React window works by only rendering part of a large data set. This module is very easy to integrate and reduces the amount of time which generally takes a while to render. This module avoids the over-allocation of DOM nodes. We can use the react-window module in React JS using the following approach.

Prerequisite:

• React
• Material UI

Approach to use react-window Module:

• Component Imports: Begin by importing necessary components from React, including ListItem and ListItemText from Material-UI, as well as the FixedSizeList from the react-window library. These components will be used to construct the scrollable list.
• Row Rendering Function: Define a function, such as renderOurRow, responsible for rendering individual rows within the FixedSizeList. This function takes care of creating ListItem elements with dynamic content based on the item index, ensuring efficient rendering for large datasets.
• Main Application Component: Create the main application component, typically named App. Within this component, utilize the FixedSizeList to render a list of a fixed size, specifying dimensions (height and width), item size, and the total number of items. Customize the content and appearance of each ListItem through the row rendering function.

Steps to create React Application And Installing Module:

Step 1: Create a React application using the following command.

npx create-react-app foldername

Step 2: After creating your project folder i.e. foldername, move to it using the following command.

cd foldername

Step 3: After creating the ReactJS application, Install the material-ui and react-window modules using the following command.

npm install @material-ui/core
npm install react-window

Project Structure:

The updated dependencies in package.json file will look like:

"dependencies": {
    "@material-ui/core": "^4.12.4",
    "react": "^18.2.0",
    "react-dom": "^18.2.0",
    "react-scripts": "5.0.1",
    "react-window": "^1.8.10",
    "web-vitals": "^2.1.4",
}

Example: Now write down the following code in the App.js file.

import React from "react";
import ListItem 
    from "@material-ui/core/ListItem";
import ListItemText 
    from "@material-ui/core/ListItemText";
import { FixedSizeList } 
    from "react-window";

function renderOurRow(props) {
    const { index } = props;

    return (
        <ListItem key={index} button>
            <ListItemText
                primary={`Sample Item ${index + 1}`} />
        </ListItem>
    );
}

export default function App() {
    return (
        <div style=
            {
                {
                    display: "block",
                    padding: 30
                }
            }>
            <h4>
                How to use react-window
                Module in ReactJS?
            </h4>
            <FixedSizeList height={250}
                width={300}
                itemSize={100}
                itemCount={5}>
                {renderOurRow}
            </FixedSizeList>
        </div>
    );
}

Step to Run Application: Run the application using the following command from the root directory of the project.

npm start

Output: Now open your browser and go to http://localhost:3000

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Article Tags :

• JavaScript
• Web Technologies
• ReactJS
• React-Questions