Angular 2打字稿調用void方法，等待該方法執行完成，然后再執行下一步

Question

我們需要在T​​ypescript中調用返回類型為void的方法，但是在void方法執行完成之前，類型腳本不應繼續下一行代碼。 我們如何實現這一目標。

在下面的示例中，我們必須從closeWindow調用saveEventDetails，但是在關閉的窗口中var win = window.open（“ about：blank”，“ _self”）; win.close（）; 在saveEventDetails方法執行完成之前不應執行。

EX： -

 saveEventDetails(buttonClick: string = "") {        
        this.eventForm.markAsUntouched(false);
        this.eventForm.value.claimNumber = this.appContext.claimNumber;
        this.eventsService.patch(this.eventForm.value).subscribe(res => {
            this.loadUserTrackingDetails();
            this.userTrackingService.saveUserTrackingDetails(this.userTrackingModel).subscribe(r => {
                if (buttonClick == "") {
                    this.showSuccess();
                }
                return Observable.of();
            });
        }, (errResp: any) => {
        this.errorMessage = "Unable to load EVENT, invalid user or claim number";
            return Observable.of();
        });
    }




    closeWindow() {
        this.eventForm.value.cmResidentStateLicensed = false;
        Observable.create((observer: Observer<any>) => {
            this.saveEventDetails("popup")
            var v = true;
        })            
            .subscribe(data => {                
                var win = window.open("about:blank", "_self");
                win.close();
            },
            (errResp: any) => {
                this.errorMessage = "Unable to Save EVENT, Please try after soemtime";
            });      



    }

Answer 1

為什么不訂閱saveEventDetails（）返回的Observable呢？

closeWindow() {
    this.eventForm.value.cmResidentStateLicensed = false;
    this.saveEventDetails("popup").subscribe(data => {                
        var v = true;
        var win = window.open("about:blank", "_self");
        win.close();
    },
    (errResp: any) => {
        this.errorMessage = "Unable to Save EVENT, Please try after soemtime";
    });      
}