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File Upload trong ReactJS - Freetuts
REACTJS EXAMPLE
CÁC CHỦ ĐỀ
BÀI MỚI NHẤT
File Upload trong ReactJS
Trong bài tập này, mình sẽ tạo một tính năng cho phép người dùng tải lên một tệp tin và gửi yêu cầu POST tới API để lưu trữ file trên máy chủ.
Mình sẽ tiếp tục phát triển ứng dụng của mình bằng cách thêm một tính năng cho phép tải lên file.
Bước 1: Tạo Component FileUpload
Trong component FileUpload
, mình sẽ tạo một giao diện cho phép người dùng chọn file và gửi yêu cầu POST tới API để tải lên file.
// src/components/FileUpload.js
import React, { useState } from 'react';
import axios from 'axios';
const FileUpload = () => {
const [file, setFile] = useState(null);
const [error, setError] = useState(null);
const [successMessage, setSuccessMessage] = useState(null);
const handleFileChange = e => {
setFile(e.target.files[0]);
};
const handleSubmit = async e => {
e.preventDefault();
try {
const formData = new FormData();
formData.append('file', file);
await axios.post('https://example.com/api/upload', formData, {
headers: {
'Content-Type': 'multipart/form-data',
},
});
setSuccessMessage('File uploaded successfully!');
} catch (error) {
console.error('Error uploading file:', error);
setError('Failed to upload file. Please try again.');
}
};
return (
<div>
<h2>File Upload</h2>
{error && <div>Error: {error}</div>}
{successMessage && <div>{successMessage}</div>}
<form onSubmit={handleSubmit}>
<input type="file" onChange={handleFileChange} />
<button type="submit">Upload</button>
</form>
</div>
);
};
export default FileUpload;
Bước 2: Import và sử dụng Component FileUpload
Import component FileUpload
vào trong App.js và sử dụng nó trong ứng dụng của bạn.
// src/App.js
import React from 'react';
import FileUpload from './components/FileUpload';
import './App.css';
function App() {
return (
<div className="App">
<FileUpload />
</div>
);
}
export default App;
Kết quả:
Khi người dùng chọn file và nhấn nút "Upload", file sẽ được tải lên máy chủ thông qua một yêu cầu POST tới API. Sau khi tải lên thành công, file sẽ được lưu trữ trên máy chủ và có sẵn để sử dụng.
Kết bài
Trong bài tập này, mình đã tạo một tính năng cho phép người dùng tải lên một file và gửi yêu cầu POST tới API để lưu trữ file trên máy chủ. Điều này cung cấp cho người dùng khả năng tương tác với dữ liệu file và mở rộng tính năng của ứng dụng.
Bài giải
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Câu hỏi thường gặp liên quan:
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