Example: https://codesandbox.io/s/react-hooks-playground-forked-15ctx?file=/src/index.tsx One parent with one useState hook and 3 children with a useEffect hooks. I want the children to update the state in the parent via a callback so that all the components state are updated into one object in the parent. Th…
Tag: react-hooks
How make filter in sub component in reactjs?
The list doesn’t update after sorting in the parent component. console.log(‘sortedList’, sorted); – sort correctly ListFilter component: What is wrong? Answer The re-render is skipped because you have mutated state. It was mutated from within a child component making it even harder to …
React Native hooks usage with multiple objects
I am trying to create a todo list app, with a Share button that can share the todo list you have. The app is almost complete, the other parts of the code is irrelevant I thought but if needed I can post them. My state is like this: My share function is like this – directly taken from the official
React: how to avoid re-rendering a component with a hook that returns always the same value but changes its inner state
imagine to have this hook that changes his value every second and returns true if the random value is a multiple of 5 otherwise false. what can I do to stop re-rendering every second? PS: I tried useMemo, and useRef to return back always the same object but it’s still re-rendering. please help Answer I …
Recursive function in useImperativeHandle
My code is like below but I getting checkSome is not defined error, from inside the checkSome function, how can I call checkSome(el) Answer You need to use this keyword. Try this: You can read more from here.
React hooks callback ref pattern
I often face this situation with react callbacks: The problem is. I consider my component should only load one time. And with useEffect, i have to set onLoad in the dependencies, this cause any change to the onLoad prop to trigger the effect. I generally solve this issue with a ref It works well and solve a l…
slickGoTo doesn’t change active slide
I added slider using react-slick to my React app. For <Slider> I added ref, and I’m trying use it to change active slide: but I got an error: TypeError: sliderRef.slick is not a function Why doesn’t this work for me? “react”: “^16.6.3”, “react-slick”: R…
Context value (coming from state) gets cleared while refreshing the page
I have a react application which I am using context API as a state management in it. I get the a specific value from the server, assign it to a component state and then store it as the context value. But, the problem is that any time the page refreshes and reloads, the context value gets cleared as the aforem…
Converting componentDidMount into useEffect
I am trying to learn React hooks, and trying to convert existing codebase to use hooks, but I am confused. Is it normal to set state inside useEffect? Would I be causing the dreaded infinite loop if I do so? My original class based component: Answer It’s okey to set state inside useEffect as long as you…
Redirect to previous component on button click (React Routing)
I have a react component that renders when i click on a menu option, this page has a form to complete and that’s done, onSubmit i want to redirect it to the component that the user clicked before. I tried to redirect it with Redirect and also using useHistory(), but none of them are working, this is wha…