JAVASCRIPT

react multiple classnames

className={[this.state.className, this.props.content.divClassName].join(" ")}

react multiple classname

<div className={`${styles.description} ${styles.yellow}`}>Multiple className</div>

How to add multiple classes to a ReactJS Component

var liClasses = classNames({
      'main-class': true,
      'activeClass': self.state.focused === index
    });

    return (<li className={liClasses}>{data.name}</li>);

add 2 class names react

...
    var liClasses = classNames({
      'main-class': true,
      'activeClass': self.state.focused === index
    });

    return (<li className={liClasses}>{data.name}</li>);
...

add 2 class names react

<input className={`form-control round-lg ${this.state.valid ? '' : 'error'}`} />