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# See https://help.github.com/articles/ignoring-files/ for more about ignoring files. | ||
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# dependencies | ||
/node_modules | ||
/.pnp | ||
.pnp.js | ||
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# testing | ||
/coverage | ||
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# next.js | ||
/.next/ | ||
/out/ | ||
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# production | ||
/build | ||
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# misc | ||
.DS_Store | ||
*.pem | ||
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# debug | ||
npm-debug.log* | ||
yarn-debug.log* | ||
yarn-error.log* | ||
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# local env files | ||
.env.local | ||
.env.development.local | ||
.env.test.local | ||
.env.production.local | ||
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# vercel | ||
.vercel |
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# Script component | ||
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This example shows different strategies that can be used for the [`next/script` component](https://nextjs.org/docs/basic-features/script): | ||
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- [Loading Polyfills](./pages/polyfill.js) | ||
- [Lazy loading](./pages/lazy.js) | ||
- [Executing code after loading](./pages/onload.js) | ||
- [Inline scripts](./pages/inline.js) | ||
- [Forwarding attributes](./pages/attributes.js) | ||
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## Preview | ||
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Preview the example live on [StackBlitz](http://stackblitz.com/): | ||
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[![Open in StackBlitz](https://developer.stackblitz.com/img/open_in_stackblitz.svg)](https://stackblitz.com/github/vercel/next.js/tree/canary/examples/script-component) | ||
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## Deploy your own | ||
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Deploy the example using [Vercel](https://vercel.com?utm_source=github&utm_medium=readme&utm_campaign=next-example): | ||
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[![Deploy with Vercel](https://vercel.com/button)](https://vercel.com/new/git/external?repository-url=https://github.com/vercel/next.js/tree/canary/examples/script-component&project-name=script-component&repository-name=script-component) | ||
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## How to use | ||
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Execute [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app) with [npm](https://docs.npmjs.com/cli/init) or [Yarn](https://yarnpkg.com/lang/en/docs/cli/create/) to bootstrap the example: | ||
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```bash | ||
npx create-next-app --example script-component script-component-app | ||
# or | ||
yarn create next-app --example script-component script-component-app | ||
``` | ||
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Deploy it to the cloud with [Vercel](https://vercel.com/new?utm_source=github&utm_medium=readme&utm_campaign=next-example) ([Documentation](https://nextjs.org/docs/deployment)). |
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{ | ||
"private": true, | ||
"scripts": { | ||
"dev": "next", | ||
"build": "next build", | ||
"start": "next start" | ||
}, | ||
"dependencies": { | ||
"next": "latest", | ||
"react": "^17.0.2", | ||
"react-dom": "^17.0.2" | ||
} | ||
} |
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import Link from 'next/link' | ||
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import '../styles/global.css' | ||
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const MyApp = ({ Component, pageProps, router }) => { | ||
const pathname = router.pathname | ||
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return ( | ||
<> | ||
<Component {...pageProps} /> | ||
{pathname !== '/' && ( | ||
<Link href="/"> | ||
<a>See all examples</a> | ||
</Link> | ||
)} | ||
</> | ||
) | ||
} | ||
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export default MyApp |
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import Script from 'next/script' | ||
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export default function Inline() { | ||
return ( | ||
<> | ||
{/* Attributes are forwarded */} | ||
<Script | ||
src="https://www.google-analytics.com/analytics.js" | ||
id="analytics" | ||
nonce="XUENAJFW" | ||
data-test="analytics" | ||
/> | ||
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<main> | ||
<h1>Forwarded attributes</h1> | ||
<h5> | ||
Open devtools and check that attributes has been forwarded correctly. | ||
</h5> | ||
</main> | ||
</> | ||
) | ||
} |
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import Link from 'next/link' | ||
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export default function Index() { | ||
return ( | ||
<main> | ||
<h1>Script component examples</h1> | ||
<ul> | ||
<li> | ||
<Link href="/polyfill"> | ||
<a>Polyfill</a> | ||
</Link> | ||
</li> | ||
<li> | ||
<Link href="/lazy"> | ||
<a>Lazy Loading</a> | ||
</Link> | ||
</li> | ||
<li> | ||
<Link href="/onload"> | ||
<a>Executing code after loading</a> | ||
</Link> | ||
</li> | ||
<li> | ||
<Link href="/inline"> | ||
<a>Inline scripts</a> | ||
</Link> | ||
</li> | ||
<li> | ||
<Link href="/attributes"> | ||
<a>Forwarding attributes</a> | ||
</Link> | ||
</li> | ||
</ul> | ||
</main> | ||
) | ||
} |
