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#5620: Fix react-i18next example to properly SSR#5265

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timneutkens merged 2 commits intovercel:canaryfrom
ztanner:fix/5260-i18n
Sep 24, 2018
Merged

#5620: Fix react-i18next example to properly SSR#5265
timneutkens merged 2 commits intovercel:canaryfrom
ztanner:fix/5260-i18n

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@ztanner ztanner commented Sep 23, 2018 •
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This fixes #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:

<!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:

<!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>

@timneutkens
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timneutkens commented Sep 23, 2018

This looks really good 👍

@timneutkens timneutkens merged commit 9854c34 into vercel:canary Sep 24, 2018
@ztanner ztanner mentioned this pull request Sep 24, 2018
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Internationalization with react-i18next -> translations are not displayed server side

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@ztanner @timneutkens