Since React components can be defined as an instance of a class, Class is a reserved word. So, developers must use the className attribute instead. In JSX, className attributes must be set equal to strings. A simple definition with multiple classes would look like this: Hi! Try edit me...
We can have multiple namedexportsin one module. Default Exports in React Defaultexportis used to export a single class, primitive, or function from a module. There are different ways to use defaultexport. Usually, the defaultexportis written after the function, like the example below. ...
import React from 'react'; import './styles.css'; function App(){ return ( Hello rock!! ) } export default App; Adding multiple class names conditionally We can add a multiple class names to the react element conditionally; by using template literals, ternary operator. Conditionally...
handleToggle}>Toggle class ); } } export default App; Toggle between two classnames Instead of adding or removing a class name, we can also toggle between two class names in react app. In this below example, by default container class is added to the div element, when we click on a ...
For instance, you can use refs to give focus on an input field when a button is clicked:import * as React from "react"; import ReactDOM from "react-dom"; export default function App() { const ref = React.useRef(); function focus() { ref.current.focus(); } return ( Focus...
importReactfrom'react';import'./App.css';functionApp(){return(Hello,WorldIam writingJSX)}exportdefaultApp; Copy Since the JSX spans multiple lines, you’ll need to wrap the expression in parentheses. Save the file. When you do you’ll see an error in the terminal running your server: Out...
In a React application, two levels of testing can be performed: End-to-End Testing is usually performed when the application is deployed and running with all its components rendered in the browser. Component Testing is performed during the development stage. It allows multiple tests with various ...
To create a custom React Component, create aLogo.jsfile in thesrcdirectory and add the following to it: exportdefaultfunctionLogo({fillColor}){return(<svg xmlns="http://www.w3.org/2000/svg"width="48"height="48"fill={fillColor}class="bi bi-google"viewBox="0 0 16 16"><path d="M...
className="App-link"href="https://reactjs.org"target="_blank"rel="noopener noreferrer">Learn React);}exportdefaultApp; Copy Delete the lineimport logo from './logo.svg';. Then replace everything in thereturnstatement to return a set of empty tags:<></>. This will give you a valid p...
How can we simulate returning multiple values from a function?When we call a function in JavaScript, we can only return one value using the return statement:const getAge = () => { return 37 } const getName = () => { return 'Flavio' }How can we return multiple values from a ...