How To Crop An Image

Nowadays, most modern apps and websites are searching for a way to crop an image from raw and dynamic image data.

In this blog, we will explore a popular React-based solution to get cropped images from image data. This library makes it easy to get cropped images by using simple and typical react components.

Prerequisites:

To continue with this blog, we are considering that you have a very good and clear understanding of react js and its components.

Getting Started:

react-easy-crop is a very popular image cropper react js library. react-easy-crop exports a set of primitives that enables us to get the cropped images by rendering things very easily. It works on the browser on the server and on mobile as a react application does.

It comes with a preview image which enables you to render the cropped image in the browser.

Steps to Implementation into React App:

1)Installing react-image-crop library:

To start with react-image-crop we need to add it to our react application.

npm i react-image-crop --save

2)Now, we are creating a component that can be used to take input images.

import React, { useState } from "react";

import ImageModal from "../cropper/ImageModal";

const ImageInput = ({

 name,

 onChange,

 showPreview,

 imageData,

 defaultPic,

}) => {

 const [image, setImage] = useState("");

 const [modalIsOpen, setModalIsOpen] = useState(false);

 const [height, setHeight] = useState(null);

 const [width, setWidth] = useState(null);




 //funcion to handle cropped image file and store it

 const onChangeHandler = file => {

   onChange({

     [name]: {

       data: file[0],

       src: URL.createObjectURL(file[0]),

     },

   });

 };




 //function to handle selected image file

 //check size of image and store it

 const handleFile = e => {

   if (e.target.files.length > 0) {

     const file = e.target.files;

     var url = URL.createObjectURL(file[0]);

     var img = new Image();

     img.src = url;

     img.onload = function () {

       setWidth(this.width);

       setHeight(this.height);

     };

     const maxAllowedSize = 5 * 1024 * 1024;

     if (file[0].size > maxAllowedSize) {

       console.log("max image size");

     } else {

         setImage(file[0]);

         setModalIsOpen(true);

     }

     e.target.value = null;

   }

 };

 let inputElement;




 return (

   <>

     <ImageModal

       modalIsOpen={modalIsOpen}

       closeModal={() => {

         setModalIsOpen(prevState => !prevState);

       }}

       image={image}

       onCropImage={croppedImg => onChangeHandler([croppedImg])}

       ratio={height / width <= 0.5 ? true : false}

     />

     {showPreview && (

       <div>




           <img

             key={imageData}

             src={imageData ? imageData : defaultPic}

             alt="img"

             onError={e => (e.target.src = defaultPic)}

           />

        

       </div>

     )}

     <div onClick={() => inputElement.click()}>Upload</div>

     <input

       ref={input => (inputElement = input)}

       accept="image/*"

       type="file"

       style={{ display: "none" }}

       onChange={handleFile}

     />

   </>

 );

};




export default ImageInput;


So in the above component, we are using the handleFile function to handle input coming from the user and set it as an image.

Also, we are using onChangeHandler function to store file getting from ImageModal as an object with data of an image and src as an image url

3)Creating a component using react-modal to show selected images into modal.

import React from "react";

import Modal from "react-modal";




const customStyles = {

 content: {

   top: "50%",

   left: "50%",

   right: "auto",

   bottom: "auto",

   marginRight: "-50%",

   transform: "translate(-50%, -50%)",

 },

};




 //ImageModal is use to cropped the store image using ImageCropperand 

 //preview cropped image

const ImageModal = ({ modalIsOpen, closeModal, image, onCropImage, ratio }) => {

 return (

   <div>

     <Modal

       isOpen={modalIsOpen}

       onRequestClose={closeModal}

       style={customStyles}

       contentLabel="Example Modal"

     >

       {image && (

         <ImageCropper

           imgName={image.name}

           onCropImage={onCropImage}

           inputImg={URL.createObjectURL(image)}

           closeModal={closeModal}

           ratio={ratio}

         />

       )}

     </Modal>

   </div>

 );

};




export default ImageModal;

In the above step, we are sharing image data to react-modal and ImageCropper. customStyles are used to place modal in center of the screen

4)Creating a main component from which we want to get a cropped image.

import React, { useCallback, useState } from "react";

import Cropper from "react-easy-crop";

import getCroppedImg from "./cropImage";

const ImageCropper = ({

 onCropImage,

 inputImg,

 imgName,

 closeModal,

 ratio,

}) => {

 const [crop, setCrop] = useState({ x: 0, y: 0 });

 const [zoom, setZoom] = useState(1);

 const [croppedAreaPixels, setCroppedAreaPixels] = useState(null);




 const onCropComplete = useCallback((croppedArea, croppedAreaPixels) => {

   setCroppedAreaPixels(croppedAreaPixels);

 }, []);




