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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: Using Color Name
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: Using RGBA Value
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 ?
<!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>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>
Key Points
- The
cornerColorproperty only affects the controlling corners when the textbox is selected - You can use color names like "orange", "red", "blue" etc.
- RGBA values allow you to control transparency with the alpha channel
- Hex color codes like "#ff4500" are also supported
Conclusion
The cornerColor property in FabricJS provides a simple way to customize the appearance of textbox selection handles. Use color names for simplicity or RGBA values when you need transparency control.
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