ReactJS checked Attribute
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:
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Step 1: Create a React application using the following command.
npx create-react-app foldername
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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' ;
const App = () => {
return <>
<div>
<h1>GeeksforGeeks</h1>
Input: <input type= 'checkbox' checked={ true } />
</div>
</>;
}
export default App
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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' ;
const App = () => {
return <>
<div>
<h1>GeeksforGeeks</h1>
Input: <input type= 'radio' checked={ true } />
</div>
</>;
}
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
Last Updated :
25 May, 2021
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