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Create Rectangle on Hover using Fabric.js
In this tutorial, we are going to create a Rectangle with a help cursor on hover over objects using FabricJS. "help" is one of the native cursor styles available which can be used in the FabricJS canvas too. FabricJS provides various types of cursors such as default, all-scroll, crosshair, col-resize, row-resize, etc., that actually reuse the native cursor under the hood. The hoverCursor property sets the style of the cursor when hovered over a canvas object.
Syntax
new fabric.Rect({ hoverCursor: String }: 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 hoverCursor is a property.
Options Keys
hoverCursor This property accepts a String which determines the name of the cursor to be used on hovering over the canvas object. Using this, we can set the default cursor value when hovering over this rectangle object on the canvas.
Example 1
Passing the hoverCursor Key to the class
By default, when we hover over a rectangle object in the canvas, the cursor type is "move".Let’s see a code example to create a canvas with a help cursor while hovering over a rectangle object in FabricJS.
<!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 the hoverCursor Key to the class</h2>
<p>Hover over the rectangle to see the help cursor</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: 55,
top: 90,
width: 170,
height: 70,
fill: "#faf0e6",
padding: 9,
stroke: "#9370db",
strokeWidth: 5,
hoverCursor: "help",
});
// Add them to the canvas
canvas.add(rect);
</script>
</body>
</html>
Example 2
Demonstrating that this effects the instance only
In this example, we are passing the hoverCursor key to the rectangle class which means that The hoverCursor property would not be changed for every object in the canvas. Changes will only occur for that single object. This is illustrated in the code 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>Demonstrating that it affects the instance only</h2>
<p>Hover over the rectangle objects and observe that the help cursor applies to the left object only. We have not used the <b>hoverCursor</b> property on the right object.</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 rect1 = new fabric.Rect({
left: 55,
top: 90,
width: 170,
height: 70,
fill: "#faf0e6",
padding: 9,
stroke: "#9370db",
strokeWidth: 5,
hoverCursor: "help",
});
// Initiate another rectangle object
var rect2 = new fabric.Rect({
left: 325,
top: 90,
width: 170,
height: 70,
fill: "#9370db",
padding: 9,
stroke: "#e6e6fa",
strokeWidth: 5,
});
// Add them to the canvas
canvas.add(rect1);
canvas.add(rect2);
</script>
</body>
</html>
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