ClassName styles not working in react

Question

I'm having a little issue with styling react components. I have my scss stylesheets in a separate file and importing them into my react file. My scss stylsheet looks like this:

.testStyle {
  font-family: avenir;
  color: blue;
}

My react file, looks like this:

import React from 'react'

import styles from '../styles/main.scss'

class Temp extends React.Component {
  render() {
    return (
      **<div className={styles.testStyle}>**
        <h1>Hello</h1>
      </div>
    )
  }
}

export default Temp

With this setup, my styles are not passed through, however, if it works if I replace the starred line with <div className='testStyle'> , so it seems like the styles are being imported correctly. Can anyone help with this? Thanks.

Answer 1

I assume you are using css loader in your webpack. You need to enable modules:true

{
  loader: 'css-loader',
  options: { 
    modules: true
  }
}

If you don't want this behaviour to be default, in your (s)css you can use:

// sCSS
:local .yourClass {...}

// JS

import cls from '../yourCss.scss'

const Component = () => (
  <div className={cls.yourClass} />
)

// yourClass will become some random hash
// or something else based on your css loader config

to have it processed. If you have modules: true and you don't want css loader to compile your class, you can use

// CSS
:global .yourGlobalClass {...}

// JS
import '../yourCss.scss'

const Component = () => (
  <div className="yourGlobalClass" />
)

See the documentation: https://github.com/webpack-contrib/css-loader and https://github.com/css-modules/css-modules

Answer 2

Try to rename the .scss filename extension to .module.scss

If there's a problem in the sass-loader or you didn't configure it to support .scss files - it's original scss format will support only the .module.scss extension.

I had the same problem and it fixed my issue.

You can also check here the question I've asked of it.

Answer 3

Importing a stylesheet will simply tell Webpack or other build tools to process that stylesheet and include it in the output files. It does not, as far as I know, allow you to template JSX with it. So just by importing it your styles will be available after a build cycle takes place. You don't need to actually use it in any way.

className takes a string and directly translates to html class - so use it like that.

Answer 4

You might have the sass-loader missing in your webpack configuration. For that please check here ,

My recommendation is to drop sass and use postcss , it's extensive and works the way your are using classes in your code above.

For a postcss install and config check here

Answer 5

/* loginScreen.js */

import React, { Component } from 'react';
import './styles.css'

class loginScreen extends Component {
  render() {
    return (
      <div className={ 'form' }>

      </div>
    );
  }
}

export default loginScreen;

Answer 6

尝试这个：

import * as styles from '../styles/main.scss'

Answer 7

This, I believe, might be related to the fact that some Webpack configs are "hash'ing" the classes, therefore your code should perhaps look like this:

import React from 'react'

import * as  styles from '../styles/main.scss'

const selectors = styles as any;

class Temp extends React.Component {
  render() {
    return (
      **<div className={selectors.testStyle}>**
        <h1>Hello</h1>
      </div>
    )
  }
}

See if this helps.