How to use Theme in material UI with React + Next.js?

user_13000229 0
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I created three files shown below.

The color of Paper changes according to the value of palette.type defined in theme.js.

Page with palette.type: 'dark'

Page with palette.type: 'dark'

Page with palette.type: 'light'

Page with palette.type: 'light'

However, I don't understand how the variable theme works. I added two console.log(theme) to index.js. Both shows palette.type: 'light' regardless of the value in theme.js.

Result of console.log

Result of console.log

How can I pass theme to index.js (without importing theme)?

components/Layout.js - Shared component to apply the same layout to all pages

import React from 'react';
import { MuiThemeProvider } from '@material-ui/core/styles';
import { theme } from '../utils/theme';


class Layout extends React.Component {
    render() {
        return(
            <MuiThemeProvider theme={theme}>
                {this.props.children}
            </MuiThemeProvider>
        )
    }
}

export default Layout;

pages/index.js - One specific page

import Layout from '../components/Layout';
import { makeStyles, createStyles, useTheme, Paper } from '@material-ui/core';

const useStyles = makeStyles(theme => {
    console.log('inside makeStyles');
    console.log(theme);
    return createStyles({
        container: {
            margin: '5px 5px 50px 5px'
        }
    })
});

export default function Index(props) {
    const classes = useStyles(props);
    const theme = useTheme();
    console.log('inside Index')
    console.log(theme);

    return(
        <Layout>
            <h2>About</h2>
            <Paper className={classes.container}>
                <p>Sample test</p>
            </Paper>
            <Paper className={classes.container}>
                <p>Sample test2</p>
            </Paper>
        </Layout>
    )
};

utils/theme.js - Separate file to write theme

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

export const theme = createMuiTheme({
    palette: {
        type: 'dark'
    }
});
material-design material-ui next.js reactjs
1 Answers

Try to move <MuiThemeProvider theme={theme}> from Layout.js to _app.js.

_app.js

import React from 'react';
import PropTypes from 'prop-types';
import Head from 'next/head';
import { ThemeProvider } from '@material-ui/core/styles';
import CssBaseline from '@material-ui/core/CssBaseline';
import theme from '../src/theme';

export default function MyApp(props) {
const { Component, pageProps } = props;

React.useEffect(() => {
    // Remove the server-side injected CSS.
    const jssStyles = document.querySelector('#jss-server-side');
    if (jssStyles) {
        jssStyles.parentElement.removeChild(jssStyles);
    }
}, []);

return (
    <React.Fragment>
    <Head>
        <title>My page</title>
        <meta name="viewport" content="minimum-scale=1, initial-scale=1, width=device-width" />
    </Head>
    <ThemeProvider theme={theme}>
        {/* CssBaseline kickstart an elegant, consistent, and simple baseline to build upon. */}
        <CssBaseline />
        <Component {...pageProps} />
    </ThemeProvider>
    </React.Fragment>
);
}

MyApp.propTypes = {
    Component: PropTypes.func.isRequired,
    pageProps: PropTypes.object.isRequired,
};

Theme should apply to all components and you should see dark in the console.log() print.

Official Material-UI + Next.js example

If all pages share the same layout you can remove Layout component completely.

user_59640230
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