React JS - How to drag drop image upload step by step

hello everyone in today's digital age uploading images is an essential feature for any web application and if your react.js developer you might be wondering how to implement a drag and drop image upload feature in your project well you're in luck in this video tutorial we'll walk you through the step-by-step process of building a drag and drop image upload feature in react.js from setting up the necessary components to handling user interactions we'll cover all the essential aspects of building a robust image upload feature in react.js so whether you're a seasoned react.js developer or just getting started this video will provide you with the knowledge and tools you need to implement a drag and drop image upload feature in your next project okay we will start making a simple demo first I will create a reacts project with the command npx create react app drag drop images you will have to wait a bit for the npm packages to be installed okay now I will open the project with Visual Studio code here I'm going to write a template you can follow it on the screen I won't say much about it this code is a react component called drag drop image uploader that utilizes Hook's use State and use ref to manage the state of the component import react use State use ref from react this Line Imports react as well as the use State and use ref hooks from the react Library const images set images you State this line initializes a state variable called images using the use statehook which starts as an empty array the set images function is used to update this state variable later on const is dragging set is dragging new state false this line initializes another state variable called is dragging using the use State hook which starts as false the settings dragging function is used to update this state variable later on cons file input refuse ref no this line initializes a ref called file input ref using the use ref hook which is used to reference the file input element in the components jsx the initial value of the ref is set to null this code represents a file input element that allows users to select one or more files the ref attribute is used to reference the file input element and the on change event listener is used to handle the user's file selection this is a ternary operator that displays different text depending on the state of these dragging variable when his dragging is true the code displays a message that says drop images here using a span element with the class select this indicates to the user that they can drop images onto this component to upload them when his dragging is false the code displays two lines of text the first line says drag and drop image here or and the second line says browse using a span element with the class select the browse text is a clickable button that calls the select files function when clicked this provides an alternative way for the user to select images rather than just dragging and dropping cons files events Target files this line gets the selected files from the files property of the event object passed to the function if file's length equals zero return this line checks if any files were selected if no files were selected the function exits for let I equals 0 I files length I plus this line starts up for Loop that iterates through each selected file if files I tag split slash zero other image continue this line checks if the file is an image by checking if the first part of the file's mime type the part before the slash character is image if it's not an image the loop skips to the next file if images from the name equals files I name this line checks if the image with the same name already exists in the images State array using the sum method if it doesn't exist the code inside the if statement is executed set images prep images prev images this line updates the images State array using the set images function it creates a new array with the same elements as the previous state array along with a new object that represents the uploaded image the object has two properties name which is set to the file's name and URL which is set to a temporary URL created using the create object URL method of the URL API this Code maps over the image's state array and returns a new array of jsx elements for each element in the images array a new development with the class image is created and inside it there is a span element with the class delete and an image element foreign this is a function in JavaScript that deletes an image from a list of images stored in a state variable using the use statehook the div element has a class name of drag area and three event handlers on drag over on drag leave and on drop these handlers are used to control the behavior of the drag and drop feature the on drag over function is triggered when a file is being dragged over the designated area it prevents the default behavior of the browser which is to open the file when it's dropped and sets these dragging State variable to true it also sets the drop effect of the dragged item to copy which is a visual cue to the user that the item can be dropped at that location the on drag leave function is triggered when a file is dragged out of the designated area it also prevents the default behavior of the browser and sets these dragging State variable to false the on drop function is triggered when a file is dropped onto the designated area it prevents the default behavior of the browser sets the is dragging State variable to false and gets the array of drop files from the events data transfer object the function then iterates over each file in the array and for each image file it checks if the file has not already been added to the image's state array by checking its name if the file is a new image file it is added to the image's state array using the set images function which updates the state and triggers a re-render of the component the new image is added to the image's state array as an object with two properties name which is the name of the file and URL which is a URL created using the URL create object URL method this URL represents a temporary reference to the drop file which can be used to display the image in the UI okay in this video I only guide the processing in the client if you want to save the image to the back end please comment below and I will do it thank you for watching the video bye

Channel: HHV Technology

Views: 11,081

Keywords: drag drop image reactjs, drag and drop image upload reactjs, drag and drop image reactjs, drag drop react example, drag and drop react list, drag and drop ui examples, drag and drop examples, react dropzone drag and drop not working, drag and drop image example, drag and drop image react, react drag and drop image upload, drag and drop image in react js codepen, react-drag-drop-container example, react drag and drop image, react draggable image, drag and drop image in reactjs

Id: b-9Hw03yzTs

Length: 15min 49sec (949 seconds)

Published: Thu May 04 2023