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How to disable the selectability of a Rectangle using FabricJS?
In this article, we are going to learn how to disable selectability of a Rectangle using FabricJS. Rectangle is one of the various shapes provided by FabricJS. In order to create a rectangle, we will have to create an instance of fabric.Rect class and add it to the canvas. In order to modify an object, we have to select it in FabricJS. However, we can change this behaviour by using the selectable property.
Syntax
new fabric.Rect{ selectable: Boolean }: Object)Parameters
Options (optional) − This parameter is an Object which provides additional customizations to our rectangle. 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 selectable is a property.
Options Keys
selectable − This property accepts a Boolean value. When a ‘false’ value is assigned to it, the object cannot be selected for modifications. Its default value is true.
Example 1
Default behaviour or when selectable property is set to "True"
Let’s see a code example to understand how the object behaves when by default the selectable property is set to True. We are allowed to select an object, move it around the canvas and make modifications to it when the selectable property is set to True.
<!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; selectable property is set to True</h2>
<p>You can try moving the rectangle around the canvas or scaling it to prove
that it's selectable.</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 rectangle object
var rect = new fabric.Rect({
left: 105,
top: 70,
width: 170,
height: 70,
fill: "#dcdcdc",
stroke: "#696969",
strokeWidth: 5,
});
// Add it to the canvas
canvas.add(rect);
</script>
</body>
</html>Example 2
Passing selectable property as key
In this example, we are assigning a False value to the selectable property. This means that we can no longer select the rectangle object for modifications.
<!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 selectable property as key</h2>
<p>You can try clicking on the rectangle to see that it is no longer selectable.</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 rectangle object
var rect = new fabric.Rect({
left: 105,
top: 70,
width: 170,
height: 70,
fill: "#dcdcdc",
stroke: "#696969",
strokeWidth: 5,
selectable: false,
});
// Add it to the canvas
canvas.add(rect);
</script>
</body>
</html>
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