ReactJS checked Attribute

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React.js library is all about splitting the app into several components. Each Component has its own lifecycle. React provides us some in-built methods that we can override at particular stages in the life-cycle of the component.

In this article, we will know how to use checked or defaultChecked attribute in checkbox input in React.js.

The checked attribute can be used with a checkbox or RadioButton element.

Creating 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
```

Project Structure: It will look like the following.

Example 1: Now write down the following code in the App.js file. Here, App is our default component where we have written our code.

App.js

import React from 'react'; 
  
// Defining our App Component 
const App = () => { 
  
  // Returning our JSX code 
  return <> 
    <div> 
      <h1>zambiatek</h1> 
        Input: <input type='checkbox' checked={true} /> 
    </div> 
  </>; 
} 
  
// Exporting your Default App Component 
export default App

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/, you will see the following output:

Example 2: Now write down the following code in the App.js file. Here, App is our default component where we have written our code.

Javascript

import React from 'react'; 
  
// Defining our App Component 
const App = () => { 
  
  // Returning our JSX code 
  return <> 
    <div> 
      <h1>zambiatek</h1> 
        Input: <input type='radio' checked={true} /> 
    </div> 
  </>; 
} 
  
// Exporting your Default App Component 
export default App

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/, you will see the following output:

Reference:https://reactjs.org/docs/dom-elements.html#checked

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