As of styled-components v2 you can interpolate other styled components to refer to their automatically generated class names. In your case you’ll probably want to do something like this: const Wrapper = styled.div` &:hover ${Button} { display: none; } ` See the documentation for more information! The order of components is important. It will only … Read more
You have to add a condition in your componentDidUpdate method. The example is using fast-deep-equal to compare the objects. import equal from ‘fast-deep-equal’ … constructor(){ this.updateUser = this.updateUser.bind(this); } componentDidMount() { this.updateUser(); } componentDidUpdate(prevProps) { if(!equal(this.props.user, prevProps.user)) // Check if it’s a new user, you can also use some unique property, like the ID (this.props.user.id … Read more
A simple solution is to use reduce() without second argument and without spreading the previous result: class List extends React.Component { render() { <div> {this.props.data .map(t => <span>{t}</span>) .reduce((prev, curr) => [prev, ‘, ‘, curr])} </div> } } Without second argument, reduce() will start at index 1 instead of 0, and React is perfectly happy … Read more
As of v16.2.0, there’s no way to turn a functional component into an error boundary. The React docs are clear about that, although you’re free to reuse them as many times as you wish: The componentDidCatch() method works like a JavaScript catch {} block, but for components. Only class components can be error boundaries. In … Read more
You’re probably using the DOM MouseEvent. Try using React.MouseEvent<HTMLInputElement> instead.
You can make use of history.listen() function when trying to detect the route change. Considering you are using react-router v4, wrap your component with withRouter HOC to get access to the history prop. history.listen() returns an unlisten function. You’d use this to unregister from listening. You can configure your routes like index.js ReactDOM.render( <BrowserRouter> <AppContainer> … Read more
You can create a new React app in the current directory by writing . instead of a project name. create-react-app .
To fix this issue simply upgrade react-scripts package (check latest version with npm info react-scripts version): Replace in your package.json “react-scripts”: “^3.x.x” with “react-scripts”: “^3.4.1” (or the latest available version) (optional for some) Delete your node_modules folder Run npm install or yarn install Some people reported that this issue was caused by running npm audit … Read more
The import line should be: import React, { Component } from ‘react’; Note the uppercase R for React.
You can write a custom hook to provide you a previous props using useRef function usePrevious(value) { const ref = useRef(); useEffect(() => { ref.current = value; }); return ref.current; } and then use it in useEffect const Component = (props) => { const {receiveAmount, sendAmount } = props const prevAmount = usePrevious({receiveAmount, sendAmount}); useEffect(() … Read more