For the function fetchApiAndSetStateForWrongGuesses() I pass it two parameters called randNum and wrongGuess. randNum is just a number but wrongGuess is supposed to be a state. The problem is that when I pass wrongGuess to the function fetchApiAndSetStateForWrongGuesses() the setState doesn’t works. By …
Tag: setstate
Succeeded in fetching data, but it gives TypeError: Cannot read property ‘0’ of null
I have another problem today. ComponentDidMount seems to work fine(it brings data from the server), but when I try to use the data I received, it’d throw TypeError: Cannot read property ‘0’ of null. What I’m trying to do is to play one of the videos I received from fetching data from t…
Can’t set state in js react-native
Getting error while trying to setState in React Native. Code Error TypeError: undefined is not an object (evaluating ‘_this.setState’) Answer useState Hook Functional components don’t have access to setState method but useState hook. useState hook works by defining the name of value, e.g. fo…
Is there a well-established way to update local state immediately without waiting for an API response in React/Redux?
TL;DR: Is there some well-known solution out there using React/Redux for being able to offer a snappy and immediately responsive UI, while keeping an API/database up to date with changes that can gracefully handle failed API requests? I’m looking to implement an application with a “card view”…
React Setstate callback called but render delayed
I just started to learn to react 2 days ago and I’m having a hard time with react’s setstate method, all I know is use revstate parameter if want to change state based on previous state, and callback parameter to be executed right after the state change (please correct me if this wrong), so I just…
React Native Updating State with this.setState
Hi I’m trying to update the state data value (data:[]) from API. the issue is from the line highlighted: Answer Hi please check below code.
How to re-render a component on each of multiple state changes?
I’m still learning JS/React, so it’s likely I’m doing this completely wrong. Any criticism is welcome. I have a Canvas with a drawning on it. I want to change the color of the drawning multiple times when a button is pressed. To be clear: I want a single click on the button to change the col…
how to add and remove number without duplicate in the state object inside the array in Reactjs?
The below code which i’m using to add the data in the state the code is my State is Given Below im adding numeric value from 1 to 30 but when i try to add same number it adds to the array i should not add it again please give me solution Answer before updating the state perform an evaluation
how to update the state before rendering the component?
I have this app that adds “persons” to a “phonebook”, and the user can update the person’s phone if the person already exists. but I want to know to handle the problem of when the person was already deleted (i open two tabs and delete a phone in one tab, and I try to “updat…
reactjs setstate not working in function that has .map
Good Morning. Need help, i have the below script, the thing is the setState is not working, I think I’m missing something here? or Am i doing wrong. the “return” in the below is inside “.map” so i could display the 3 file in the array. Thanks Answer I imagine you want to recreate…