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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...

The React.createElement method creates and returns a ReactElement element of a given type. The type parameter can be an html tag name string or a ReactClasss. This type parameter is required for createElement....

React.createFactory returns a function for generating ReactElement of a given type, similar to React.createElement. The type parameter can be an html tag name (for example: "div", "li", etc.) or a ReactClass object....

In the article "Beginner's Guide to React - Building a React Runtime Environment", we only introduced how to build a React runtime environment, which is actually how to reference the React library. But I think it is still a bit confusing for...

React, a front-end framework developed by Facebook, is very popular. There are two ways to run React, one is to use npm, and the other is not to use npm. These involve react-dom, babel, webpack, etc....