Questions tagged [createcontext]
46 questions
0
votes
1 answer
console error :Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'data') at handleClick
In this page the user can login, but if the untilDate is bigger than the current date it should log out the user. The code runs fine 1/2 times, the other giving me the error on the title.
I am working with createContext for user login. This is the…
Mega Animenia
- 15
- 1
- 6
0
votes
1 answer
React createContext with defult value for use Mobx store
i am creating a context to use Mobx store in my React application, by following the example:
const mainStore = new MainStore(); // mobx store instance
const storeContext = React.createContext(mainStore);
export const useStores = () =>…
AshBadCoder
- 47
- 5
0
votes
0 answers
React Hooks - custom useAuth hook does not work as expected
I am new to react and am experimenting a bit. I have a bit of code and I am not sure why it is not working. I tried to implement an own hook & context to provide user authentication data along my application.
The main parts pf the coding are as…
MyUser
- 1
- 1
0
votes
1 answer
Why does useContext need the if statement when I use typescript?
It's just a simple createContext and useContext code. I struggled a lot until I realised that an if statement is necessary in the useTodoContext function. When I comment out the if statement line, then I get an error.
Can you tell me doesn't work…
venndi
- 161
- 9
0
votes
1 answer
how to use useEffect and useContext with fetching data?
I'm trying to use React's Context API as well as Hooks with fetching data.
I'm coding [createContext] like below, but it doesn't work.
import { createContext, useEffect } from "react";
export const ColorContext = createContext({});
export const…
Yuzu
- 59
- 1
- 8
0
votes
1 answer
React createContext running mutation function not working correctly
I am having a problem i can't seem to understand why is happening since i have the same example working in codesandbox, but in my app it shows a different behavior. In my app i can see the context from the consumer both the bool and the function,…
Holmar K
- 100
- 1
- 8
0
votes
1 answer
Reactjs update context from children component
Starting with ReactJS and NextJS
I have the following Layout component and using context to set values from the children component
export interface AuthContextModel {
title: string;
description: string;
showSignup: boolean;
}
export…
Anuj TBE
- 9,198
- 27
- 136
- 285
0
votes
2 answers
React.useContext appearing as undefined
This is my first time using the React context hooks in an app and my context default value keeps appearing as "undefined."
Troubleshooting so far:
I've made sure React.createContext is in a separate file (context.js)
I've made sure the child…
ariel-walley
- 17
- 3
- 9
0
votes
0 answers
React Native - How to update a value for entire application
What is the best way to find a value in the api request and make it available in the entire application? I need to get the total of unread messages and show it to the user in the application header. Every time you change pages, a new request is made…
Edinho Rodrigues
- 354
- 4
- 24
0
votes
1 answer
Why useReducer doesn't update state in React context
I'm using useReducer and context to update my state in App.js then send data to the database but it doesn't update the state and always is null.
App.js
import AuthContext from './context';
import screenA from './screenA';
export default function…
Ali Mahmoudi
- 83
- 2
- 8
0
votes
1 answer
problem call `useContext` then my other `state` set to default value
in my code i used one context for saving data and one state for get active id . my problem is when i setState and then setContext , when i get state value i see state set default value !
export default function AddKnowledgeScreen({ route,…
Meisan Saba
- 800
- 2
- 9
- 25
0
votes
4 answers
How to pass a value using `createContext` from parent to child's child component?
Instead of passing props from parent to child1(parent of child2) ->to child2,
I want to use createContext and receive the value with useContext.
What I tried to do is not correct because and I'm getting an error **'booleanContext' is not…
ExtraSun
- 528
- 2
- 11
- 31
0
votes
1 answer
Error importing context with React native
I'm learning to use context with React native, actually i'm following a blog where define how use createContext and useContext for Authentication logic in any app with React and Navigation.
In the blog not define how to import the class AuthService…
Dr oscar
- 359
- 1
- 4
- 16
0
votes
1 answer
Issue with state update approach for nested objects
Major EDIT
I have quite huge object which is 3 level deep. I use it as a template to generate components on the page and to store the values which later are utilized, eg:
obj =
{
"group": {
"subgroup1": {
"value": {
"type":…
Bastek Bastek
- 29
- 5
0
votes
1 answer
Import store using createContex mobximport store as props createContext mobx
there is a class that unites all classes of the store. You need to pass this class to app.js so that you can get it in any of the files using createContext
