How to make an editor of images on JavaScript

Learn how to create an image editor with Javascript: from creating a canvas element to adding filters and transformations to your images. Example included.

Creating an Image Editor with JavaScript

Creating an image editor with JavaScript can be done by combining several different libraries and frameworks. This tutorial will provide an example of how to create a basic image editor with JavaScript and HTML5 canvas. We will be using the following libraries and frameworks: jQuery, Fabric.js, and Dropzone.js.

First, we will need to include the libraries and frameworks in our HTML file. This can be done with the following code:

<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/3.6.3/fabric.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/dropzone/5.7.2/min/dropzone.min.js"></script>

Next, we need to create a canvas element in our HTML file. This can be done with the following code:

<canvas id="canvas" width="500" height="500"></canvas>

Once the canvas element is created, we can create a new Fabric.js canvas and set it to the canvas element. This can be done with the following code:

var canvas = new fabric.Canvas('canvas');

Now that the canvas is created, we can create a Dropzone.js instance and set it to the canvas element. This can be done with the following code:

var dropzone = new Dropzone('#canvas');

The Dropzone.js instance will allow us to drag and drop images onto the canvas. To add functionality to the editor, we can add event listeners for the Dropzone.js instance. This can be done with the following code:

dropzone.on('addedfile', function(file) {
  var reader = new FileReader();

  reader.onload = function(event) {
    var img = new Image();
    img.onload = function() {
      var imgInstance = new fabric.Image(img, {
        left: 0,
        top: 0,
        angle: 0
      });

      canvas.add(imgInstance);
    };
    img.src = event.target.result;
  };

  reader.readAsDataURL(file);
});

The code above adds an event listener for when a file is added to the Dropzone.js instance. When a file is added, it reads the file as a DataURL and adds it to the canvas as a Fabric.js image instance. With this, a basic image editor has been created with JavaScript and HTML5 canvas.