Client components as suspense fallback

[grave pike]

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

---

Hmm, I don't know enough to give you a confident answer yet. However, you can refer to the Next.js documentation on Server and Client Components (https://beta.nextjs.org/docs/rendering/server-and-client-components) and Streaming and Suspense (https://beta.nextjs.org/docs/data-fetching/streaming-and-suspense) for more information on how to work with these features.

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[fluid lion]

@grave pike I have a <Counter /> component which adds 1 to a counter every 100ms and renders it. If I put it directly in the tree, it works fine, but if I put it in fallback of the Suspense, it stuck on 1. The client doesn't seem to execute

[grave pike]

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

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Based on the provided extracts, it seems that using a dynamic <Counter /> component as a fallback for a <Suspense> component might not be the intended use case for Suspense. The purpose of Suspense is to provide a fallback UI while the asynchronous data fetching or component loading is happening. Once the data is fetched or the component is loaded, the fallback UI is replaced with the actual content.

Here's an example of using Suspense with fallback UI from the extracts:

import { Suspense } from "react";
import { PostFeed, Weather } from "./Components";

export default function Posts() {
  return (
    <section>
      <Suspense fallback={<p>Loading feed...</p>}>
        <PostFeed />
      </Suspense>
      <Suspense fallback={<p>Loading weather...</p>}>
        <Weather />
      </Suspense>
    </section>
  );
}

In this example, the fallback UI is a simple static placeholder, such as <p>Loading feed...</p>. It's not intended to be a dynamic component like your <Counter />.

If you want to display a dynamic counter component while waiting for data fetching or component loading, you might need to implement a different approach, such as conditional rendering based on the data fetching status.

For more information on using Suspense, you can refer to the React Documentation (https://beta.reactjs.org/apis/react/Suspense).

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[fluid lion]

@grave pike How can I implement conditional rendering based on data fetching for for server components?

[grave pike]

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

---

To implement conditional rendering based on data fetching for server components, you can use the useSWR hook or a similar data fetching library. The useSWR hook returns the data, error, and a loading state, which you can use to conditionally render your components.

Here's an example using useSWR from the provided extracts:

import useSWR from 'swr';

const fetcher = (url: string) => fetch(url).then((r) => r.json());

export default function Page({ params }: { params: { id: string } }) {
  const { data, error } = useSWR(
    `https://jsonplaceholder.typicode.com/posts/${params.id}`,
    fetcher,
  );
  if (error) return 'Failed to load';
  if (!data) return 'Loading...';

  return data.title;
}

In this example, the component renders different content based on the data fetching status:

• If there's an error, it renders 'Failed to load'.
• If the data is not yet available, it renders 'Loading...'.
• If the data is available, it renders data.title.

You can adapt this pattern to your use case and conditionally render your components based on the data fetching status.

For more information on data fetching with Next.js, you can refer to the Data Fetching documentation (https://beta.nextjs.org/docs/data-fetching/fundamentals).

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

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[fluid lion]

@grave pike SWR is for client components, right? And I want to display a dynamic fallback while my server component is loading.

[grave pike]

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

---

Apologies for the confusion. You're correct that SWR is for client components. For server components, you can use React Server Components with Suspense to display a dynamic fallback while your server component is loading.

Here's an example of using Suspense with server components from the provided extracts:

import { Suspense } from "react";
import { PostFeed, Weather } from "./Components";

export default function Posts() {
  return (
    <section>
      <Suspense fallback={<p>Loading feed...</p>}>
        <PostFeed />
      </Suspense>
      <Suspense fallback={<p>Loading weather...</p>}>
        <Weather />
      </Suspense>
    </section>
  );
}

In this example, the fallback UI is a simple static placeholder. To display a dynamic fallback, you can replace the static placeholder with your dynamic <Counter /> component:

import { Suspense } from "react";
import { PostFeed, Weather } from "./Components";
import Counter from "./Counter";

export default function Posts() {
  return (
    <section>
      <Suspense fallback={<Counter />}>
        <PostFeed />
      </Suspense>
      <Suspense fallback={<Counter />}>
        <Weather />
      </Suspense>
    </section>
  );
}

This way, your dynamic <Counter /> component will be displayed while the server components are loading. Once the data is fetched or the components are loaded, the fallback UI will be replaced with the actual content.

For more information on using Suspense with server components, you can refer to the Streaming and Suspense documentation (https://beta.nextjs.org/docs/data-fetching/streaming-and-suspense).

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: