Warning: findDOMNode is deprecated in StrictMode. findDOMNode was passed an instance of Transition which is inside StrictMode
The setState call looks like it’s being written to the wrong place. Make sure it’s on the editTodo object:
reactjs
How to use onClick event on react Link component?
You are passing hello() as a string, also hello() means execute hello immediately. try
How to use switch statement inside a React component?
Try this, which is way cleaner too: Get that switch out of the render in a function and just call it passing the params you want. For example:
Uncaught Invariant Violation: Too many re-renders. React limits the number of renders to prevent an infinite loop
I suspect that the problem lies in the fact that you are calling your state setter immediately inside the function component body, which forces React to re-invoke your function again, with the same props, which ends up calling the state setter again, which triggers React to call your function again…. and so on. Instead, I … Read more
How to resolve “Cannot use import statement outside a module” in jest
Also using Babel, Typescript and Jest. Had the same failure, driving me crazy for hours. Ended up creating a new babel.config.js file specifically for the tests. Had a large .babelrc that wasn’t getting picked up by jest no matter what i did to it. Main app still uses the .babelrc as this overrides babel.config.js files. Install jest, ts-jest and babel-jest: babel.config.js (only used by … Read more
How to add multiple classes to a ReactJS Component?
I use classnames when there is a fair amount of logic required for deciding the classes to (not) use. An overly simple example: That said, if you don’t want to include a dependency then there are better answers below.
ReactJS giving error Uncaught TypeError: Super expression must either be null or a function, not undefined
Class Names Firstly, if you’re certain that you’re extending from the correctly named class, e.g. React.Component, not React.component or React.createComponent, you may need to upgrade your React version. See answers below for more information on the classes to extend from. Upgrade React React has only supported ES6-style classes since version 0.13.0 (see their official blog post … Read more
What does “export default” do in JSX?
Export like export default HelloWorld; and import, such as import React from ‘react’ are part of the ES6 modules system. A module is a self contained unit that can expose assets to other modules using export, and acquire assets from other modules using import. In your code: In ES6 there are two kinds of exports: Named exports – for example export function func() {} is a named … Read more
How to use callback with useState hook in react
You can use useEffect/useLayoutEffect to achieve this: More about it over here. If you are looking for an out of the box solution, check out this custom hook that works like useState but accepts as second parameter a callback function:
How to use callback with useState hook in react
You can use useEffect/useLayoutEffect to achieve this: More about it over here. If you are looking for an out of the box solution, check out this custom hook that works like useState but accepts as second parameter a callback function: