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

In this tutorial, we are going to set the colour of the controlling corners of Textbox using FabricJS. We can customize, stretch or move around the text written in a textbox. We can also customize the text itself by using properties like fontSize, fontFamily, fontStyle, fontWeight etc. In order to create a textbox, we will have to create an instance of fabric.Textbox class and add it to the canvas. The cornerColor property allows us to manipulate the colour of the controlling corners when the object is active.

Syntax

new fabric.Textbox(text: String, { cornerColor: 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 the cornerColor is a property.

Options Keys

cornerColor: This property accepts a String which allows us to assign a color to the controlling corners when the object is actively selected. The default value is rgb(178,204,255).

Example 1

Passing cornerColor as key with a color name as value

Let’s see a code example to change the colour by using the cornerColor property. In this case we have assigned the value “orange” to the key which thus makes the controlling corners appear orange.


<!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 cornerColor as key with a color name as value</h2>
	<p>You can select the textbox to see that the corner colour is orange</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("A little progress each day adds up to big results.", {
			backgroundColor: "#ffe5b4",
			width: 400,
			top: 70,
			left: 110,
			cornerColor: "orange",
		});
		
		// Add it to the canvas
		canvas.add(textbox);
	</script>
</body>
</html>

Example 2

Assigning an RGBA value to the cornerColor property

Instead of passing a simple colour name as the String value to the key, we can also assign an RGBA value. RGBA stands for red, green, blue and alpha, where alpha is the opacity. Let us see a code example of how we can do that −


<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>Assigning an RGBA value to the cornerColor property</h2>
	<p>You can select the textbox to see the corner colour</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("A little progress each day adds up to big results.", {
			backgroundColor: "#ffe5b4",
			width: 400,
			top: 70,
			left: 110,
			cornerColor: "rgba(255,69,0, 0.8)",
		});
		
		// Add it to the canvas
		canvas.add(textbox);
	</script>
</body>
</html>