React check clicked target is whether contained in a another node.

DataTableBody.jsx

handleOutSideClick(event) {
    const {onRowUnSelected} = this.props;

    const isDescendantOfRoot = ReactDOM.findDOMNode(this.tbody).contains(event.target);

    if (!isDescendantOfRoot) {
      event.stopPropagation();
      this.setState({
        selectedRowIndex: -1
      }, () => {
        onRowUnSelected && onRowUnSelected();
      });
    }
  }

  componentDidMount() {
    if (document.addEventListener) {
      document.addEventListener('click', this.handleOutSideClick, true);
    } else {
      document.attachEvent('onclick', this.handleOutSideClick);
    }
  }

  componentWillUnmount() {
    if (document.addEventListener) {
      document.addEventListener('click', this.handleOutSideClick, true);
    } else {
      document.attachEvent('onclick', this.handleOutSideClick);
    }
  }

判断点击的元素节点是否在指定的结点的内部.