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import Script from 'next/script' | ||
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export default function Inline() { | ||
return ( | ||
<> | ||
{/* Execute arbitrary code */} | ||
<Script id="show-banner" strategy="lazyOnload"> | ||
{`document.getElementById('banner').classList.remove('hidden')`} | ||
</Script> | ||
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{/* Or */} | ||
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{/* <Script | ||
id="show-banner" | ||
dangerouslySetInnerHTML={{ | ||
__html: `document.getElementById('banner').classList.remove('hidden')` | ||
}} | ||
/> */} | ||
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<main> | ||
<h1>Inline scripts</h1> | ||
<h5 id="banner" className="hidden"> | ||
This is initially hidden but its being shown because the `Script` | ||
component removed the `hidden` class. | ||
</h5> | ||
</main> | ||
</> | ||
) | ||
} |
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import { useCallback, useEffect, useState } from 'react' | ||
import Script from 'next/script' | ||
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export default function Lazyload() { | ||
const [log, setLog] = useState([]) | ||
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const addLog = useCallback( | ||
(text) => { | ||
setLog((log) => log.concat({ time: new Date(), text })) | ||
}, | ||
[setLog] | ||
) | ||
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useEffect(() => { | ||
addLog(`Page loaded window.FB is undefined`) | ||
}, [addLog]) | ||
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return ( | ||
<> | ||
{/* We lazy load the FB SDK */} | ||
<Script | ||
src="https://connect.facebook.net/en_US/sdk.js" | ||
strategy="lazyOnload" | ||
onLoad={() => | ||
addLog(`script loaded correctly, window.FB has been populated`) | ||
} | ||
/> | ||
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<main> | ||
<h1>Lazy Loading FB sdk</h1> | ||
<h5>You can check `window.FB` on browser console</h5> | ||
<ul> | ||
{log.map(({ time, text }) => ( | ||
<li key={+time}> | ||
{time.toISOString()}: {text} | ||
</li> | ||
))} | ||
</ul> | ||
</main> | ||
</> | ||
) | ||
} |
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import { useMemo, useState } from 'react' | ||
import Script from 'next/script' | ||
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export default function Onload() { | ||
const [stripe, setStripe] = useState(null) | ||
const methods = useMemo( | ||
() => | ||
stripe | ||
? Object.entries(stripe.stripe).filter( | ||
([_key, value]) => typeof value === 'function' | ||
) | ||
: [], | ||
[stripe] | ||
) | ||
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function handleLoad() { | ||
const stripe = window.Stripe('pk_test_1234') | ||
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console.log('Stripe loaded: ', stripe) | ||
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setStripe({ stripe }) | ||
} | ||
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return ( | ||
<> | ||
{/* We load Stripe sdk */} | ||
<Script | ||
id="stripe-js" | ||
src="https://js.stripe.com/v3/" | ||
onLoad={handleLoad} | ||
/> | ||
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<main> | ||
<h1>Executing code after loading</h1> | ||
<div> | ||
<p>Stripe methods: </p> | ||
<ul> | ||
{methods.map(([method]) => ( | ||
<li key={method}>{method}</li> | ||
))} | ||
</ul> | ||
</div> | ||
</main> | ||
</> | ||
) | ||
} |
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import { useEffect, useRef, useState } from 'react' | ||
import Script from 'next/script' | ||
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import s from '../styles/polyfill.module.css' | ||
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export default function Polyfill() { | ||
const ref = useRef() | ||
const [lastIntersection, setIntersection] = useState(new Date()) | ||
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useEffect(() => { | ||
const observer = new IntersectionObserver( | ||
(intersections) => { | ||
const isIntersecting = intersections[0]?.isIntersecting | ||
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if (isIntersecting) { | ||
setIntersection(new Date()) | ||
} | ||
}, | ||
{ | ||
rootMargin: '45px', | ||
} | ||
) | ||
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observer.observe(ref.current) | ||
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return () => observer.disconnect() | ||
}, []) | ||
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return ( | ||
<> | ||
{/* We ensure that intersection observer is available by polyfilling it */} | ||
<Script | ||
src="https://polyfill.io/v3/polyfill.min.js?features=IntersectionObserverEntry%2CIntersectionObserver" | ||
strategy="beforeInteractive" | ||
/> | ||
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<main className={s.container}> | ||
<h1>IntersectionObserver Polyfill</h1> | ||
<h5>Scroll down to see when was the last intersection</h5> | ||
<section className={s.section}> | ||
<span ref={ref}> | ||
Last intersection at {lastIntersection.toTimeString()} | ||
</span> | ||
</section> | ||
</main> | ||
</> | ||
) | ||
} |
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* { | ||
font-family: sans-serif; | ||
box-sizing: border-box; | ||
} | ||
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.hidden { | ||
display: none; | ||
} |
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.section { | ||
height: 400vh; | ||
display: flex; | ||
align-items: center; | ||
justify-content: center; | ||
} |
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