Laravel 8 Drag and Drop File/Image Upload UI Using Dropzone.js Example with Progress Bars and Image Previews

  • Author: Techiediaries Team

Throughout this tutorial, we'll show you by example how to use Dropzone.js in Laravel 8 to drag, drop and upload single or multiple file with progress bars and image previews.

Dropzone.js is a JavaScript library that provides an easy way to upload and preview images with a nice progress bar. It supports multiple file uploads and drag and drop uploads. It provides features such as image previews, upload progress bars, multiple files and synchronous uploads.

Let's see how to use Dropzone.js step by step with Laravel 8 to implement multiple file and image upload with progress bars and image previews.

Step 1 — Initializing a Laravel 8 App

Let's get started by creating a new Laravel 8 application.

Head over to a new command-line interface and run the following command:

$ composer create-project --prefer-dist laravel/laravel laravel8uploadapp

Step 2 — Setting up a MySQL Database

After creating our Laravel 8 application using Composer, let's proceed to set up a database.

Open the .env file and add the credentials for accessing your database:

DB_CONNECTION=mysql 
DB_HOST=127.0.0.1  
DB_PORT=3306  
DB_DATABASE=mydb 
DB_USERNAME=root
DB_PASSWORD=root

In my case, I have already created a database named mydb in MySQL server, also make sure to change the username and password to the ones configured for your MySQL instance,

Step 3 — Adding a Laravel 8 Controller

Next, after configuring the MySQL database in your Laravel 8 application, let's add a controller for uploading files to our server.

Head back to your terminal and run the following command:

$ php artisan make:controller UploadController

Open the app/Http/Controllers/UploadController.php file and update it as follows:

<?php 

namespace  App\Http\Controllers;  
use  Illuminate\Http\Request;  

class  UploadController  extends  Controller {  

/** 
 * Generate Upload View 
 * 
 * @return void 

 */  

  public  function upload()  
  {  
      return view('upload-view');  
  }  

/** 
 * File Upload Method 
 * 
 * @return void 
 */  

  public  function uploadFile(Request $request)  
  {  
     $file = $request->file('file');  
     $fileName = time().'.'.$file->extension(); 
     $file->move(public_path('file'),$fileName);  

  return response()->json(['success'=>$fileName]);  

  }  

}

Step 4 — Adding a Laravel 8 Route

Next, let's proceed to add a route for uploading files to our server.

Head to the routes/web.php file and add following route:

use App\Http\Controllers\UploadController;

Route::get('ui', [ UploadController::class, 'upload' ]);
Route::post('upload', [ UploadController::class, 'uploadFile' ])->name('uploadFile');

Step 5 — Adding a Blade View

Finally, let's add a view template using Blade. We'll use Dropzone.js for uploading files.

The typical way of using dropzone is by creating a form element with the class dropzone:

Create the the upload-view.blade.php file inside the resources/views/folder.

Next, open the resources/views/upload-view.blade.php and update it as follows:

<!DOCTYPE html>  

<html>  
<head>  
  <title>Laravel 8 Drag And Drop File Upload </title>  

  <link  href="https://cdnjs.cloudflare.com/ajax/libs/dropzone/4.3.0/dropzone.css"  rel="stylesheet">  

  <script  src="https://cdnjs.cloudflare.com/ajax/libs/dropzone/4.3.0/dropzone.js"></script>
<script>
var dropzone = new Dropzone('#demo-upload', {
  previewTemplate: document.querySelector('#preview-template').innerHTML,
  parallelUploads: 2,
  thumbnailHeight: 120,
  thumbnailWidth: 120,
  maxFilesize: 3,
  filesizeBase: 1000,
  thumbnail: function(file, dataUrl) {
    if (file.previewElement) {
      file.previewElement.classList.remove("dz-file-preview");
      var images = file.previewElement.querySelectorAll("[data-dz-thumbnail]");
      for (var i = 0; i < images.length; i++) {
        var thumbnailElement = images[i];
        thumbnailElement.alt = file.name;
        thumbnailElement.src = dataUrl;
      }
      setTimeout(function() { file.previewElement.classList.add("dz-image-preview"); }, 1);
    }
  }

});


// Now fake the file upload, since GitHub does not handle file uploads
// and returns a 404

var minSteps = 6,
    maxSteps = 60,
    timeBetweenSteps = 100,
    bytesPerStep = 100000;

dropzone.uploadFiles = function(files) {
  var self = this;

  for (var i = 0; i < files.length; i++) {

    var file = files[i];
    totalSteps = Math.round(Math.min(maxSteps, Math.max(minSteps, file.size / bytesPerStep)));

    for (var step = 0; step < totalSteps; step++) {
      var duration = timeBetweenSteps * (step + 1);
      setTimeout(function(file, totalSteps, step) {
        return function() {
          file.upload = {
            progress: 100 * (step + 1) / totalSteps,
            total: file.size,
            bytesSent: (step + 1) * file.size / totalSteps
          };

          self.emit('uploadprogress', file, file.upload.progress, file.upload.bytesSent);
          if (file.upload.progress == 100) {
            file.status = Dropzone.SUCCESS;
            self.emit("success", file, 'success', null);
            self.emit("complete", file);
            self.processQueue();
            //document.getElementsByClassName("dz-success-mark").style.opacity = "1";
          }
        };
      }(file, totalSteps, step), duration);
    }
  }
}
</script>

<style  type="text/css">  
body {
    background: rgb(243, 244, 245);
    height: 100%;
    color: rgb(100, 108, 127);
    line-height: 1.4rem;
    font-family: Roboto, "Open Sans", sans-serif;
    font-size: 20px;
    font-weight: 300;
    text-rendering: optimizeLegibility;
}

h1 { text-align: center; }

.dropzone {
    background: white;
    border-radius: 5px;
    border: 2px dashed rgb(0, 135, 247);
    border-image: none;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}
</style>   
</head>  
<body>  

<h1>Laravel 8 DropzoneJS File Upload Demo</h1>
<section>
  <div id="dropzone">
    <form class="dropzone needsclick" id="demo-upload" action="" enctype="multipart/form-data">
    @csrf
      <div class="dz-message needsclick">    
        Drop files here or click to upload.<br>
        <span class="note needsclick">(This is just a demo dropzone. Selected 
        files are <strong>not</strong> actually uploaded.)</span>
      </div>
    </form>
  </div>
</section>  
</body>  
</html>

The code for implementing Dropzone.js is taken from this code pen:

Laravel 8 Dropzone.js Upload Example

That’s it. Dropzone will find all form elements with the class dropzone, automatically attach itself to it, and upload files dropped into it to the specified action attribute.

We have implemented our Laravel 8 file upload using Dropzone.js to drag, drop and upload single or multiple images or files with progress bars and image previews.

Step 6 — Running the Laravel 8 Server

You can run your app using the following command:

$ php artisan serve

Head over to your web browser and navigate to the localhost:8000/uploadui address.

Conclusion

In this short article, we've seen how we can create a Laravel 8 upload UI with Dropzone.js to implement a drag, drop UI for uploading single or multiple files and images with progress bars and image previews


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