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How to lock the rotation of Textbox using FabricJS?
In this tutorial, we are going to learn how to lock the rotation of a Textbox using FabricJS. Just as we can specify the position, colour, opacity and dimension of a textbox object in the canvas, we can also specify whether we want to allow rotation or not. This can be done by using the lockRotation property.
Syntax
new fabric.Textbox(text: String, { lockRotation : Boolean }: 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
lockRotationis a property.
Options Keys
lockRotation? This property accepts a Boolean value. If we assign it a "true" value, then the object rotation will be locked.
Example 1: Default Behavior
Default behaviour of a Textbox object in the canvas
Let's see a code example to understand the default behaviour of a textbox object when lockRotation property is not used. By default, we can rotate a textbox object anticlockwise or clockwise.
<!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 behaviour of a Textbox object in the canvas</h2>
<p>You can try rotating the Textbox using rotation handle to see the default behaviour</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("Don't let yesterday take up too much of today.", {
width: 400,
left: 110,
top: 70,
fill: "orange",
strokeWidth: 2,
stroke: "green",
textAlign: "center",
});
// Add it to the canvas
canvas.add(textbox);
</script>
</body>
</html>
Example 2: Using lockRotation Property
Passing lockRotation as key with 'true' value
In this example, we will see how we can cease the ability of a textbox object to rotate by using the lockRotation property. As we can see, as soon as we try to rotate the textbox object, a not-allowed cursor is shown. This means that the rotation action is no longer allowed.
<!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 lockRotation as key with 'true' value</h2>
<p>Now we see a not-allowed cursor when we try to rotate the textbox</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("Don't let yesterday take up too much of today.", {
width: 400,
left: 110,
top: 70,
fill: "orange",
strokeWidth: 2,
stroke: "green",
textAlign: "center",
lockRotation: true,
});
// Add it to the canvas
canvas.add(textbox);
</script>
</body>
</html>
Key Points
The
lockRotationproperty is set tofalseby default, allowing rotationWhen set to
true, the rotation handles become disabledUsers will see a not-allowed cursor when attempting to rotate a locked textbox
Other transformations like moving and scaling remain unaffected
Conclusion
The lockRotation property in FabricJS provides precise control over textbox interactions. Use lockRotation: true to prevent unwanted rotations while preserving other editing capabilities.
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