How to check if an image has cropping applied using FabricJS?
In this tutorial we will show you how to check if an image has cropping applied Use FabricJS. We can create an Image object by creating an instance of fabric.Image. Since it is one of the basic elements of FabricJS, we can easily customize it as well Apply properties such as angle, opacity, etc. to find if the image has been cropped When applying, we use the hasCrop method. This method returns false if the crop is not Applied, or the applied crop value if applied.
grammar
hasCrop(): Boolean | Number
UsehasCropMethod
Example
In this example, we use the hasCrop method to find whether the Image object Applied crops. In this case our image object does not have any image cropping The logged output is false.
<!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>Using the hasCrop method</h2>
<p>
You can open the console from dev tools to see that the logged output is false
</p>
<canvas id="canvas"></canvas>
<img src="https://www.tutorialspoint.com/images/logo.png" id="img1" style="display: none" />
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
// Initiating the image element
var imageElement = document.getElementById("img1");
// Initiate an Image object
var image = new fabric.Image(imageElement, {
top: 50,
left: 110,
});
// Add it to the canvas
canvas.add(image);
// Using the hasCrop method
console.log("Is crop applied for the Image object?: ", image.hasCrop());
</script>
</body>
</html>
Using the hasCrop method and the cropY attribute
Example
Let's look at a code example of the output logged when using the hasCrop method with the cropY attribute. We have passed the value 2 to the cropY property which will Make sure the image object has a 2px image crop in the Y direction. in this case, The clipping value is returned in the console.
<!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>Using the hasCrop method along with cropY property</h2>
<p>
You can open the console from dev tools to see that the logged output is 2
</p>
<canvas id="canvas"></canvas>
<img src="https://www.tutorialspoint.com/images/logo.png" id="img1" style="display: none" />
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
// Initiating the image element
var imageElement = document.getElementById("img1");
// Initiate an Image object
var image = new fabric.Image(imageElement, {
top: 50,
left: 110,
cropY: 2,
});
// Add it to the canvas
canvas.add(image);
// Using the hasCrop method
console.log(
"Crop value applied for the Image object is: ",
image.hasCrop()
);
</script>
</body>
</html>
in conclusion
In this tutorial, we use two examples to demonstrate how to check whether an image Cropping was applied using FabricJS.
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