javascript - Angular2 - 当两个事件发射器发出时订阅

Question

我的组件有以下代码:

ngOnInit() {
    this.route.params.forEach((params: Params) => {
        this.codvis = params['id'];
    });
    this.objects.selectedObject.subscribe(obj => this.selectedEventObjet(obj));
    this.sections.selectecSection.subscribe(section => this.selectedEventSection(section));
}

function selectedEventObjet(o) {
    this.selectedObj = o;
}

function selectedEventSection(s) {
    this.selectedSection = s;
}

所以，现在我只想在设置 selectedObj 和 selectedSection 时调用服务，但它不仅仅是简单的:

ngOnInit() {
    this.route.params.forEach((params: Params) => {
        this.codvis = params['id'];
    });
    this.objects.selectedObject.subscribe(obj => this.selectedEventObjet(obj));
    this.sections.selectecSection.subscribe(section => this.selectedEventSection(section));
    this.myService.getItems(this.selectedObj, this.selectedSection)
        .subscribe(
            items => this.items = items;
        );
}

但是我无法获取元素。

如何确保 selectedObj 和 selectedSection 设置为获取 items？

Answer 1

Observable.combineLatest(this.objects.selectedObject, this.sections.selectecSection)
  .subscribe(([obj, section]) =>  this.myService.getItems(obj, section))

您甚至不需要本地处理程序来保留该值，只需直接获取序列即可。