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react context

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Confused Crossbill answered on October 31, 2021 Popularity 10/10 Helpfulness 4/10

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react context

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// ---------------- Parent.js 
import {createContext , useState} from "react";

let contextName = createContext( ) // you can optionally pass it a default value // it returns a "provider" object 

let Parent = () => {
    let [count , setCount] = useState()    // returns an [ state variable , state setter fn]. you can pass useState() a default value too
    				// the stateSetter function is async
    return ( 
        <div> 
            <contextName.Provider value={ {count , setCount } } >	// you can send multiple things across to the consumers by adding them in a single object
                <B/>
            </contextName.Provider> 
        </div>
    )
}

export {contextName};
export default Parent;


// file that consumes the context 
// --------- Child.js -----------

import {useContext} from "react";   // import the useContext hook that will allow you to actually use the created and imported context 
import {contextName } from "./Parent";   // import the particular context that you want to use 

let Child = () => {
    let value = useContext(contextName);
    return (
        <div> {value} </div>
    )
}

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: Grepper

Tags: javascript react-context

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Contributed on Oct 31 2021

Confused Crossbill

0 Answers Avg Quality 2/10

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react context

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//React context allows us to pass data to our component tree without using props.
To use Context, we use the createContext function from React.
The created context includes a Provider and a Consumer property, which are each components.
We wrap the Provider around the component tree that we want to pass
the given value down.
Next, we place the Consumer in the component we want to consume the value.
import { createContext } from 'react';

const NameContext = createContext('');

function App() {
  return (
    <NameContext.Provider value="John Doe">
      <Body />
    <NameContext.Provider>
  );
} 

function Body() {
  return <Greeting />;
} 

function Greeting() {
  return (
    <NameContext.Consumer>
      {name => <h1>Welcome, {name}</h1>}
    //we got function with name argument which we will use
    </NameContext.Consumer>
  );
}

//using useContext hook 
 rewrite our example from earlier, using the useContext hook:

import { createContext, useContext } from 'react';

const NameContext = createContext('');

function App() {
  return (
    <NameContext.Provider value="John Doe">
      <Body />
    <NameContext.Provider>
  );
} 

function Body() {
  return <Greeting />;
} 

function Greeting() {
	const name = useContext(NameContext);
  //useContext with name of context
  return (
    <h1>Welcome, {name}</h1>
  );
}

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: www.freecodecamp.org

Tags: javascript j

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Contributed on Aug 13 2022

Shirshak Kandel

0 Answers Avg Quality 2/10

Create a context in react

Comment

import React, { createContext, useReducer } from "react";
import reducer, { initialState } from "./reducer";

export let todoContext = createContext({});

export default function Provider({ children }) {

  const [state, dispatch] = useReducer(reducer, initialState);

  const values = {
    state,
    dispatch
  };

  return (
    <>
      <todoContext.Provider value={values}>
        {children}
      </todoContext.Provider>
    </>
  );
}

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: www.codementor.io

Tags: javascript j

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Contributed on Jan 24 2022

Slow Mo

0 Answers Avg Quality 2/10

React.createContext() is a React API for creating context objects. It allows you to pass data through the component tree without having to pass props down manually at every level. It is mainly used when some data needs to be accessible by many components at different nesting levels.

For example, consider a React app that has a context of a user, which includes information such as the user's name, email, and age. This context can be passed down through the component tree, allowing any component to access the data without needing to pass props manually.

// Create the context
const UserContext = React.createContext();

// Provide a context value
const App = () => (
  <UserContext.Provider value={{ name: 'John', email: 'john@example.com', age: 32 }}>
    <Layout />
  </UserContext.Provider>
);

// Access the context value
const Layout = () => (
  <UserContext.Consumer>
    {(user) => (
      <div>
        <p>Name: {user.name}</p>
        <p>Email: {user.email}</p>
        <p>Age: {user.age}</p>
      </div>
    )}
  </UserContext.Consumer>
);

export default App;

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Mar 01 2023

Ziad Kermadi

0 Answers Avg Quality 2/10

react create context

Comment

import React from "react";
export const ThemeContext = React.createContext();

export default class Theme extends React.Component {
    constructor(props) {
        super(props);
        this.state = {
            mode: "dark",
            toggleMode: this.toggleMode
        }
    }
    toggleMode = () => {
        console.log('yes');
        this.setState({
            mode: this.state.mode === 'dark' ? 'light' : 'dark'
        });
    }
    render() {
        return (
            <ThemeContext.Provider value={this.state} >
                {this.props.children}
            </ThemeContext.Provider>
        )
    }
}

Popularity 10/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Aug 29 2022

Mohammad alshraideh

0 Answers Avg Quality 2/10

what is use context in react

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Popularity 10/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jan 25 2023

deepak soni

0 Answers Avg Quality 2/10

when to use react context

Comment

context is just a set of variables and functions, you will use context if multiples files needs the same variables or functions and when multiple of react component needs the same variables or functions

for me the best tool for context/state management is recoil.js, ohh i don't know if it is just recoil but UI/UX loading is faster if you set the data to state before you populate.

Popularity 10/10 Helpfulness 1/10 Language whatever

Source: Grepper

Tags: javascript j

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Contributed on Mar 11 2023

Shaun Modipane

0 Answers Avg Quality 2/10

react context

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