How to change font-weight of a canvas-type text using Fabric.js ?

Last Updated : 04 Sep, 2021

In this article, we are going to see how to change the font-weight of a canvas-like text using FabricJS. The canvas means text written is movable and can be stretched according to requirement. Further, the text itself cannot be edited like a textbox.
Approach: To it this possible we are going to use a JavaScript library called FabricJS. After importing the library using CDN, we will create a canvas block in the body tag which will contain our text. After this, we will initialize instances of Canvas and Text provided by FabricJS and use the fontWeight property to change the font-weight and render the Canvas on the Text as given in the example below.

Syntax:

 fabric.Text(text, fontWeight: number|string);

Parameters: This function accepts two parameters as mentioned above and described below:

text: It specifies the text to be written.
fontWeight: It specifies the font-weight which can be bold, normal, 400, 500 etc.

Program: This example uses FabricJS to change font-weight of canvas-like text.

html

<!DOCTYPE html>
<html>
 
<head>
    <title>
        change font-weight of a canvas-type
        text with JavaScript
    </title>
 
    <!-- Loading the FabricJS library -->
    <script src=
"https://cdnjs.cloudflare.com/ajax/libs/fabric.js/3.6.2/fabric.min.js">
    </script>
</head>
 
<body>
    <canvas id="canvas" width="600" height="200"
        style="border:1px solid #000000;">
    </canvas>
 
    <script>
 
        // Create a new instance of Canvas
        var canvas = new fabric.Canvas("canvas");
 
        // Create a new Textbox instance
        var bold_text = new fabric.Text('GeeksforGeeks - Bold', {
            fontWeight: 'bold'
        });
 
        // Create another new Textbox instance
        var normal_text = new fabric.Text('GeeksforGeeks - Normal', {
            fontWeight: 'normal',
            top: 100
        });
 
        // Render all the Textboxes on Canvas
        canvas.add(normal_text);
        canvas.add(bold_text);
    </script>
</body>
 
</html>