Fixes#5352 . This updates the example updating react-i18next to v8.0.6, replacing the `translate` HOC to `withNamespaces` and `I18n` to `NamespacesConsumer`.
There is one thing that I am not sure if is correct or not so I need some guidance. You gotta wrap the page with the `withI18next` HOC so it will extend the `getInitialProps` of the page with this:
```
Extended.getInitialProps = async (ctx) => {
const composedInitialProps = ComposedComponent.getInitialProps
? await ComposedComponent.getInitialProps(ctx)
: {}
const i18nInitialProps = ctx.req
? i18n.getInitialProps(ctx.req, namespaces)
: {}
return {
...composedInitialProps,
...i18nInitialProps
}
}
```
The problem lies in `i18n.getInitialProps` that has this code:
```
i18n.getInitialProps = (req, namespaces) => {
if (!namespaces) namespaces = i18n.options.defaultNS
if (typeof namespaces === 'string') namespaces = [namespaces]
req.i18n.toJSON = () => null // do not serialize i18next instance and send to client
const initialI18nStore = {}
req.i18n.languages.forEach((l) => {
initialI18nStore[l] = {}
namespaces.forEach((ns) => {
initialI18nStore[l][ns] = (req.i18n.services.resourceStore.data[l] || {})[ns] || {}
})
})
return {
i18n: req.i18n, // use the instance on req - fixed language on request (avoid issues in race conditions with lngs of different users)
initialI18nStore,
initialLanguage: req.i18n.language
}
}
```
In my understanding, among other things, it gets the `i18n` object from the request (included by the `server.js`) and uses the data to create `initialI18nStore` and `initialLanguage`, and then return these two objects plus the `i18n` object itself. If you add the `i18n` object on the return, then there will be a crash on the client-side render of the page:
```TypeError: Cannot read property 'ready' of null```
I don't know why, but returning it breaks `NamespacesConsumer` component from `react-i18next` (the state becomes null). So I commented this line and the provider on `_app.js` is getting the `i18n` instance from the `i18n.js` file (the same as `server.js`). I don't know if this would be an issue so I would like help to debug this.
This fixes https://github.com/zeit/next.js/issues/5260 by making sure that `index.js` has `getInitialProps` defined on the page exported component, not the child component.
When fixing that, I uncovered an issue where the server side rendered HTML did not match the clientside HTML, so I reworked _app.js to use the `i18nextprovider` component which has props to hydrate the initial data (for SSR), and makes sure the correct i18n instance is passed to all child components through context.
Before:
```html
<!DOCTYPE html>
<html>
<head>
<meta charSet="utf-8" class="next-head"/>
<link rel="preload" href="/_next/static/development/pages/index.js" as="script"/>
<link rel="preload" href="/_next/static/development/pages/_app.js" as="script"/>
<link rel="preload" href="/_next/static/development/pages/_error.js" as="script"/>
<link rel="preload" href="/_next/static/runtime/webpack.js" as="script"/>
<link rel="preload" href="/_next/static/runtime/main.js" as="script"/>
</head>
<body>
<div id="__next"></div>
<script src="/_next/static/development/dll/dll_4a2ab6ce0cb456fbfead.js"></script><script>__NEXT_DATA__ = {"props":{"pageProps":{}},"page":"/","pathname":"/","query":{},"buildId":"development"};__NEXT_LOADED_PAGES__=[];__NEXT_REGISTER_PAGE=function(r,f){__NEXT_LOADED_PAGES__.push([r, f])}</script><script async="" id="__NEXT_PAGE__/" src="/_next/static/development/pages/index.js"></script><script async="" id="__NEXT_PAGE__/_app" src="/_next/static/development/pages/_app.js"></script><script async="" id="__NEXT_PAGE__/_error" src="/_next/static/development/pages/_error.js"></script><script src="/_next/static/runtime/webpack.js" async=""></script><script src="/_next/static/runtime/main.js" async=""></script>
</body>
</html>
```
After:
```html
<!DOCTYPE html>
<html>
<head>
<meta charSet="utf-8" class="next-head"/>
<link rel="preload" href="/_next/static/development/pages/index.js" as="script"/>
<link rel="preload" href="/_next/static/development/pages/_app.js" as="script"/>
<link rel="preload" href="/_next/static/development/pages/_error.js" as="script"/>
<link rel="preload" href="/_next/static/runtime/webpack.js" as="script"/>
<link rel="preload" href="/_next/static/runtime/main.js" as="script"/>
</head>
<body>
<div id="__next">
<h1>This example integrates react-i18next for simple internationalization.</h1>
<div>
<h1>welcome to next.js</h1>
<p>This example integrates react-i18next for simple internationalization.</p>
<p>test words for en</p>
<div><button>fire in the wind for en</button></div>
<p>You can either pass t function to child components.</p>
<p>Or wrap your component using the translate hoc provided by react-i18next.</p>
<p>Alternatively, you can use <code>Trans</code> component.</p>
<a href="/page2">Go to page 2</a><br/><a href="/page3">Go to page 3 (no hoc)</a>
</div>
</div>
<script src="/_next/static/development/dll/dll_4a2ab6ce0cb456fbfead.js"></script><script>__NEXT_DATA__ = {"props":{"pageProps":{"i18n":null,"initialI18nStore":{"en":{"home":{"welcome":"welcome to next.js","sample_test":"test words for en","sample_button":"fire in the wind for en","link":{"gotoPage2":"Go to page 2","gotoPage3":"Go to page 3 (no hoc)"}},"common":{"integrates_react-i18next":"This example integrates react-i18next for simple internationalization.","pureComponent":"You can either pass t function to child components.","extendedComponent":"Or wrap your component using the translate hoc provided by react-i18next.","transComponent":"Alternatively, you can use \u003c1\u003eTrans\u003c/1\u003e component."}}},"initialLanguage":"en-US"}},"page":"/","pathname":"/","query":{},"buildId":"development"};__NEXT_LOADED_PAGES__=[];__NEXT_REGISTER_PAGE=function(r,f){__NEXT_LOADED_PAGES__.push([r, f])}</script><script async="" id="__NEXT_PAGE__/" src="/_next/static/development/pages/index.js"></script><script async="" id="__NEXT_PAGE__/_app" src="/_next/static/development/pages/_app.js"></script><script async="" id="__NEXT_PAGE__/_error" src="/_next/static/development/pages/_error.js"></script><script src="/_next/static/runtime/webpack.js" async=""></script><script src="/_next/static/runtime/main.js" async=""></script>
</body>
</html>
```
- simplify pages by introducing withI18next hoc
- add Trans component example
- replace <div> with <p> in demo components to make text on pages easier to read
German translation by @marinaroot
