Styling a CSS stylesheet specifically for the active component

Question

Styling a CSS stylesheet specifically for the active component

In the ReactJS app I am developing, there is a header at the top, a left menu, and a central "frame" where routes and their components load. I am seeking a solution to apply a CSS stylesheet specifically to certain components when they are loaded, without affecting the header or menu.

Initially, I tried adding import 'custom.css'; to individual components in order to only apply the styles when the route is active. However, this approach resulted in the stylesheet affecting the entire page, even when the component was not loaded.

One potential alternative is using styled components, but my project requires integrating an unchanged stylesheet provided by a design company solely for the submodule I am focused on, without impacting the rest of the application.

How can I ensure that a stylesheet is applied only to the active route or component?

css reactjs

Answer 1

Answer №1

Utilize a straightforward CSS approach. Imagine you have two components each with their own CSS files (let's call them about.css and contact.css). Both CSS files contain a common class with different style properties, for example:

about.css

.container{
    max-width: 400px;
}

contact.css

.container{
    max-width: 500px;
}

When using ReactJS, both CSS files will load simultaneously and may override one another's styles. To address this issue, add specific classes to distinguish between these styles, like so:

about.css

.about-component.container{
    max-width: 400px;
}

contact.css

.contact-component.container{
    max-width: 500px;
}

Answer 2

Utilize a straightforward CSS approach. Imagine you have two components each with their own CSS files (let's call them about.css and contact.css). Both CSS files contain a common class with different style properties, for example:

about.css

.container{
    max-width: 400px;
}

contact.css

.container{
    max-width: 500px;
}

When using ReactJS, both CSS files will load simultaneously and may override one another's styles. To address this issue, add specific classes to distinguish between these styles, like so:

about.css

.about-component.container{
    max-width: 400px;
}

contact.css

.contact-component.container{
    max-width: 500px;
}

Answer 3

Answer №2

To ensure that a specific action is only taken once the component has been mounted, you can make use of lifecycle methods. The following example assumes that you are working with sass, React, sass-node, and have the necessary loaders configured in webpack.

<pre>
import React from 'react';
import './styles.scss';

class MyComponent {
 constructor(props) {
   super(props);
   this.state = { className: '' }
 }

 componentDidMount() {
  this.setState({
    className: 'myOwnClass'
   });
  }
  render(){
    return (
    <div className={this.state.className}>This is an example</div>
   );
  }
}

export default myComponent;
</pre>

Answer 4

To ensure that a specific action is only taken once the component has been mounted, you can make use of lifecycle methods. The following example assumes that you are working with sass, React, sass-node, and have the necessary loaders configured in webpack.

<pre>
import React from 'react';
import './styles.scss';

class MyComponent {
 constructor(props) {
   super(props);
   this.state = { className: '' }
 }

 componentDidMount() {
  this.setState({
    className: 'myOwnClass'
   });
  }
  render(){
    return (
    <div className={this.state.className}>This is an example</div>
   );
  }
}

export default myComponent;
</pre>

Answer 5

Answer №3

If you want to selectively apply CSS styles when needed, consider using CSS Modules. It may be necessary to ensure your React version is up to date.

Save your CSS files with a ".module.css" extension, like "styles.module.css". The styles in these files are restricted to the components where they are imported, as explained in a tutorial by W3Schools.

For example, the CSS code in styles.module.css could look like:

.container {
  color: white;
}
.cont-child {
  background-color: red;
}

In your JS file, import the CSS file if it's in the same directory and specify the correct path:

import styles from './styles.module.css'

Then, in your HTML section, utilize the CSS classes like this:

class Home extends React.Component {
  render() {
    return(
      <main className={ styles.container } >
        <div className={ styles["cont-child"]} >
          Some div text about something...
        </div>
      </main>
    );
  }
}

I use both methods to access selectors because the styles variable behaves like an object. I included them both here as the second option can handle selectors named like "btn-active," which can be useful in certain scenarios. For further information, check out CSS Modules documentation.

Please remember: This answer was originally posted in response to a similar query on Stack Overflow - React CSS - how to apply CSS to specific pages only

Answer 6

If you want to selectively apply CSS styles when needed, consider using CSS Modules. It may be necessary to ensure your React version is up to date.

Save your CSS files with a ".module.css" extension, like "styles.module.css". The styles in these files are restricted to the components where they are imported, as explained in a tutorial by W3Schools.

For example, the CSS code in styles.module.css could look like:

.container {
  color: white;
}
.cont-child {
  background-color: red;
}

In your JS file, import the CSS file if it's in the same directory and specify the correct path:

import styles from './styles.module.css'

Then, in your HTML section, utilize the CSS classes like this:

class Home extends React.Component {
  render() {
    return(
      <main className={ styles.container } >
        <div className={ styles["cont-child"]} >
          Some div text about something...
        </div>
      </main>
    );
  }
}

I use both methods to access selectors because the styles variable behaves like an object. I included them both here as the second option can handle selectors named like "btn-active," which can be useful in certain scenarios. For further information, check out CSS Modules documentation.

Please remember: This answer was originally posted in response to a similar query on Stack Overflow - React CSS - how to apply CSS to specific pages only

Answer 7

Answer №4

I am interested in applying a CSS stylesheet to specific components only after they have been loaded.

Have you considered adding the styles inline with React.js?

Step 1. Create the style object for the component:

var componentOneStyle = {
  color: 'white',
  backgroundColor: 'red'
};

Step 2. Populate the component's style attribute with the style object:

ReactDOM.render(<div style={componentOneStyle}>This is Component One</div>, mountNode);

Answer 8

I am interested in applying a CSS stylesheet to specific components only after they have been loaded.

Have you considered adding the styles inline with React.js?

Step 1. Create the style object for the component:

var componentOneStyle = {
  color: 'white',
  backgroundColor: 'red'
};

Step 2. Populate the component's style attribute with the style object:

ReactDOM.render(<div style={componentOneStyle}>This is Component One</div>, mountNode);

Styling a CSS stylesheet specifically for the active component

Answer №1

Answer №2

Answer №3

Answer №4

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