I want to show some records in a table using React but I got this error: Invalid hook call. Hooks can only be called inside of the body of a function component. This could happen for one of the following reasons: You might have mismatching versions of React and the renderer (such as React DOM) … Read more
Considering below hooks example import { useState } from ‘react’; function Example() { const [count, setCount] = useState(0); return ( <div> <p>You clicked {count} times</p> <button onClick={() => setCount(count + 1)}> Click me </button> </div> ); } Basically we use this.forceUpdate() method to force the component to re-render immediately in React class components like below … Read more
I’m migrating a React with TypeScript project to use hooks features (React v16.7.0-alpha), but I cannot figure out how to set typings of the destructured elements. Here is an example: interface IUser { name: string; } … const [user, setUser] = useState({name: ‘Jon’}); I want to force user variable to be of type IUser. My … Read more
I’m expecting state to reload on props change, but this does not work and user variable is not updated on next useState call, what is wrong? function Avatar(props) { const [user, setUser] = React.useState({…props.user}); return user.avatar ? (<img src={user.avatar}/>) : (<p>Loading…</p>); } codepen 6 Answers 6
I’m trying out the new React Hooks and have a Clock component with a counter which is supposed to increase every second. However, the value does not increase beyond one. function Clock() { const [time, setTime] = React.useState(0); React.useEffect(() => { const timer = window.setInterval(() => { setTime(time + 1); }, 1000); return () => … Read more
I’m trying React hooks for the first time and all seemed good until I realised that when I get data and update two different state variables (data and loading flag), my component (a data table) is rendered twice, even though both calls to the state updater are happening in the same function. Here is my … Read more
Lets say I have some state that is dependent on some other state (eg when A changes I want B to change). Is it appropriate to create a hook that observes A and sets B inside the useEffect hook? Will the effects cascade such that, when I click the button, the first effect will fire, … Read more
I am currently learning hooks concept in React and trying to understand below example. import { useState } from ‘react’; function Example() { // Declare a new state variable, which we’ll call “count” const [count, setCount] = useState(0); return ( <div> <p>You clicked {count} times</p> <button onClick={() => setCount(count + 1)}> Click me </button> </div> … Read more
Are there ways to simulate componentDidMount in React functional components via hooks? 11 Answers 11
Closed. This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 7 months ago. The community reviewed whether to reopen this question 7 months ago and left it closed: Original close reason(s) were … Read more
