loading-container-implementation.jsx

// LoadingContainer.js

class LoadingContainer extends React.Component {
  render() {
    if (this.props.loading) {
      return (
        <div>
          Loading...
        </div>
      );
    } else if (this.props.error !== null) {
      return (
        <div className="alert alert-danger" role="alert">
          <span className="glyphicon glyphicon-exclamation-sign" aria-hidden="true"></span>
          {this.props.error}
        </div>
      );
    } else {
      return (
        <div>
          {this.props.children}
        </div>
      );
    }
  }
}