从订阅打字稿返回值 [英] Returning value from subscription typescript

问题描述

如何从Save()方法返回成功.

public SaveItem() {
 if(save()){ // The goal is to use save method like this
  // Close pop up;
}

public SaveAndNew() {
 if(save()){  // The goal is to use save method like this
  // Create new item;
}


private save() {
 let issuccess = false;

 this.myservice.AddParty(newUserObject)
  .subscribe(data => {   
    if (data['status'].toString() === '1') {
      return issuccess = false;
    } else {
      return issuccess = true;
    }
  },
    (er) => {

      return issuccess = false;
    });
}

• 如果我有save(): boolean，则会抛出错误，即Must return a value如果在订阅之外返回issuccess，则将始终返回错误值.
• If i have save(): boolean it will throw error that Must return a value if return issuccess outside the subscribe it will always return a false value.

我将如何等待保存功能并根据响应返回特定值?

我已经阅读了有关回调的内容，但它似乎并不优雅，是否有任何优雅的方法可以做到这一点

callbacks-vs- promises-vs-rxjs-vs-async-awaits

如果它是C#，我会这样做

If its a C# i would do this

var isSuccess = await SaveAsync(party);

推荐答案

您可以使save方法返回可观察到的布尔值

you can make your save method return an observable of boolean value

public SaveAndNew() {

this.save().subscribe(success =>
{
    if(success)
    {
      // Create new item;
    }
});

private save() : Observable<boolean> {

 return this.myservice
            .AddParty(newUserObject)
            .map(data=> data['status'].toString() === '1')
            .catch(err => Observable.of(false)); 
}

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