Implementing CSS injection on a Next.js page during server-side rendering - tips and tricks!

Question

Implementing CSS injection on a Next.js page during server-side rendering - tips and tricks!

I recently started working with next js.

In my _app.tsx page, I have the following code:

import '../styles/antd.css'
import '../styles/globals.css'
import type { AppProps } from 'next/app' 

function MyApp({ Component, pageProps }: AppProps) {
  return (
    <> 
      <Component {...pageProps} /> 
    </>
  )
}

export default MyApp

The issue I am facing is that the styles - import '../styles/antd.css' are being loaded as an external request during production run at

/_next/static/css/fffc165f54adb267.css

. This results in a one second lag during the styles loading. Is there a better way to load styles in my base page without making external requests for styles?

css next.js server-side-rendering

Answer 1

Answer №1

Next.JS documentation discusses the process of importing CSS states.

During production, all CSS files are automatically merged into a single minified .css file.

When using SSR, the markup is transmitted to the user's DOM, with a link tag pointing to your styles. The user must fetch and interpret the styles before rendering, causing the flash effect you mentioned.

To prevent this issue, utilize Styled-JSX.

Styled-JSX ensures that the CSS renders on the server along with other content, resulting in instant loading. See an example in their documentation.

function HelloWorld() {
  return (
    <div>
      Hello world
      <p>scoped!</p>
      <style jsx>{`
        p {
          color: blue;
        }
        div {
          background: red;
        }
        @media (max-width: 600px) {
          div {
            background: blue;
          }
        }
      `}</style>
      <style global jsx>{`
        body {
          background: black;
        }
      `}</style>
    </div>
  )
}

export default HelloWorld

Answer 2

Next.JS documentation discusses the process of importing CSS states.

During production, all CSS files are automatically merged into a single minified .css file.

When using SSR, the markup is transmitted to the user's DOM, with a link tag pointing to your styles. The user must fetch and interpret the styles before rendering, causing the flash effect you mentioned.

To prevent this issue, utilize Styled-JSX.

Styled-JSX ensures that the CSS renders on the server along with other content, resulting in instant loading. See an example in their documentation.

function HelloWorld() {
  return (
    <div>
      Hello world
      <p>scoped!</p>
      <style jsx>{`
        p {
          color: blue;
        }
        div {
          background: red;
        }
        @media (max-width: 600px) {
          div {
            background: blue;
          }
        }
      `}</style>
      <style global jsx>{`
        body {
          background: black;
        }
      `}</style>
    </div>
  )
}

export default HelloWorld

Answer 3

Answer №2

In my current setup with Next.js 13, I have shifted from using the pages/ directory to working exclusively within the /app directory. While server-side rendering (SSR) is functioning perfectly, there has been an issue with styling. Interestingly, removing the "use client"; line resolves all other issues except for styles. I have recently added the styles to the root layout located at: /app/(pages)/layout.tsx. The presence of (pages) in the path structure does not seem to be causing any problems, as it is simply used for organizing folders.

Solution

// snippet from 'next.config.js'
const path = require('path');

module.exports = {
  sassOptions: {
    includePaths: [path.join(__dirname, 'src/styles')],
  },
};

Previously, I had included the `styles` folder instead of correctly pointing to the `src` directory.

The key lesson learned here is that before SSR ("use client"), incorrect directory pointers were still functional.

It was quite challenging to identify this issue, as I initially thought SSR/CSR paths would not play a significant role. However, delving into the code abstraction revealed its importance.

In the long run, it is essential to read and comprehend the code of the packages utilized in a project. This practice enhances coding style and fosters efficient utilization of the packages.

Enhances your coding abilities by witnessing diverse problem-solving techniques worldwide
Facilitates more precise and efficient usage of packages

If anyone is encountering difficulties with applying styles such as .css or .scss/.sass, feel free to reach out for further assistance. Your feedback is valued. Thank you.

https://beta.nextjs.org/docs/styling/sass

Answer 4

In my current setup with Next.js 13, I have shifted from using the pages/ directory to working exclusively within the /app directory. While server-side rendering (SSR) is functioning perfectly, there has been an issue with styling. Interestingly, removing the "use client"; line resolves all other issues except for styles. I have recently added the styles to the root layout located at: /app/(pages)/layout.tsx. The presence of (pages) in the path structure does not seem to be causing any problems, as it is simply used for organizing folders.

Solution

// snippet from 'next.config.js'
const path = require('path');

module.exports = {
  sassOptions: {
    includePaths: [path.join(__dirname, 'src/styles')],
  },
};

Previously, I had included the `styles` folder instead of correctly pointing to the `src` directory.

