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Passing events and arguments onClick in React: Pass an inline function to the onClick attribute of the element. The function should get the event object and call handleClick. Pass the event and arguments to handleClick. const App = () = { const handle...

To remove an event listener in React: Add an event listener in the useEffect hook. Return a function from the useEffect hook. When the component unmounts, remove the event listener using the removeEventListener method. import {useRef, useEffect} from ...

Using conditions in map() in React: Call the map() method on an array. Use an if condition to explicitly return if the condition is met. Otherwise return a different value or return null to render nothing. export default function App () { const arr =...

To call multiple onClick functions in React: Set the onClick attribute on the element. Call other functions in the event handler. The event handler can call as many other functions as needed. export default function App () { const s...

Find all elements by className in React: Use the getElementsByClassName method to get all elements with a specific class. Place the call to this method in the useEffect() hook. import {useEffect} from react ; const App = () = { useEffect }...

To check if an element has focus in React: Set the ref attribute on the element. After the element is rendered, check if the element is the active element in the document. If so, the element is focused. import {useEffect, useRef} from react ; export d...

Looping over an array of objects in React: We use the map() method to iterate over an array. The function we pass to map() is called for each element in the array. The method returns a new array containing the results of the function passed in. export...

Get the class name of an element using event.target in React To get the class name of an element: Set the onClick attribute on the element to the event handler function. Access the element's class name as event.currentTarget.className . export default...

Use the more verbose fragment syntax to add a key attribute to a React fragment, for example React.Fragment key={key} . The more verbose syntax achieves the same result of grouping a list of elements without adding extra nodes to the DOM. import React...

This article mainly introduces how to use webpack to package and compile React mixed with ES6 and CommonJs. It is a process of upgrading the React environment....

Two ways to implement ref callback function in React...

React component reference ref can be said to be a component identifier. Ref is commonly used to make input get focus. Because render returns only virtual DOM, ref is used here....

It is very convenient to compile and package react using webpack. Both need to be installed using npm. However, if you do not pay attention to the installation location of webpack and react parser babel during use, problems will occur during...

In all the terms of React, there are five core types that we need to remember. These five types are ReactElement / ReactElement Factory ReactNode ReactComponent / ReactComponent Class...

Before using React.createClass, lets look at the official explanation ReactClass createClass(object specification) Create a component class with a given specification (the specification is the object specification). This component implement...