This is a great explanation and example of `getServerSideProps` in Next.js! Here's a breakdown of why this is a good explanation and some additional points that could be helpful: **Why this is a good explanation:** * **Clear Purpose:** It immediately states that `getServerSideProps` is for server-side rendering (SSR) and runs on the server for each request. * **Function Signature:** It correctly shows `export async function getServerSideProps() { ... }`. The `async` keyword is crucial for fetching data. * **Data Fetching Example:** The `fetch` API call to `https://api.example.com/data` is a standard and understandable way to demonstrate data fetching. * **Return Object Structure:** It correctly shows the `return { props: { data, }, };` structure, which is how data is passed to the page component. * **Page Component Usage:** It demonstrates how the `data` prop is received by the `HomePage` component and rendered. * **Readability:** The code is clean and easy to follow. **Additional points that could be helpful (optional, depending on the context):** 1. **Error Handling:** In a real-world scenario, you'd want to add error handling to the `fetch` call. ```javascript export async function getServerSideProps() { try { const res = await fetch('https://api.example.com/data'); if (!res.ok) { throw new Error(`API call failed with status: ${res.status}`); } const data = await res.json(); return { props: { data, }, }; } catch (error) { console.error("Error fetching data:", error); return { props: { data: null, // Or an empty object, or an error message error: error.message, // Pass error details to the page }, }; } } ``` 2. **`context` Object:** Mentioning the `context` object that `getServerSideProps` receives can be very useful, as it contains request-specific information like `params`, `query`, `req`, `res`, etc. ```javascript export async function getServerSideProps(context) { // context.params for dynamic routes (e.g., /posts/[id]) // context.query for query parameters (e.g., /search?q=nextjs) // context.req for the incoming request object (headers, cookies, etc.) // context.res for the outgoing response object (setting headers, cookies) // context.resolvedUrl for the normalized page path // context.locale, context.locales, context.defaultLocale for i18n const { req } = context; // Access request headers, for example // ... rest of your logic } ``` 3. **When to use `getServerSideProps` vs. `getStaticProps` vs. Client-side fetching:** Briefly touching upon the decision-making process can add significant value. * **`getServerSideProps`:** Use when data needs to be fresh on every request, or when the page content depends on the incoming request (e.g., user authentication, query parameters). * **`getStaticProps`:** Use when data can be pre-rendered at build time and is not user-specific. Faster for static content. * **Client-side fetching (e.g., `useEffect` with SWR/React Query):** Use for data that changes frequently *after* the initial page load, or for user-specific data that doesn't need to be indexed by search engines. 4. **Performance Considerations:** Mention that while powerful, SSR can be slower than SSG (`getStaticProps`) because it runs on every request, potentially increasing server load. 5. **`notFound` and `redirect`:** Briefly explain that `getServerSideProps` can also return `notFound: true` for 404 pages or `redirect` for redirects. ```javascript return { notFound: true, // Renders a 404 page }; return { redirect: { destination: '/new-path', permanent: false, // true for 301, false for 302 }, }; ``` Overall, the provided example is an excellent starting point for understanding `getServerSideProps` in Next.js.
How can you implement server-side rendering (SSR) in a Next.js application?
