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next.js/examples/with-react-helmet/pages/_document.js

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JavaScript

import Document, { Head, Main, NextScript } from 'next/document'
import Helmet from 'react-helmet'
export default class extends Document {
static async getInitialProps (...args) {
const documentProps = await super.getInitialProps(...args)
// see https://github.com/nfl/react-helmet#server-usage for more information
// 'head' was occupied by 'renderPage().head', we cannot use it
return { ...documentProps, helmet: Helmet.renderStatic() }
}
// should render on <html>
get helmetHtmlAttrComponents () {
return this.props.helmet.htmlAttributes.toComponent()
}
// should render on <body>
get helmetBodyAttrComponents () {
return this.props.helmet.bodyAttributes.toComponent()
}
// should render on <head>
get helmetHeadComponents () {
return Object.keys(this.props.helmet)
.filter(el => el !== 'htmlAttributes' && el !== 'bodyAttributes')
.map(el => this.props.helmet[el].toComponent())
}
get helmetJsx () {
return (<Helmet
htmlAttributes={{lang: 'en'}}
title='Hello next.js!'
meta={[
{ name: 'viewport', content: 'width=device-width, initial-scale=1' }
]}
/>)
}
render () {
return (<html {...this.helmetHtmlAttrComponents}>
<Head>
{ this.helmetJsx }
{ this.helmetHeadComponents }
</Head>
<body {...this.helmetBodyAttrComponents}>
<Main />
<NextScript />
</body>
</html>)
}
}