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Fabric.js ActiveSelection opacity Property

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Fabric.js is a JavaScript library that is used to work with canvas. The canvas ActiveSelection is one of the classes 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 the opacity property to set the opacity.

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


fabric.ActiveSelection(ActiveSelection, {
    opacity : number

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

  • opacity: This parameter takes a number value.


Example: This example uses FabricJS to set the opacity 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">GeeksforGeeks</h1>
        <b> Fabric.js | ActiveSelection opacity Property </b>
    <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(), {
            opacity: 0.5,


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Last Updated : 30 Jul, 2021
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