如何将 rxjs 运算符应用于从 angularfire2 获得的数据 [英] How to apply rxjs operator to data got from angularfire2

问题描述

假设我像这样在 angularfire2 中请求数据:

Suppose I requested for data in angularfire2 like this:

var ref = new Firebase("firebase url");

现在如何将 rxjs 运算符(如 map 运算符)应用于即将到来的数据

Now how can I apply rxjs operator like map operator to the data coming

推荐答案

我不认为你在看 angularfire2 - 那是 v1 代码...

I don't think you are looking at angularfire2 there - that's v1 code...

您可以在 angularfire2 中使用 rxjs 运算符 - 数据作为 Observable(FirebaseListObservable 或 FirebaseObjectObservable)返回 - 因此您可以导入任何 rxjs 运算符并将其应用于那些......

You can use the rxjs operators in angularfire2 - the data is returned as an Observable (FirebaseListObservable or FirebaseObjectObservable) - so you can import and apply any of the rxjs operators to those...

通常，您只需将数据分配给变量并让模板使用异步管道处理它

In general, you just assign the data to a variable and have the template handle it with the async pipe

@Component({
  selector: 'app',
  templateUrl: `
  <ul>
    <li *ngFor="let item of items | async">
      {{ item.name }}
    </li>
  </ul>
  `,
})
class AppComponent {
  items: FirebaseListObservable<any>;
  constructor(af: AngularFire) {
    this.items = af.database.list('/items');
  }
}

但是你可以使用 rxjs 操作符(一定要导入你想要的)

But you can use the rxjs operators (be sure to import what you want)

this.af.database.list('/items')
.map(value => {
    console.log(value);
    return value; // do something with value etc.
})
.subscribe(data => console.log(data));

更多信息:AngularFire2

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