Question

我有具有此功能的DBService typescript类

`initialiseDb(): Observable < any > {


let source = Observable.create((observer) =>
{}

    openRequest.onsuccess = (event: any) =>
    {
        console.log("Database open");
        this.localDb = event.target.result;
    }
    observer.next();
    observer.complete();
});
return source;

}

在ngOnInit上的app.component.ts

let dbInitObservable = this.localDb.initialiseDb().subscribe
        ((res => alert("Initilisation")), err => alert("Error"), () => this.authService.autoSignIn());

我需要在autoSignIn被调用并完成后仅在authService完成后致电initialiseDb。

任何想法？，没有语法错误，但this.authService.autoSignIn（）永远不会被调用。

的Ta。

Answer 1

你需要在传递给open()的回调中调用数据库Observable.create()，然后你需要监听数据库并发出正确的下一个错误并从监听器中完成。

initialiseDb(): Observable<any> {
  return Observable.create((observer) => {
    let openRequest = localDatabase.indexedDB.open(dbName);

    openRequest.onsuccess = (event: any) => {
      console.log("Database open");
      this.localDb = event.target.result;
      observer.next(this.localDb);
      observer.complete();
    }
    openRequest.onerror = (event: any) => {
      console.log("Database error: " + e.target.errorCode);
      observer.error(e.target.errorCode);
    }
  })
}

活跃的rxjs订阅未在完整

1 个答案: