when to use react context

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Shaun Modipane answered on January 4, 2021 Popularity 10/10 Helpfulness 1/10

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when to use react context

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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.

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Contributed on Mar 11 2023

Shaun Modipane

0 Answers Avg Quality 2/10

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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>
    )
}

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Source: Grepper

Tags: javascript j

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Contributed on Oct 31 2021

Confused Crossbill

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context api react

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import React from "react";
// 1. Create context - storing values
export const CartContext = React.createContext();
// CartContext.Provider
// this is you create that context box
// Provider

export function CartContextProvider({ children }) {
  const [cartCount, setCartCount] = React.useState(0);
  const handleCartUpdate = (val) => {
    setCartCount(cartCount + val);
  };
  const handleDec=(val)=>{

    setCartCount(cartCount + val);
  }

  return (
    <CartContext.Provider value={{ cartCount, handleCartUpdate,handleDec }}>
      {children}
    </CartContext.Provider>
  );
}

=====================navbar.jsx
import React from "react";
import { CartContext } from "../Context/CardContexr";

const Navbar = () => {
  const { cartCount } = React.useContext(CartContext);
  const{handleCartUpdate}= React.useContext(CartContext)
//   const { theme } = React.useContext(ThemeContext);

  return <>
  
  <h1 >Cart Count : {cartCount}</h1>

  <button onClick={()=>{handleCartUpdate(1)}} >change</button>
  </>
};

export default Navbar;

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Contributed on Aug 26 2022

Binod Nayak

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React Context API

Comment

/*
The React Context API uses a Provider and Consumer pattern to 
share data throughout an application. The provider role 
is played by a React componentthat makes data available to 
its descendant components. 

When one of those descendants accesses the shared data, 
it becomes a consumer.

To use the React Context API, we start by creating a React 
context object, a named object created by the
React.createContext() function.
*/

const MyContext = React.createContext();

/*
Context objects include a .Provider property that is 
a React component. It takes in a value prop to be stored
in the context.
*/

<MyContext.Provider value="Hello world!">
   <ChildComponent />
</MyContext.Provider>
/*
That value — in this case, the string "Hello world!" — is 
available to all its descendent components. Descendent 
components — in this case, ChildComponent — can then retrieve 
the context’s value with React’s useContext() hook.
*/

import { useContext } from 'react';
import { MyContext } from './MyContext.js'
 
const ChildComponent = () => {
  const value = useContext(MyContext);
  return <p>{value}</p>;
}
// Renders <p>Hello, world!</p>

/*
The useContext() hook accepts the context object as an 
argument and returns the current value 
of the context. Rejoice — prop drilling that value is 
no longer needed!

Note: If a component attempts to use a context that 
isn’t provided by one of its ancestors, useContext() will return null.
*/

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Contributed on Dec 30 2022

M Hassan khan

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react context api

Comment

DEFINITION::::::
Context provide a way to pass data through the component tree without 
having to pass down manually at every level

HOW TO USE::::::
DECLARATION:::
	const MyContext = React.createContext()
Creating a new Context for each unique piece of data that needs to be available
throughout your component data
	const LocaleContext = React.createContext()
Properties of LocaleContext --------
	LocaleContext.Provider
    LocaleContext.Consumer

What is a Provider 
	Allows us to "declare the data that we want available throughout our
	component tree"

What is a Consumer
	Allows "any component in the tree that needs that data to be able to 
    subscibe to it"

How to use Provider	
	<MyContext.Provider value={data}>
      <App />
    </MyContext.Provider>

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Contributed on Jan 04 2021

KROTUS

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react context

Comment

//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>
  );
}

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Source: www.freecodecamp.org

Tags: javascript j

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Contributed on Aug 13 2022

Shirshak Kandel

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React Context API

Comment

import React, { useState } from 'react'

const GlobalStateContext = React.createContext({ })

export const GlobalStateProvider = ({ children }) => {
    const [config, setConfig] = useState({
        projectInfo: ''
    })
    const [projectFile, setProjectFile] = useState('./test.cpp')
    const [executionState, setExecutionState] = useState("NoProject")

    return (
        <GlobalStateContext.Provider
            value={{
                executionState,
                config,
                projectFile,
                setExecutionState,
                setConfig,
                setProjectFile,
            }}
        >
            {children}
        </GlobalStateContext.Provider>
    )
}

export default GlobalStateContext

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Source: stackoverflow.com

Tags: api

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Contributed on Jan 10 2022

Noob Learner

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>
    </>
  );
}

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Source: www.codementor.io

Tags: javascript j

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Contributed on Jan 24 2022

Slow Mo

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react context api

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import { createContext, useContext, useReducer } from "react";

const Actions = {
	SET_ITEMS: "SET_ITEMS",
};

const reducer = (state, action) => {
	if (action.type === Actions.SET_ITEMS) {
		return { ...state, items: action.payload };
    }

	return state;
};

const initialState = {
	items: []
};

const SimpleContext = createContext(initialState);
export const useSimpleContext = () => useContext(SimpleContext);
export const SimpleProvider = ({ children }) => {
	const [state, dispatch] = useReducer(reducer, initialState);

	function setItems(items) {
		dispatch({ type: Actions.SET_ITEMS, payload: items });
	}

	return <SimpleContext.Provider value={{ state, setItems }}>{children}</SimpleContext.Provider>;
};

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Contributed on Mar 19 2022

Red Team

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use context in react detaiks

Comment

// Theme context, default to light theme
const ThemeContext = React.createContext('light');

// Signed-in user context
const UserContext = React.createContext({
  name: 'Guest',
});

class App extends React.Component {
  render() {
    const {signedInUser, theme} = this.props;

    // App component that provides initial context values
    return (
      <ThemeContext.Provider value={theme}>
        <UserContext.Provider value={signedInUser}>
          <Layout />
        </UserContext.Provider>
      </ThemeContext.Provider>
    );
  }
}

function Layout() {
  return (
    <div>
      <Sidebar />
      <Content />
    </div>
  );
}

// A component may consume multiple contexts
function Content() {
  return (
    <ThemeContext.Consumer>
      {theme => (
        <UserContext.Consumer>
          {user => (
            <ProfilePage user={user} theme={theme} />
          )}
        </UserContext.Consumer>
      )}
    </ThemeContext.Consumer>
  );
}

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Source: legacy.reactjs.org

Tags: javascript j

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Contributed on Sep 20 2023

Zany Zebra

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>
        )
    }
}

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Contributed on Aug 29 2022

Mohammad alshraideh

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when to use react context

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