react bootstrap modal

var ModalFixMixin = {
    componentDidMount() {
        if (document && document.body) {
            var orig = document.body.className;
            document.body.className = orig + (orig ? ' ' : '') + 'modal-open';
        }
    },
    componentWillUnmount() {
        if (document && document.body) {
            document.body.className = document.body.className.replace(/ ?modal-open/, '');
        }
    }
};