How To File Upload In React JS

In this article, we will see how file uploads in react js. File uploading means a user from a client machine wants to upload files to the server. We will see file uploading using react js. In this example, we will see the single file upload in react. Also, we will use Axios for image upload.

So, let's see react js file upload and how to upload a file in react js.

The process of uploading a file can be divided into two steps.

• Select a File (user input): The first step is to add the tag to our App component to enable the user to pick a file. This tag should have the type attribute set as “file”. Now, we need an event handler to listen to any changes made to the file. This event handler will be triggered whenever the user selects a new file and will update the state.
• Send a request to the server: After storing the selected file (in the state), we are now required to send it to a server. For this purpose, we can use fetch or Axios. (In this code, we use Axios a promise-based HTTP client for the browser and NodeJS). The file is sent to the service wrapped in a FormData object.

In this step, we will install Axios using the following command for react upload file.

npm install axios --save

 

 

After installing Axios, we will see an example of react file upload.

import axios from 'axios';
import React,{Component} from 'react'; 
class App extends Component { 

    state = { 
  
      // Initially, no file is selected 
      selectedFile: null
    }; 
     
    // On file select (from the pop up) 
    onFileChange = event => { 
      // Update the state 
      this.setState({ selectedFile: event.target.files[0] }); 
    }; 
     
    // On file upload (click the upload button) 
    onFileUpload = () => { 
      // Create an object of formData 
      const formData = new FormData(); 
     
      // Update the formData object 
      formData.append( 
        "myFile", 
        this.state.selectedFile, 
        this.state.selectedFile.name 
      ); 
     
      // Details of the uploaded file 
      console.log(this.state.selectedFile); 
     
      // Request made to the backend api 
      // Send formData object 
      axios.post("api/uploadfile", formData); 
    }; 
     
    // File content to be displayed after 
    // file upload is complete 
    fileData = () => { 
      if (this.state.selectedFile) { 
          
        return ( 
          <div> 
            <h2>File Details:</h2> 
            <p>File Name: {this.state.selectedFile.name}</p> 
            <p>File Type: {this.state.selectedFile.type}</p> 
            <p> 
              Last Modified:{" "} 
              {this.state.selectedFile.lastModifiedDate.toDateString()} 
            </p> 
          </div> 
        ); 
      } else { 
        return ( 
          <div> 
            <br /> 
            <h4>Choose before Pressing the Upload button</h4> 
          </div> 
        ); 
      } 
    }; 
     
    render() { 
      return ( 
        <div> 
            <h1> 
              How To File Upload In React JS - Websolutionstuff 
            </h1> 
            <div> 
                <input type="file" onChange={this.onFileChange} /> 
                <button onClick={this.onFileUpload}> 
                  Upload! 
                </button> 
            </div> 
          {this.fileData()} 
        </div> 
      ); 
    } 
  } 
  
  export default App; 

 

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