File uploading in React.js (2024)

File uploading in React.js (1)

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React JSWeb DevelopmentFront End Technology

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File transmission represents a vital aspect of any online platform, permitting users to effortlessly transfer and disseminate files among each other. With the proliferation of JavaScript libraries and frameworks, file uploading has become significantly easier, with React.js being no exception. In this treatise, we shall delve into the intricacies of file uploading in React.js, exploring the algorithmic approach, various methodologies, and functional illustrations.

Algorithm

At the crux of it, the act of file uploading in React.js entails transmitting a document from the user's machine to the host server. This is achieved by employing a form that comprises an input element designated as "file." Upon the user's selection of a file, it is then dispatched to the server where it undergoes processing before being securely stored.

The procedure of file uploading in React.js can be divided into several phases −

  • The user chooses a file to upload

  • The file is transmitted to the server

  • The server performs the necessary handling and archives the file

  • The user is notified of the successful completion of the upload.

Approaches to File Uploading in React.js

There are two main approaches to file uploading in React.js: using JavaScript and using React-Dropzone.

Method 1: Using JavaScript

The first approach to file uploading in React.js is to use JavaScript. This involves creating a form with an input field of type "file" and then using JavaScript to handle the file upload process.

Example

Here is an example of how to implement file uploading using JavaScript in React.js −

class FileUpload extends React.Component { constructor(props) { super(props); this.state = { selectedFile: null }; } onChangeHandler = event => { this.setState({ selectedFile: event.target.files[0] }); }; onClickHandler = () => { const data = new FormData(); data.append("file", this.state.selectedFile); axios .post("/api/upload", data) .then(res => { console.log(res.statusText); }) .catch(err => { console.log(err); }); }; render return ( <div> <input type="file" onChange={this.onChangeHandler} /> <button onClick={this.onClickHandler}>Upload</button> </div> );}

In this illustration, a form that features an input element of type "file" is constructed. Upon the user's selection of a file, the onChangeHandler function is activated, which assigns the selectedFile state to the selected document. The onClickHandler function is then executed once the user clicks the "Upload" button, transmitting the file to the server through the utilization of the axios library.

Method 2: Using React-Dropzone

The second approach to file uploading in React.js is to use the React-Dropzone library. This library provides a simple, easy-to-use solution for file uploading in React.js.

Example

Here is an example of how to implement file uploading using React-Dropzone −

import React, { useState } from "react";import { useDropzone } from "react-dropzone";function MyDropzone() { const [files, setFiles] = useState([]); const { getRootProps, getInputProps } = useDropzone({ accept: "image/*", onDrop: acceptedFiles => { setFiles(acceptedFiles.map(file => Object.assign(file, { preview: URL.createObjectURL(file) }))); } }); const thumbs = files.map(file => ( <div key={file.name}> <img src={file.preview} alt={file.name} style={{ width: "100px", height: "100px" }} /> </div> )); return ( <section className="container"> <div {...getRootProps({ className: "dropzone" })}> <input {...getInputProps()} /> <p>Drag 'n' drop some files here, or click to select files</p> </div> <aside> {thumbs} </aside> </section> );}

In this instance, the useDropzone hook from the React-Dropzone library is utilized to manage the file uploading process. The hook offers the getRootProps and getInputProps functions, which are utilized to define the form and input element respectively. Upon the user's deposition of a file into the designated dropzone, the onDrop function is activated, which assigns the files state to the accepted files.

Example 1: Simple file Upload

Here is a simple example of file uploading in React.js.

In this example, a simple file upload form is created using an input field of type "file." When the user selects a file, the onChangeHandler function is triggered, which sets the selectedFile state to the selected file. If a file is selected, the file name and size are displayed, otherwise, a message is displayed indicating that no file has been selected.

import React, { useState } from "react";const SingleFileUpload = () => { const [selectedFile, setSelectedFile] = useState(null); const handleFileChange = (e) => { setSelectedFile(e.target.files[0]); }; const handleUpload = async () => { if (!selectedFile) { alert("Please first select a file"); return; } const formData = new FormData(); formData.append("file", selectedFile); try { // Replace this URL with your server-side endpoint for handling file uploads const response = await fetch("https://your-upload-endpoint.com/upload", { method: "POST", body: formData }); if (response.ok) { alert("File upload is successfully"); } else { alert("Failed to upload the file due to errors"); } } catch (error) { console.error("Error while uploading the file:", error); alert("Error occurred while uploading the file"); } }; return ( <div> <h2>Single File Upload</h2> <input type="file" onChange={handleFileChange} /> <button onClick={handleUpload}>Upload</button> </div> );};export default SingleFileUpload;

Output

File uploading in React.js (30)

Example 2: Multiple file Upload

Here is an example of multiple file upload in React.js.

In this example, a form for multiple file upload is created using an input field of type "file" with the multiple attribute. When the user selects files, the onChangeHandler function is triggered, which sets the selectedFiles state to the selected files. If files are selected, the names and sizes of the selected files are displayed in a list, otherwise, a message is displayed indicating that no files have been selected.

import React, { useState } from 'react';const MultipleFileUpload = () => { const [selectedFiles, setSelectedFiles] = useState([]); const handleFileChange = (e) => { setSelectedFiles([...e.target.files]); }; const handleUpload = async () => { if (selectedFiles.length === 0) { alert('Please select files first'); return; } const formData = new FormData(); selectedFiles.forEach((file) => { formData.append('files', file); }); try { // Replace this URL with your server-side endpoint for handling file uploads const response = await fetch('https://your-upload-endpoint.com/upload', { method: 'POST', body: formData, }); if (response.ok) { alert('Files uploaded successfully'); } else { alert('Failed to upload the files'); } } catch (error) { console.error('Error while uploading the files:', error); alert('Error occurred while uploading the files'); } }; return ( <div> <h2>Multiple File Upload</h2> <input type="file" multiple onChange={handleFileChange} /> <button onClick={handleUpload}>Upload</button> </div> );};export default MultipleFileUpload;

Output

File uploading in React.js (31)

Conclusion

In conclusion, file uploading is a crucial component of any web application, and React.js provides several options for implementing it. Whether you choose to use JavaScript or the React-Dropzone library, the process of file uploading in React.js is relatively straightforward. By following the examples in this article, you should have a good understanding of how to implement file uploading in React.js and be able to create your own file upload form.

