react 点击空白处隐藏弹出层

class Select extends Component {
    constructor(props) {
        super(props);

        this.state = {
            selected: props.list[0],
            showList: false
        };

        this.showList = this.showList.bind(this);
    }

    componentDidMount() {
        // 在 document 上绑定点击事件，隐藏弹出层
        document.addEventListener(‘click‘, (e) => {
            this.setState({
                showList: false
            });
        });
    }

    showList(e) {
        // 使用 react 的 e.stopPropagation 不能阻止冒泡，需要使用 e.nativeEvent.stopImmediatePropagation，这里我们对其进行封装，方便多次调用
        this.stopPropagation(e);
        this.setState({
            showList: !this.state.showList
        });
    }

    selectList(i) {
        const selected = this.props.list[i];
        this.setState({
            selected: selected,
            showList: false
        });
        this.props.onChange(selected);
    }

    // 封装后的阻止冒泡功能
    stopPropagation(e) {
        e.nativeEvent.stopImmediatePropagation();
    }

    render() {
        const { list } = this.props;
        const { selected, showList } = this.state;
        return (
            <div className="hp-select">
                <span className="hp-select__text">{selected.text}</span>
                <span className="hp-select__btn" onClick={this.showList}></span>
                <div
                    className="hp-select__list"
                    style={{ display: showList ? ‘block‘ : ‘none‘ }}
                    // 方便的调用封装冒泡功能来阻止冒泡
                    onClick={this.stopPropagation}
                >
                    <ul>
                        {
                            list && list.map((item, i) => {
                                return <li key={item.value} onClick={this.selectList.bind(this, i)}>{item.text}</li>;
                            })
                        }
                    </ul>
                </div>
            </div>
        );
    }
}