Fabric.js Textbox fontSize Property

Last Updated : 19 Jan, 2021

In this article, we are going to see how to change the font size of a Textbox canvas using FabricJS. The Textbox canvas means Textbox written is movable and can be stretched according to requirement.

Approach: To make it 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 Textbox. After this, we will initialize instances of Canvas and Textbox provided by FabricJS and use the fontSize property to change the font size and render the Canvas on the Textbox as given in the below example.

Syntax:

fabric.Textbox('text', {
    fontSize: number
});

Parameters: This function accepts one parameter as mentioned above and described below:

fontSize: It specifies the font size.

Example: This example uses FabricJS to change font size of the textbox canvas.

HTML

<!DOCTYPE html> 
<html> 
  
<head> 
    <!-- Adding the FabricJS library -->
    <script src= 
"https://cdnjs.cloudflare.com/ajax/libs/fabric.js/3.6.2/fabric.min.js"> 
    </script> 
</head> 
  
<body> 
  <h1 style="color: green;"> 
      GeeksforGeeks 
  </h1> 
  
  <h3> 
      Fabric.js | Textbox fontSize Property 
  </h3> 
  
  <canvas id="canvas" width="600" height="300" 
      style="border:1px solid #000000"> 
  </canvas> 
  
  <script> 
  
      // Initiate a Canvas instance  
      var canvas = new fabric.Canvas("canvas"); 
  
      // Create a new Textbox instance  
      var text = new fabric.Textbox( 
          'A Computer Science Portal', { 
          width: 500, 
          fontSize: 90 
      }); 
  
      // Render the Textbox in canvas  
      canvas.add(text); 
      canvas.centerObject(text); 
  </script> 
</body> 
  
</html>