MaterialUI makeStyles undoes custom css upon refresh in NextJS

问题

I am working on a NextJS site that has some custom styling that is being applied via MaterialUI's makeStyles. It works fine on the first load and then undoes all of the custom work on the second. It seems that it has something to do with the route as the only time that it works is when I first am directed to the page itself. It is happening on 2 different pages one is being directed via href='/login'and the other is being directed via next/router router.push('/register')

I am assuming that this has to do with the way that Next loads the page? But I will say that both of these are prerendered pages according to the icon at the bottom right.

import React, {useState} from 'react';
import { connect } from 'react-redux'
import { bindActionCreators } from 'redux'
import { login } from '../store/user/action'
import { useRouter } from 'next/router'

import TextField from '@material-ui/core/TextField';
import { makeStyles } from '@material-ui/core/styles';

const style = makeStyles({
    root: {
        marginBottom: '20px',
        textAlign: 'center'
    },
  });


function Signin({login}) {
    const [email, setEmail] = useState('');
    const [password, setPassword] = useState('');
    
    const router = useRouter();

    const clickRegister = (e) => {
        e.preventDefault();
        router.push('/register')
    }

    const classStyle = style();

    return (
        <div className='flex flex-column center m-20 w-750'>
            <h3 className='m-20'>Login</h3>
            <form className='flex flex-column w-750 center' onSubmit={e=>login(e, {email, password})} >
                <TextField
                    className={classStyle.root}
                    required
                    type='email'
                    id="email"
                    label="Email"
                    variant="outlined"
                    onChange={e=>setEmail(e.target.value)}
                />
                <TextField
                    className={classStyle.root}
                    required
                    type='password'
                    id="password"
                    label="Password"
                    variant="outlined"
                    onChange={e=>setPassword(e.target.value)}
                />
                
                <input 
                    type='submit'
                    className='purple-button mt-20 h-3' 
                    onClick={e=>login(e)}
                    value='Login' />
            </form>
            <p>Don't Have an account?</p>
            <form onSubmit='/register'>
                <input value='Register' type='submit' className='flex flex-column w-750 center purple-button h-3' onClick={e=>clickRegister(e)} />
            </form>

        </div>
    )
}



const mapStateToProps = (state) => ({
    email: state.user.email,
    token: state.user.token,
    isLoggedIn: state.user.isLoggedIn,
  })
  
const mapDispatchToProps = (dispatch) => {
    return {
        login: bindActionCreators(login, dispatch),
    }
}
  
export default connect(mapStateToProps, mapDispatchToProps)(Signin)

"dependencies": {
    "@material-ui/core": "4.11.3",
    "axios": "0.21.1",
    "material-ui": "0.20.2",
    "next": "9.4.1",
    "next-redux-wrapper": "^6.0.1",
    "react": "^16.12.0",
    "react-dom": "^16.12.0",
    "react-redux": "7.1.3",
    "redux": "4.0.5",
    "redux-devtools-extension": "2.13.8",
    "redux-thunk": "2.3.0"
  },

回答1:

You need additional setup for Material-UI stylesheets in pages/_document.js to support SSR styling.

If you don't have a custom _document.js yet, create one with the following code:

import React from "react";
import Document, { Html, Head, Main, NextScript } from "next/document";
import { ServerStyleSheets } from "@material-ui/core/styles";

class MyDocument extends Document {
  static async getInitialProps(ctx) {
    const sheets = new ServerStyleSheets();
    const originalRenderPage = ctx.renderPage;

    ctx.renderPage = () =>
      originalRenderPage({
        enhanceApp: (App) => (props) => sheets.collect(<App {...props} />)
      });

    const initialProps = await Document.getInitialProps(ctx);

    return {
      ...initialProps,
      // Styles fragment is rendered after the app and page rendering finish.
      styles: [
        ...React.Children.toArray(initialProps.styles),
        sheets.getStyleElement()
      ]
    };
  }

  render() {
    return (
      <Html lang="en">
        <Head />
        <body>
          <Main />
          <NextScript />
        </body>
      </Html>
    );
  }
}

export default MyDocument;

For further details check Material-UI official documentation.

来源：https://stackoverflow.com/questions/66089290/materialui-makestyles-undoes-custom-css-upon-refresh-in-nextjs