How to set the style of controlling corners of Textbox using FabricJS?

In this tutorial, we are going to learn how to set the style of controlling corners of Textbox using FabricJS. We can customize, stretch or move around the text written in a textbox. In order to create a textbox, we will have to create an instance of fabric.Textbox class and add it to the canvas. The controlling corners of an object allow us to scale, stretch or change its position. We can customize our controlling corners in many ways such as adding a specific colour to it, changing its size, etc. We can change the style by using the cornerStyle property.

Syntax

new fabric.Textbox(text: String, { cornerStyle: String }: Object)

Parameters

text − This parameter accepts a String which is the text string that we want to display inside our textbox.
options (optional) − This parameter is an Object which provides additional customizations to our textbox. Using this parameter, properties such as colour, cursor, stroke width and a lot of other properties can be changed related to the object of which cornerStyle is a property.

Options Keys

cornerStyle − This property accepts a String which allows us to specify the style of controlling corners that we want.

Example 1

Default style of controlling corners

Let’s see a code example that shows the default style of controlling corners.


<!DOCTYPE html>
<html>
<head>
	<!-- Adding the Fabric JS Library-->
	<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script>
</head>
<body>
	<h2>Default style of controlling corners</h2>
	<p>You can select the textbox to see the default style of controlling corners</p>
	<canvas id="canvas"></canvas>
	<script>
		// Initiate a canvas instance
		var canvas = new fabric.Canvas("canvas");
		canvas.setWidth(document.body.scrollWidth);
		canvas.setHeight(250);
		
		// Initiate a textbox object
		var textbox = new fabric.Textbox("People are taking the comedians seriously and the politicians as a joke.", {
			backgroundColor: "rgba(204,255,0,0.2)",
			width: 400,
			top: 70,
			left: 110,
			cornerColor: "#87a96b",
		});
		
		// Add it to the canvas
		canvas.add(textbox);
	</script>
</body>
</html>

Example 2

Passing cornerStyle as key with the value "circle"

We can specify the style or appearance of the controlling corners of an actively selected object by passing the values as “circle” or “rect”. Passing the value as “circle” will make the controlling corners appear circular, as we have done in the example below −


<!DOCTYPE html>
<html>
<head>
	<!-- Adding the Fabric JS Library-->
	<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script>
</head>
<body>
	<h2>Passing cornerStyle as key with the value "circle"</h2>
	<p>You can select the textbox to see that the corner style has changed to circle</p>
	<canvas id="canvas"></canvas>
	<script>
		// Initiate a canvas instance
		var canvas = new fabric.Canvas("canvas");
		canvas.setWidth(document.body.scrollWidth);
		canvas.setHeight(250);
		
		// Initiate a textbox object
		var textbox = new fabric.Textbox("People are taking the comedians seriously and the politicians as a joke.", {
			backgroundColor: "rgba(204,255,0,0.2)",
			width: 200,
			top: 70,
			left: 110,
			cornerColor: "#87a96b",
			cornerStyle: "circle",
		});
		
		// Add it to the canvas
		canvas.add(textbox);
	</script>
</body>
</html>