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[[English Template / 英文模板](https://github.com/ant-design/ant-design/blob/master/.github/PULL_REQUEST_TEMPLATE.md)] ### 🤔 这个变动的性质是? - [ ] 新特性提交 - [ ] 日常 bug 修复 - [ ] 站点、文档改进 - [x] 演示代码改进 - [ ] 组件样式/交互改进 - [ ] TypeScript 定义更新 - [ ] 包体积优化 - [ ] 性能优化 - [ ] 功能增强 - [ ] 国际化改进 - [ ] 重构 - [ ] 代码风格优化 - [ ] 测试用例 - [ ] 分支合并 - [ ] 其他改动(是关于什么的改动?) ### 🔗 相关 Issue 无 ### 💡 需求背景和解决方案 无 ### 📝 更新日志 | 语言 | 更新描述 | | ------- | -------- | | 🇺🇸 英文 | | | 🇨🇳 中文 | | ### ☑️ 请求合并前的自查清单 ⚠️ 请自检并全部**勾选全部选项**。⚠️ - [x] 文档已补充或无须补充 - [x] 代码演示已提供或无须提供 - [x] TypeScript 定义已补充或无须补充 - [x] Changelog 已提供或无须提供
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zh-CN
beforeUpload
返回 false
或 Promise.reject
时,只用于拦截上传行为,不会阻止文件进入上传列表(原因)。如果需要阻止列表展现,可以通过返回 Upload.LIST_IGNORE
实现。
en-US
beforeUpload
only prevent upload behavior when return false or reject promise, the prevented file would still show in file list. Here is the example you can keep prevented files out of list by return UPLOAD.LIST_IGNORE
.
import React, { useState } from 'react';
import { Upload, Button, message } from 'antd';
import { UploadOutlined } from '@ant-design/icons';
const Uploader = () => {
const props = {
beforeUpload: file => {
const isPNG = file.type === 'image/png';
if (!isPNG) {
message.error(`${file.name} is not a png file`);
}
return isPNG || Upload.LIST_IGNORE;
},
onChange: info => {
console.log(info.fileList);
},
};
return (
<Upload {...props}>
<Button icon={<UploadOutlined />}>Upload png only</Button>
</Upload>
);
};
ReactDOM.render(<Uploader />, mountNode);