#html lang prop

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gusty shale
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how do i change lang prop of html tag? i use app router

broken fractalBOT
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Hi @gusty shale. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:

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In Next.js, you can change the lang attribute of the html tag based on the locale of the page. This can be done by using the params prop in your layout or page component to access the current locale. Here's an example:

export default function Root({ children, params }) {
 return (
 <html lang={params.lang}>
 <body>{children}</body>
 </html>
 )
}

In this example, params.lang will contain the current locale, such as 'en-US' or 'de'. This value is automatically provided by Next.js when you use internationalized (i18n) routing with the App Router.

Remember to nest all special files inside app/[lang] to enable the Next.js router to dynamically handle different locales in the route, and forward the lang parameter to every layout and page.

// app/[lang]/page.js
export default async function Page({ params: { lang } }) {
 return ...
}

For more information, you can refer to the Next.js documentation on internationalized routing (https://nextjs.org/docs/app/building-your-application/routing/internationalization#routing-overview) and static generation (https://nextjs.org/docs/app/building-your-application/routing/internationalization#static-generation).

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@gusty shale kapa.ai is still learning and improving, please let us know how it did by reacting below

gusty shale
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@broken fractal I generate many static pages using generateStaticParams
For example for my online store I create 100 pages with detailed information about each specific product.
The problem is that I need the price block to display different prices for different users depending on their status. How can I accomplish this?
I could check the user's status inside useEffect on the client, but that would result in the default price being displayed first and only after useEffect is triggered on the client will the actual price be displayed.

broken fractalBOT
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Let me check the knowledge base for you. One moment! :books:

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Based on the information from the knowledge sources, it seems that currently in Next.js, a page can either be fully static or fully dynamic. This means that if you're using generateStaticParams to statically generate your product pages, you can't have a part of the page (like the price block) be dynamic based on user-specific data.

However, there are a few workarounds you could consider:

  1. Client-side Rendering: As you mentioned, you could use useEffect to fetch the user-specific data on the client-side after the static page has been loaded. To avoid showing the default price first, you could show a loading spinner or a placeholder until the actual price is fetched.

  2. Dynamic Server Rendering: If the price needs to be part of the HTML (for SEO reasons, for example), you could consider using dynamic server rendering for the product pages instead of static generation. This would allow you to fetch the user-specific data on the server-side for each request. However, this would mean giving up the benefits of static generation, like faster load times.

  3. Hybrid Approach: Another approach could be to statically generate the common parts of the page using generateStaticParams, and then use client-side rendering for the user-specific parts. This would give you a mix of both static and dynamic rendering, but it might complicate your page structure.

It's worth noting that the Next.js team has mentioned in their documentation that they plan to introduce hybrid server-side rendering in the future, where layouts and pages in a route can be independently statically or dynamically rendered. This feature could potentially solve your problem, but it's not available yet.

#

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