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Fabric.js ActiveSelection subTargetCheck Property

  • Last Updated : 25 May, 2021

Fabric.js is a JavaScript library that is used 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 subTargetCheck property.

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 subTargetCheck property.

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fabric.ActiveSelection(ActiveSelection, {
    subTargetCheck : boolean

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

  • subTargetCheck : This parameter takes a boolean value.

Example: This example uses FabricJS to set the subTargetCheck property of the canvas ActiveSelection as shown in the below example:


<!DOCTYPE html>
    <!-- FabricJS CDN -->
    <script src=
    <div style="text-align: center;width: 400px;">
      <h1 style="color: green;">
          Fabric.js | ActiveSelection 
          subTargetCheck 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");
      // Initiate a Rect instance  
      var rectangle = new fabric.Rect({
          width: 200,
          height: 100,
      var geek = new fabric.IText('GeeksforGeeks', {
      var gfg = new fabric.ActiveSelection(canvas.getObjects(), {


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