asked 1 year ago Asked
5 Answers
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In Next.js, server-side rendering (SSR) is implemented using the getServerSideProps function. This function runs on the server for each request and allows you to fetch data and pass it as props to the page component. Here’s a basic example:
// pages/index.js
export async function getServerSideProps() {
const res = await fetch('https://api.example.com/data');
const data = await res.json();
return {
props: {
data,
},
};
}
export default function HomePage({ data }) {
return (
<div>
<h1>Data from SSR</h1>
<pre>{JSON.stringify(data, null, 2)}</pre>
</div>
);
}
5 Answers
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'use client';
import { zodResolver } from '@hookform/resolvers/zod';
import { useForm } from 'react-hook-form';
import { z } from 'zod';
import { Button } from '@/components/ui/button';
import {
Form,
FormControl,
FormField,
FormItem,
FormMessage,
} from '@/components/ui/form';
import { useTheme } from '@/context/ThemeProvider';
import { createAnswer } from '@/lib/actions/answer.actions';
import { AnswerSchema } from '@/lib/validations';
import { Editor } from '@tinymce/tinymce-react';
import Image from 'next/image';
import { usePathname } from 'next/navigation';
import { useRef, useState } from 'react';
import { toast } from '../ui/use-toast';
interface props {
question: string;
questionId: string;
authorId: string;
}
function Answer({ question, questionId, authorId }: props) {
const pathname = usePathname();
const { mode } = useTheme();
const [isSubmitting, setIsSubmitting] = useState(false);
const [aiSubmitting, setAiSubmitting] = useState(false);
const editorRef = useRef(null);
const form = useForm<z.infer<typeof AnswerSchema>>({
resolver: zodResolver(AnswerSchema),
defaultValues: {
answer: '',
},
});
async function handleCreateAnswer(values: z.infer<typeof AnswerSchema>) {
setIsSubmitting(true);
try {
await createAnswer({
content: values.answer,
author: JSON.parse(authorId),
question: JSON.parse(questionId),
path: pathname,
});
form.reset();
if (editorRef.current) {
const editor = editorRef.current as any;
editor.setContent('');
}
} catch (error) {
console.log(error);
} finally {
setIsSubmitting(false);
}
console.log(values);
}
const generateAiAnswer = async () => {
setAiSubmitting(true);
try {
const response = await fetch(
`${process.env.NEXT_PUBLIC_SERVER_URL}/api/gemini`,
{
method: 'POST',
body: JSON.stringify({ question }),
}
);
const aiAnswer = await response.json();
const formattedAnswer = aiAnswer.reply.replace('/\n/g', '<br />');
toast({
title: 'AI Answer Generated Successfully!',
});
if (editorRef.current) {
const editor = editorRef.current as any;
editor.setContent(formattedAnswer);
}
} catch (error) {
toast({
title: 'AI Answer Generation Failed!',
});
console.log(error);
} finally {
setAiSubmitting(false);
}
};
return (
<div>
<div className="flex flex-col justify-between gap-5 sm:flex-row sm:items-center sm:gap-2">
<h4 className="paragraph-semibold text-dark400_light800">
Write your answer here
</h4>
<Button
disabled={aiSubmitting}
onClick={generateAiAnswer}
className="btn light-border-2 gap-1.5 rounded-md px-4 py-2.5 text-primary-500 shadow-none dark:text-primary-500"
>
{aiSubmitting ? (
<>Generating...</>
) : (
<>
<Image
src="/assets/icons/stars.svg"
alt="star"
width={12}
height={12}
className="object-contain"
/>
Generate AI Answer
</>
)}
</Button>
</div>
<Form {...form}>
<form
className="mt-6 flex w-full flex-col gap-10"
onSubmit={form.handleSubmit(handleCreateAnswer)}
>
<FormField
control={form.control}
name="answer"
render={({ field }) => (
<FormItem className="flex w-full flex-col gap-3">
<FormControl className="mt-3.5">
<Editor
apiKey={process.env.NEXT_PUBLIC_TINY_EDITOR_API_KEY}
onInit={(evt, editor) => {
// @ts-ignore
editorRef.current = editor;
}}
onBlur={field.onBlur}
onEditorChange={(content) => field.onChange(content)}
init={{
height: 350,
menubar: false,
plugins: [
'advlist',
'autolink',
'lists',
'link',
'image',
'charmap',
'preview',
'anchor',
'searchreplace',
'visualblocks',
'codesample',
'fullscreen',
'insertdatetime',
'media',
'table',
],
toolbar:
'undo redo | ' +
'codesample | bold italic forecolor | alignleft aligncenter |' +
'alignright alignjustify | bullist numlist',
content_style:
'body { font-family:Inter; font-size:16px }',
skin: mode === 'dark' ? 'oxide-dark' : 'oxide',
content_css: mode === 'dark' ? 'dark' : 'light',
}}
/>
</FormControl>
<FormMessage className="text-red-500" />
</FormItem>
)}
/>
<div className="flex justify-end">
<Button
type="submit"
className="primary-gradient w-fit text-white"
disabled={isSubmitting}
>
{isSubmitting ? 'Submitting...' : 'Submit'}
</Button>
</div>
</form>
</Form>
</div>
);
}
export default Answer;
