Creating React components with scoped CSS imports

Question

Creating React components with scoped CSS imports

I am facing an issue with my component's CSS structure and import method.

About/style.css

.AboutContainer {
    # Some style
}

p > code {
    # Some style
}

When importing the CSS in the component:

About/index.js

import './style.css';

export default class About extends Component {
    render() {
         # Return some component
    }
}

The problem is that the CSS is being imported globally in the <header> section.

I expected the CSS to be:

Scoped to the component so that it only applies to elements rendered within this specific component.
Disappearing when the component is unmounted.

However, upon inspection, I found that the styles are specified in the <header> section and applied to all components.

<header>
   // Stuff
   <style type="text/css">style for component About</style>
   <style type="text/css">style for component B</style>
   <style type="text/css">style for component C</style>
   // Stuff
</header>

How can I import CSS to be scoped to the component? It seems like I may not fully understand how CSS imports work in React ES6.

I initially followed this tutorial

Edit

Brett's response was helpful, but it turns out that my issue lies elsewhere. I created my app using create-react-app, which simplifies the initial setup for React projects by including WebPack, Babel, and other tools. The default WebPack configuration did not enable the module option for the css-loader, causing local scoping to be disabled.

For those seeking additional information, it appears that create-react-app does not provide a straightforward way to customize the WebPack config, but there are various workarounds available online.

css reactjs

Answer 1

Answer №1

If you're looking for a way to scope your CSS styles locally, consider using tools like CSS Modules or other CSS-in-JS packages like Emotion, Styled Components, and more options available here.

CSS Modules provide scoping for all class names and animation names within the CSS file by default. URLs (url(...)) and @imports follow module request format with relative paths (./xxx and ../xxx), and modules folder paths (xxx and xxx/yyy).

Here's an example implementation in React:

Consider a React component:

import React from 'react';
import styles from './styles/button.css';

class Button extends React.Component {
  render() {
    return (
      <button className={styles.button}>
        Click Me
      </button>
    );
  }
}
export default Button;

With corresponding CSS in ./styles/button.css:

.button {
  border-radius: 3px;
  background-color: green;
  color: white;
}

After using CSS Modules, the generated CSS output might look like this:

.button_3GjDE {
  border-radius: 3px;
  background-color: green;
  color: white;
}

The random hash at the end of the class name ensures uniqueness.

An Alternative Approach

To simplify styling and prevent conflicts, consider avoiding generic selectors and adopting class-based naming conventions like BEM. For instance:

.aboutContainer {
  # Some style
}

.aboutContainer__code {
  # Some style
}

This approach assigns unique class names to elements that need styling.

Answer 2

If you're looking for a way to scope your CSS styles locally, consider using tools like CSS Modules or other CSS-in-JS packages like Emotion, Styled Components, and more options available here.

CSS Modules provide scoping for all class names and animation names within the CSS file by default. URLs (url(...)) and @imports follow module request format with relative paths (./xxx and ../xxx), and modules folder paths (xxx and xxx/yyy).

Here's an example implementation in React:

Consider a React component:

import React from 'react';
import styles from './styles/button.css';

class Button extends React.Component {
  render() {
    return (
      <button className={styles.button}>
        Click Me
      </button>
    );
  }
}
export default Button;

With corresponding CSS in ./styles/button.css:

.button {
  border-radius: 3px;
  background-color: green;
  color: white;
}

After using CSS Modules, the generated CSS output might look like this:

.button_3GjDE {
  border-radius: 3px;
  background-color: green;
  color: white;
}

The random hash at the end of the class name ensures uniqueness.

An Alternative Approach

To simplify styling and prevent conflicts, consider avoiding generic selectors and adopting class-based naming conventions like BEM. For instance:

.aboutContainer {
  # Some style
}

.aboutContainer__code {
  # Some style
}

This approach assigns unique class names to elements that need styling.

Answer 3

Answer №2

If you're looking for a solution, perhaps checking out react-scoped-css could be beneficial. By the way, I have created this library. Feel free to report any issues or submit a pull request if you come across any bugs or have suggestions for improvement.

Answer 4

If you're looking for a solution, perhaps checking out react-scoped-css could be beneficial. By the way, I have created this library. Feel free to report any issues or submit a pull request if you come across any bugs or have suggestions for improvement.

Answer 5

Answer №3

Since you mentioned using create-react-app, the solution to your issue is quite simple - just change style.css to

style.module.css</code. It should look something like this:</p>
<pre><code>import styles from "./style.module.css"
<button className={styles.button}>blabla</button>

For more information, check out this helpful article:

Answer 6

Since you mentioned using create-react-app, the solution to your issue is quite simple - just change style.css to

style.module.css</code. It should look something like this:</p>
<pre><code>import styles from "./style.module.css"
<button className={styles.button}>blabla</button>

For more information, check out this helpful article:

Answer 7

Answer №4

To achieve scoped CSS, you can leverage SASS (.scss).

For instance, if you want to utilize bootstrap in a single component to prevent any conflicts, you can encapsulate the component within

<div className='use-bootstrap'>

and then create a .scss file as follows:

.use-bootstrap {   
  // Place bootstrap.min.css content here
}

Answer 8

To achieve scoped CSS, you can leverage SASS (.scss).

For instance, if you want to utilize bootstrap in a single component to prevent any conflicts, you can encapsulate the component within

<div className='use-bootstrap'>

and then create a .scss file as follows:

.use-bootstrap {   
  // Place bootstrap.min.css content here
}

Answer 9

Answer №5

When saving your CSS file, make sure to use the following naming convention: [name].module.css. For more information, please refer to the documentation at https://create-react-app.dev/docs/adding-a-sass-stylesheet

JSX File Example:

import React from 'react';
import styles from './MyPage.module.scss';

const MyPage = () => {
    return (
        <div className={styles.myDiv}>
            My Page
        </div>
    );
};

export default MyPage;

Styles File Example:

.myDiv {
    color: #f3f3f3;
    font-family: "Cambria";
    font-weight: normal;
    font-size: 2rem;
}

Answer 10

When saving your CSS file, make sure to use the following naming convention: [name].module.css. For more information, please refer to the documentation at https://create-react-app.dev/docs/adding-a-sass-stylesheet

JSX File Example:

import React from 'react';
import styles from './MyPage.module.scss';

const MyPage = () => {
    return (
        <div className={styles.myDiv}>
            My Page
        </div>
    );
};

export default MyPage;

Styles File Example:

.myDiv {
    color: #f3f3f3;
    font-family: "Cambria";
    font-weight: normal;
    font-size: 2rem;
}

Answer 11

Answer №6

To keep things simple (without resorting to using Css-modules or css-in-js), one solution is to append a suffix to your class selectors like so:

className="btn__suffix"

For example, if your component is named FileUpload.tsx, your suffix could be __fu, derived from the first character of each word in the component name (File and Upload).

This would result in:

import './style.css';

export default class About extends Component {
render() {
      Return (
         <div className="container__fu">
           ...
         </div>
              )
   }
}

Then, in your CSS file, you would have:

.container__fu {
   ...
}

Answer 12

To keep things simple (without resorting to using Css-modules or css-in-js), one solution is to append a suffix to your class selectors like so:

className="btn__suffix"

For example, if your component is named FileUpload.tsx, your suffix could be __fu, derived from the first character of each word in the component name (File and Upload).

This would result in:

import './style.css';

export default class About extends Component {
render() {
      Return (
         <div className="container__fu">
           ...
         </div>
              )
   }
}

Then, in your CSS file, you would have:

.container__fu {
   ...
}

Creating React components with scoped CSS imports

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

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