React Body ClassName

Provides a declarative way to specify document.body.className in a single-page app.
This component can be used on server side as well.

Built with React Side Effect.

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Installation

npm install --save react-body-classname

Dependencies: React >= 0.13.0

Features

• Does not emit DOM, not even a <noscript>;
• Like a normal React compoment, can use its parent's props and state;
• Can be defined in many places throughout the application;
• Supports arbitrary levels of nesting, combining each className;
• Works just as well with isomorphic apps.

Example

class SomeComponent {
  render() {
    // This will add 'home' to the body
    return (
      <BodyClassName className='home'>
        <h1>Home, sweet home.</h1>
      </BodyClassName>
    );
  }
}

class App {
  render() {
    // This will add 'app' to the body
    return (
      <BodyClassName className='app'>
        <SomeComponent/>
      </BodyClassName>
    );
    // Becuase we nested the component, our body will now have 'app home'
    // as the class name
  }
}

Use CSS modules with webpack or similar?

import styles from './some.css';

class Thing {
  render() {
    return (
      <BodyClassName className={styles.body}>
        <h1>CSS modules rock!</h1>
      </BodyClassName>
    );
  }
}

Server Usage

If you use it on server, call BodyClassName.rewind() after rendering components to string to retrieve the combined class name. You can then embed this className into HTML page template.

Because this component keeps track of mounted instances, you have to make sure to call rewind on server, or you'll get a memory leak.