In this article, we will learn the basics of the checkbox in the React.js application.

Prerequisites of React

Create React Project

To create a React app, use the following command in the terminal.

npx create-react-app matui

Install Bootstrap

Now install Bootstrap by using the following command.

npm install bootstrap

Now, open the index.js file and add the import Bootstrap.

import 'bootstrap/dist/css/bootstrap.min.css';

Now right-click on the src folder, create a new component named 'checkboxdemo.js', and follow the code.

import React from "react";
const Checkboxdemo = () => {
    const [allchecked, setAllChecked] = React.useState([]);
    function handleChange(e) {
        if (e.target.checked) {
            setAllChecked([...allchecked, e.target.value]);
        } else {
            setAllChecked(allchecked.filter((item) => item !== e.target.value));
        }
    }
    return (
        <div>
            <div class="col-sm-12 btn btn-info"> How to Use CheckBox in React</div>
            <div>
                <input value="One" type="checkbox" onChange={handleChange} />
                <span> Delhi </span>
            </div>
            <div>
                <input value="Two" type="checkbox" onChange={handleChange} />
                <span> Mumbai </span>
            </div>
            <div>
                <input value="Three" type="checkbox" onChange={handleChange} />
                <span> Jaipur </span>
            </div>
            <div>Checked values  {allchecked.join(" , ")}</div>
        </div>
    );
};
export default Checkboxdemo;

Now, import the checkboxdemo component in the src/App.js file.

import './App.css';
import Checkboxdemo from './checkboxdemo'
function App() {
  return (
    <div className="App">
      <Checkboxdemo/>
    </div>
  );
}

export default App;

Now, run the project using the 'npm start' command and check the result.

Check Box

Summary

In this article, we learned the basics of checkboxes in the React.js application.