 //these function is used to preview cropped image 

 const showCroppedImage = useCallback(async () => {

   try {

     const croppedImage = await getCroppedImg(inputImg, croppedAreaPixels);

     onCropImage(

       new File([croppedImage], imgName, {

         type: "image/png",

         lastModified: new Date().getTime(),

       })

     );

   } catch (e) {

     console.error(e);

   }

 }, [croppedAreaPixels]);

 return (

   <div>

     <Cropper

       minZoom={0.4}

       image={inputImg}

       crop={crop}

       zoom={zoom}

       aspect={1}

       restrictPosition={false}

       onCropChange={setCrop}

       onCropComplete={onCropComplete}

       onZoomChange={setZoom}

       style={{

         containerStyle: {

           width: 500,

           height: 500,

           position: "relative",

         },

       }}

     />

     <div>

       <button

         onClick={closeModal}

       >Cancel</button>

       <input

         type="range"

         defaultValue={zoom}

         value={zoom}

         max={3.2}

         min={ratio ? 0.4 : 0.6}

         step={0.1}

         onChange={e => setZoom(e.target.value)}

       />

       <button

         onClick={() => {

           showCroppedImage();

           closeModal();

         }}>Save</button>

     </div>

   </div>

 );

};




export default ImageCropper;

In the above step, we are mainly using 3 tags and 1 third-party component. Those 3 tags are,

1. Cancel Button: Which is used to close modal without saving cropped images and also to remove saved image files. 

2. Range Input: Which is used to zoom in and zoom out images in Cropper.

3. Save Button: Which is used to save the cropped image and show the cropped image in the preview image section.

And a third-party component is Cropper from the react-easy-cropper package. We are using these to crop image

Demo:

image input component | Mindbowser

ImageInput Component

 

image modal and cropper | Mindbowser

Image Modal & Image Cropper

 

Code Sand Box | Mindbowser

 

Live Demo

CodeSandBox

 

coma

Conclusion:

As we see, react-easy-crop is a powerful tool for cropping images on the client side no matter what platform you are on.

Github: https://github.com/shubham-gapat/image-cropper

Shubham G

Full Stack Software Developer

Shubham is a full-stack developer with around 2+ years of experience in developing web applications. He has knowledge of ReactJs, Javascript, and Python Django framework. Also, has experience in creating REST APIs, developing web applications using python, and react. 

Get in touch for a detailed discussion.

Hear From Our 100+ Customers
coma

Mindbowser helped us build an awesome iOS app to bring balance to people’s lives.

author
ADDIE WOOTTEN
CEO, SMILINGMIND
coma

We had very close go live timeline and MindBowser team got us live a month before.

author
Shaz Khan
CEO, BuyNow WorldWide
coma

They were a very responsive team! Extremely easy to communicate and work with!

author
Kristen M.
Founder & CEO, TotTech
coma

We’ve had very little-to-no hiccups at all—it’s been a really pleasurable experience.

author
Chacko Thomas
Co-Founder, TEAM8s
coma

Mindbowser is one of the reasons that our app is successful. These guys have been a great team.

author
Dave Dubier
Founder & CEO, MangoMirror
coma

Mindbowser was very helpful with explaining the development process and started quickly on the project.

author
Hieu Le
Executive Director of Product Development, Innovation Lab
coma

The greatest benefit we got from Mindbowser is the expertise. Their team has developed apps in all different industries with all types of social proofs.

author
Alex Gobel
Co-Founder, Vesica
coma

Mindbowser is professional, efficient and thorough. 

author
MacKenzie R
Consultant at XPRIZE
coma

Very committed, they create beautiful apps and are very benevolent. They have brilliant Ideas.

author
Laurie Mastrogiani
Founder, S.T.A.R.S of Wellness
coma

MindBowser was great; they listened to us a lot and helped us hone in on the actual idea of the app.” “They had put together fantastic wireframes for us.

author
Bennet Gillogly
Co-Founder, Flat Earth
coma

They're very tech-savvy, yet humble.

author
Uma Nidmarty
CEO, GS Advisorate, Inc.
coma

Ayush was responsive and paired me with the best team member possible, to complete my complex vision and project. Could not be happier.

author
Katie Taylor
Founder, Child Life On Call
coma

As a founder of a budding start-up, it has been a great experience working with Mindbower Inc under Ayush's leadership for our online digital platform design and development activity.

author
Radhika Kotwal
Founder of Courtyardly
coma

The team from Mindbowser stayed on task, asked the right questions, and completed the required tasks in a timely fashion! Strong work team!

author
Michael Wright
Chief Executive Officer, SDOH2Health LLC
coma

They are focused, patient and; they are innovative. Please give them a shot if you are looking for someone to partner with, you can go along with Mindbowser.

author
David Cain
CEO, thirty2give
coma

We are a small non-profit on a budget and they were able to deliver their work at our prescribed budgets. Their team always met their objectives and I'm very happy with the end result. Thank you, Mindbowser team!!

author
Bart Mendel
Founder, Mindworks