I'm working on a next.js app and my page layout is going through the following hierarchy:
_app.js
Page.js
Header.js
PageContent.js
I need to pass some parameters from PageContent to Header without using redux.
Inside _app.js I have the following:
class Main extends App {
render() {
const {
Component,
pageProps,
apollo,
router: { route }
} = this.props;
return (
<ApolloProvider client={apollo}>
<Page
pathname={route.split("/")[1]}
{...pageProps}
localLinks={Component.LocalLinks}
render={props => <Component {...props} />}
/>
</ApolloProvider>
);
}
}
I'm assuming there should be a way to pass some propse (pageProps) from PageContent to _app and pass that down to Page and make them accessible to header. Is there a next.js specific trick here that I'm not familiar with?
Here's a full example with contexts (approach previously suggested in this other answer by slightly modifying https://github.com/vercel/next.js/tree/7df7c5e80515eea6745fd59e54d87e5ee709fe0c/examples/with-app-layout tested on Next.js 12.0.7 and React 17:
pages/_app.js
import React from 'react'
export const MyAppContext = React.createContext({
n: 0,
setN: undefined,
});
function Header(props) {
return <div>n = { props.n }</div>
}
export default function App({ Component, pageProps }) {
const [n, setN] = React.useState(0)
return (
<MyAppContext.Provider value={{n, setN}}>
<Header n={n} />
<Component {...pageProps} />
</MyAppContext.Provider>
)
}
pages/index.js
import { MyAppContext } from './_app.js'
import React from 'react'
export default function Home() {
const {n, setN} = React.useContext(MyAppContext)
setN(new Date().getTime())
return <div>test</div>
}
If it's something that depends only on the page and not props
The following works without contexts, I wonder if setting such attributes could cause any problems down the line:
pages/_app.js
function Header(props) {
return <div>n = { props.n }</div>
}
export default function App({ Component, pageProps }) {
return (
<>
<Header n={Component.n} />
<Component {...pageProps} />
</>
)
}
pages/index.js
export default function Home() {
return <div>test</div>
}
Home.n = 1
You can use context api or Parent container state (here Page component).
First Way -> Use context api
Second Way
** Third way **
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