react antd upload 选择文件时只能看到图片格式的文件
时间: 2023-11-06 17:05:44 浏览: 161
在antd的Upload组件中,默认情况下只会显示图片类型的文件,如果您需要选择其他类型的文件,可以通过设置"accept"属性来实现。例如,如果您需要选择.xlsx类型的文件,可以这样写:
```jsx
<Upload accept=".xlsx" >
<Button icon={<UploadOutlined />}>Click to Upload</Button>
</Upload>
```
这样设置后,选择文件对话框中就只会显示.xlsx类型的文件了。如果您希望同时支持多种类型的文件,可以使用逗号分隔符分隔多个文件类型,例如:
```jsx
<Upload accept=".xlsx,.doc,.pdf" >
<Button icon={<UploadOutlined />}>Click to Upload</Button>
</Upload>
```
这样设置后,选择文件对话框中就会显示.xlsx、.doc和.pdf类型的文件了。
相关问题
antd upload上传图片
好的,您可以按照以下步骤来实现antd upload上传图片:
1. 首先安装antd和axios。
```bash
npm install antd axios --save
```
2. 在您的组件中引入antd upload组件。
```javascript
import { Upload, message } from 'antd';
import { LoadingOutlined, PlusOutlined } from '@ant-design/icons';
class UploadImage extends React.Component {
state = {
loading: false,
imageUrl: '',
};
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 { loading, imageUrl } = this.state;
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={this.handleChange}
>
{imageUrl ? <img src={imageUrl} alt="avatar" style={{ width: '100%' }} /> : uploadButton}
</Upload>
);
}
}
```
3. 在handleChange方法中,您需要将上传的图片转换为base64格式,以便于后续的保存和显示。
```javascript
import { Upload, message } from 'antd';
import { LoadingOutlined, PlusOutlined } from '@ant-design/icons';
function getBase64(file) {
return new Promise((resolve, reject) => {
const reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = () => resolve(reader.result);
reader.onerror = error => reject(error);
});
}
class UploadImage extends React.Component {
state = {
loading: false,
imageUrl: '',
};
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 { loading, imageUrl } = this.state;
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={this.handleChange}
>
{imageUrl ? <img src={imageUrl} alt="avatar" style={{ width: '100%' }} /> : uploadButton}
</Upload>
);
}
}
```
4. 最后,在handleSubmit方法中,您可以将base64格式的图片传给后端进行保存。
```javascript
import { Upload, message } from 'antd';
import { LoadingOutlined, PlusOutlined } from '@ant-design/icons';
import axios from 'axios';
function getBase64(file) {
return new Promise((resolve, reject) => {
const reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = () => resolve(reader.result);
reader.onerror = error => reject(error);
});
}
class UploadImage extends React.Component {
state = {
loading: false,
imageUrl: '',
};
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,
}),
);
}
};
handleSubmit = () => {
axios.post('/api/upload', {
image: this.state.imageUrl,
}).then(response => {
message.success('Image uploaded successfully!');
}).catch(error => {
message.error('Failed to upload image!');
});
};
render() {
const { loading, imageUrl } = this.state;
const uploadButton = (
<div>
{loading ? <LoadingOutlined /> : <PlusOutlined />}
<div style={{ marginTop: 8 }}>Upload</div>
</div>
);
return (
<div>
<Upload
name="avatar"
listType="picture-card"
className="avatar-uploader"
showUploadList={false}
action="https://www.mocky.io/v2/5cc8019d300000980a055e76"
beforeUpload={beforeUpload}
onChange={this.handleChange}
>
{imageUrl ? <img src={imageUrl} alt="avatar" style={{ width: '100%' }} /> : uploadButton}
</Upload>
<Button type="primary" onClick={this.handleSubmit}>Submit</Button>
</div>
);
}
}
```
以上就是antd upload上传图片的实现步骤。
antd 表单上传文件校验
### 使用 Ant Design 实现表单中的文件上传及校验
在构建基于 Ant Design 的 Web 应用程序时,处理文件上传并对其进行验证是一个常见的需求。为了满足这一功能,在 Ant Design 中提供了 `Upload` 组件用于文件的选择与提交,并且能够结合 `Form.Item` 来设置相应的规则来进行必要的校验。
#### 创建带有文件上传字段的表单项
下面展示了一个简单的例子,说明如何创建一个支持图片类型的文件上传控件,并对其添加基本的校验逻辑:
```jsx
import React from 'react';
import { Form, Upload, message } from 'antd';
import { InboxOutlined } from '@ant-design/icons';
const formItemLayout = {
labelCol: { span: 6 },
wrapperCol: { span: 18 }
};
// 自定义校验函数
function checkFile(rule, value, callback) {
const fileLimitSizeMB = 2;
let isValidType = false;
if (!value || !value.fileList.length) {
return Promise.reject(new Error('请选择要上传的文件'));
}
// 检查文件大小不超过指定限制
for (let i = 0; i < value.fileList.length; ++i) {
if (value.fileList[i].size / 1024 / 1024 > fileLimitSizeMB) {
return Promise.reject(
new Error(`文件大小不得超过 ${fileLimitSizeMB} MB`)
);
}
// 只允许特定格式的文件
if (
['image/jpeg', 'image/png'].indexOf(value.fileList[i].type) !== -1
) {
isValidType = true;
}
}
if (!isValidType) {
return Promise.reject(new Error('仅限于 JPEG 或 PNG 图片格式'));
}
return Promise.resolve();
}
class FileUploadDemo extends React.Component {
render() {
return (
<Form {...formItemLayout}>
<Form.Item name="upload" rules={[{ validator: checkFile }]}>
<Upload.Dragger>
<p className="ant-upload-drag-icon">
<InboxOutlined />
</p>
<p className="ant-upload-text">点击或将文件拖拽到这里</p>
<p className="ant-upload-hint">
支持JPEG/PNG格式,最大${fileLimitSizeMB}M.
</p>
</Upload.Dragger>
</Form.Item>
{/* 提交按钮 */}
<Form.Item wrapperCol={{ offset: 6 }}>
<Button type="primary" htmlType="submit">
提交
</Button>
</Form.Item>
</Form>
);
}
}
```
此代码片段展示了如何利用 `Upload.Dragger` 构建可拖放区域让用户选择文件[^1]。同时设置了自定义校验器 `checkFile()` 函数来确保所选文件符合预期条件——即只接受一定尺寸范围内的 JPG/JPEG 和 PNG 格式的图像文件[^4]。
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