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Fabric.js ActiveSelection borderOpacityWhenMoving Property

  • Last Updated : 31 Jul, 2021

Fabric.js is a JavaScript library that is used to work with canvas. The canvas ActiveSelection is one of the class of Fabric.js that is used to create ActiveSelection instances. The canvas ActiveSelection means the ActiveSelection is movable and can be stretched according to requirement.In this article we will be using borderOpacityWhenMoving property to set the opacity of the border while moving of the canvas ActiveSelection.

Approach: First import the Fabric.js library. After importing the library, create a canvas block in the body tag which will contain the ActiveSelection. After this, initialize an instance of Canvas and ActiveSelection class provided by Fabric.js and use the borderOpacityWhenMoving property to set the opacity of the border while moving.

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fabric.ActiveSelection(ActiveSelection, {
  borderOpacityWhenMoving: number

Parameters: This function takes a single parameter as mentioned above and described below:

  • borderOpacityWhenMoving: This parameter takes a number value.


Example: This example uses Fabric.js to set the borderOpacityWhenMoving property of the canvas ActiveSelection.


   <!-- FabricJS CDN -->
   <script src
   <div style="text-align: center;
               width: 400px;"> 
      <h1 style="color: green;"
         Fabric.js | ActiveSelection borderOpacityWhenMoving Property 
   <div style="text-align: center;"
      <canvas id="canvas" 
              width="500" height="500"
            style="border:1px solid green;"
   <img src
        width="100" height="100" id="my-image"
        style="display: none;">
      var canvas = new fabric.Canvas("canvas"); 
      // Getting the image 
      var img = document.getElementById('my-image'); 
      // Creating the image instance 
      var geek = new fabric.Image(img, {
      var geek = new fabric.IText('GeeksforGeeks', {
         var gfg = new fabric.ActiveSelection(
           canvas.getObjects(), {
            borderOpacityWhenMoving : 0.3


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