uploadButton = (
<div>
<Icon type={this.state.loading ? 'loading' : 'plus'} />
<div className="ant-upload-text">Upload</div>
</div>
);
const imageUrl = this.state.imageUrl;
return (
<Upload
name="avatar"
listType="picture-card"
className="avatar-uploader"
showUploadList={false}
action="//jsonplaceholder.typicode.com/posts/"
beforeUpload={beforeUpload}
onChange={this.handleChange}
>
{imageUrl ? <img src={imageUrl} alt="" /> : uploadButton}
</Upload>
);
}
}
ReactDOM.render(<Avatar />, mountNode);
.avatar-uploader > .ant-upload {
width: 128px;
height: 128px;
}