Nikesh Jagsish Malik

Updated on: 17-Apr-2023

9K+ Views

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File uploading in React.js (2024)

FAQs

How to handle file upload in JS? ›

How to upload files using JavaScript
  1. Accessing files with HTML.
  2. Uploading files using Fetch API.
  3. Uploading files using XMLHttpRequest.
  4. Filtering for a particular file type.
  5. File size validation.
  6. Tracking file upload progress.
  7. File upload progress bar.
  8. Getting information about uploaded files.
Aug 21, 2024

How do I read the content of an uploaded file in react JS? ›

To fetch the file data, use the Async library to launch the File Reader API from React. Assign a new FileReader() object to a variable, then use an onload function to grab the file information from an array of selected files or e. target.

How do I upload large files to Reactjs? ›

Uploading large files, especially those spanning multiple gigabytes, from a React application can be a challenging task, both in terms of performance and security. A common approach involves using Amazon S3 pre-signed URLs, provided by a backend service.

How to handle file uploading? ›

In short, the following principles should be followed to reach a secure file upload implementation:
  1. List allowed extensions. ...
  2. Validate the file type, don't trust the Content-Type header as it can be spoofed.
  3. Change the filename to something generated by the application.
  4. Set a filename length limit. ...
  5. Set a file size limit.

How to upload a PDF file in ReactJS? ›

To upload a PDF file in React, you can create a file input element and handle the file upload in React component using state. Then, you can send the selected file to your server or API for processing, or you can display the PDF in the browser by using a third-party library like react-pdf.

How to upload multiple files in JS? ›

Uploading Multiple Files Using JavaScript
  1. Step 1: Create an HTML form with a file input element that allows Multiple file selections. ...
  2. Step 2: Add an event listener to capture file selection. ...
  3. Step 3: Use FormData to Store Files. ...
  4. Step 4: Send the AJAX request using XMLHttpRequest.
Oct 4, 2023

How to do file handling in js? ›

If the file does not exist, a new file, containing the specified content, will be created:
  1. Create a new file using the writeFile() method: var fs = require('fs'); ...
  2. Replace the content of the file "mynewfile3.txt": var fs = require('fs'); ...
  3. Delete "mynewfile2.txt": ...
  4. Rename "mynewfile1.txt" to "myrenamedfile.txt":

How to upload a file through API? ›

Basic Concepts of File Upload in APIs
  1. Content-Type. ...
  2. HTTP Method. ...
  3. File Encoding. ...
  4. File Size Limits. ...
  5. Step 1: Creating a New Project. ...
  6. Step 2: Select the Request Method. ...
  7. Step 3: Set the Request Body Content Type. ...
  8. Step 4: Add a File Field to the Request Body.
Apr 29, 2024

How to display file content in React JS? ›

Display Files in the Document Viewer - ReactJS
  1. Required Knowledge. ...
  2. Get Started. ...
  3. Create the Project and Add LEADTOOLS References. ...
  4. Set the License File. ...
  5. Import LEADTOOLS Dependencies. ...
  6. Add the Document Viewer Code. ...
  7. Improve the Visuals of the Project. ...
  8. Run the Document Service.

How to handle multiple file upload in React? ›

Steps to multiple file upload using React
  1. Create multiple files upload React component and render to the UI.
  2. Bind UI controls with the JS handlers to access files and trigger the upload.
  3. Acknowledge users with a progress bar and previews.

How do I check the size of a file before uploading in React? ›

By using the uploading event, you can get the file size before uploading it to the server. File object contains the file size in bytes only. You can convert the size to standard formats ( KB or MB ) using bytesToSize method.

How to upload files in ReactJS? ›

How to upload files with Reactjs
  1. To begin, use the command to create a React project: create-react-app my-app npx.
  2. In the src directory, add a new component called UploadFile. ...
  3. Create a file input element in the UploadFile component and add a onChange event to manage the user's file selection.
Aug 14, 2023

How do I load large data in ReactJS? ›

Using React Virtualised Libraries

Several popular libraries, such as `react-window` and `react-virtualized`, can simplify the process. These libraries provide components like `List`, `Grid`, and `Table`, which utilise virtual rendering techniques to efficiently handle large datasets.

Is ReactJS good for large applications? ›

React's component-based architecture, similar to Angular, promotes modularity and reusability, simplifying the process of building and maintaining large applications. The vast ecosystem of third-party libraries and tools available for React developers further enhances the flexibility and capabilities of the library.

How to upload a file using Fetch in React? ›

Uploading a single file in React with fetch. Firstly, we will create a boilerplate app that we'll use to add the file upload markup and logic. We will use Vite and TypeScript. Do not forget to install the deps as the scaffolding command described above tells you in the output.

How do I submit data in ReactJS? ›

To submit the form data and redirect to another page in React, you'll need to do the following:
  1. Wrap your form inside a form tag.
  2. Add an onSubmit event handler to your form that prevents the default form submission behavior.
  3. Use the useState hook to keep track of the form data.

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