The key lesson learned here is that before SSR ("use client"), incorrect directory pointers were still functional.

It was quite challenging to identify this issue, as I initially thought SSR/CSR paths would not play a significant role. However, delving into the code abstraction revealed its importance.

In the long run, it is essential to read and comprehend the code of the packages utilized in a project. This practice enhances coding style and fosters efficient utilization of the packages.

Enhances your coding abilities by witnessing diverse problem-solving techniques worldwide
Facilitates more precise and efficient usage of packages

If anyone is encountering difficulties with applying styles such as .css or .scss/.sass, feel free to reach out for further assistance. Your feedback is valued. Thank you.

https://beta.nextjs.org/docs/styling/sass

Answer 5

Answer №3

If you're working with the _app.jsx (or .tsx) file in the pages/ directory, and you're trying to load CSS, keep in mind that it will always be Client-Side Rendered (CSR), not Server-Side Rendered (SSR).

To enable SSR, you need to wrap your Component with a SSRProvider within the pages/ directory.

One popular library for this is from the Adobe team, which you can find here:

Incorporate it like this:

import {SSRProvider, useIsSSR} from 'react-aria'
import type { AppProps } from 'next/app'

import '../styles/antd.css'
import '../styles/globals.css'

function MyApp({ Component, pageProps }: AppProps) {
  return (
    <SSRProvider> 
      <Component {...pageProps} /> 
    </SSRProvider>
  )
}

export default MyApp

In my opinion, the app/ directory is quite reliable. Unless you're working on a critical project with zero downtime requirements affecting thousands of users, consider the switch carefully. Adequate testing can ensure reliability.

For example, using the useIsSSR() hook for testing/debugging purposes:

useOnServer.ts (hook)

import { useIsSSR } from "@react-aria/ssr";

export default function useOnServer() {
  const isServer = useIsSSR();

  console.log(isServer ? "Server" : "Client");
}

This will provide appropriate console.log outputs for both server and client environments, demonstrating isomorphic code capabilities across both sides.

Answer 6

If you're working with the _app.jsx (or .tsx) file in the pages/ directory, and you're trying to load CSS, keep in mind that it will always be Client-Side Rendered (CSR), not Server-Side Rendered (SSR).

To enable SSR, you need to wrap your Component with a SSRProvider within the pages/ directory.

One popular library for this is from the Adobe team, which you can find here:

Incorporate it like this:

import {SSRProvider, useIsSSR} from 'react-aria'
import type { AppProps } from 'next/app'

import '../styles/antd.css'
import '../styles/globals.css'

function MyApp({ Component, pageProps }: AppProps) {
  return (
    <SSRProvider> 
      <Component {...pageProps} /> 
    </SSRProvider>
  )
}

export default MyApp

In my opinion, the app/ directory is quite reliable. Unless you're working on a critical project with zero downtime requirements affecting thousands of users, consider the switch carefully. Adequate testing can ensure reliability.

For example, using the useIsSSR() hook for testing/debugging purposes:

useOnServer.ts (hook)

import { useIsSSR } from "@react-aria/ssr";

export default function useOnServer() {
  const isServer = useIsSSR();

  console.log(isServer ? "Server" : "Client");
}

This will provide appropriate console.log outputs for both server and client environments, demonstrating isomorphic code capabilities across both sides.

Implementing CSS injection on a Next.js page during server-side rendering - tips and tricks!

Answer №1

To prevent this issue, utilize Styled-JSX.

Answer №2

Answer №3

Similar questions

Can markers be positioned on top of scroll bars?

What is the method for determining the numerical worth of the px containers?

Styled-components is not recognizing the prop `isActive` on a DOM element in React

Incorporate text into the URL of the image

Clicking on components that are stacked on top of each

Alternate Row Colors Using Odd/Even CSS Styling for Main Headings

In JavaScript, the function yields a proxy rather than an object

Delivery Guy: Error: JSON parsing issue on line 1 – Unexpected number detected

Develop a CSS layout for the specified design

Transitioning to EM-Based Media Queries

Textfield style in Struts2 customization

Arranging List Items within a Container

Flexbox: The final element is not positioned on the right side

Unable to choose fields and options within the popup box

Hover or click on HTML input type using CSS in your webpage

The script tag in Next.js is not functioning properly, as it is throwing a ReferenceError stating that "

Dynamic collapsible containers

Connecting CSS Style Sheet to JSP Page

What is the best way to eliminate a CSS style from a div?

Angular's table data display feature is unfortunately lacking