생명주기 componentWillReceiveProps

 

    change_list(list){

        this.setState({

            datalist:list,

            selectedItem:list[0]

        })

    }

 

    componentWillReceiveProps(nextProps) {

        // this.props 는 아직 바뀌지 않은 상태

        console.log("componentWillReceiveProps!!!!!!!!!!!!!!!!!!!")

        if(this.state.datalist[0].value != nextProps.items[0].value){

            console.log("새로운 리스트 !")

            this.change_list(nextProps.items)

        }else{

            console.log("기존 리스트 !")

        }

    }