"reactjs context" Code Answer's
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reactjs context
Excited Elk
on Apr 23, 2020
==App.js========================================
import React from 'react';
import PageContextProvider from './PageContextProvider';
import Header from './Header';
function App() {
return (
<div className="App">
<PageContextProvider>
<Header />
</PageContextProvider>
</div>
);
}
export default App;
==PageContextProvider.js=========================
import React, { useState, useEffect, createContext } from 'react';
export const PageContext = createContext();
const PageContextProvider = (props) => {
const [user, setUser] = useState({
'name': 'harry potter'
});
return (
<PageContext.Provider value={{
user: user,
}}>
{props.children}
</PageContext.Provider>
);
}
export default PageContextProvider;
==Header.js=====================================
import React, { useContext } from 'react';
import { PageContext } from './PageContextProvider';
const Header = () => {
const { user } = useContext(PageContext);
return (
<div className="header">
{user.name}
</div>
);
}
export default Header;context in react
Colorful Cat
on Mar 17, 2021
// Context lets us pass a value deep into the component tree// without explicitly threading it through every component.// Create a context for the current theme (with "light" as the default).const ThemeContext = React.createContext('light');
class App extends React.Component {
render() {
// Use a Provider to pass the current theme to the tree below. // Any component can read it, no matter how deep it is. // In this example, we're passing "dark" as the current value. return (
<ThemeContext.Provider value="dark"> <Toolbar />
</ThemeContext.Provider>
);
}
}
// A component in the middle doesn't have to// pass the theme down explicitly anymore.function Toolbar() {
return (
<div>
<ThemedButton />
</div>
);
}
class ThemedButton extends React.Component {
// Assign a contextType to read the current theme context. // React will find the closest theme Provider above and use its value. // In this example, the current theme is "dark". static contextType = ThemeContext;
render() {
return <Button theme={this.context} />; }
}Source: reactjs.org
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