Angular 组件和非 Angular 组件之间的通信：从来自回调的可观察对象返回数据

Question

我有一个应用程序要求我为某些事情使用非 Angular JavaScript。为了在 Angular 组件中触发一个动作，我将一个回调传递给非 Angular 组件。触发回调时，可观察对象会在 Angular 组件上运行（执行 http 调用）。这行得通，但我遇到的唯一难题是以某种方式从该可观察对象返回的数据传递回非 Angular 组件。我的实际应用程序相当复杂，因此我创建了一个简化得多的Stackblitz版本，以便更容易看到我在做什么。

这对我来说很棘手，因为GET调用doStuff是异步的，所以我不能只返回结果。我对如何在纯 Angular 应用程序中解决这个问题有一些想法......但我不确定在 Angular 组件和非 Angular 组件之间共享数据时如何实现这一点。

应用程序组件.ts：

 export class AppComponent  {

  constructor(private http: HttpClient){}

  doStuff() {

    let randomNum = this.getRandomInt(2); // Simulate different http responses

    this.http.get<any>(`https://jsonplaceholder.typicode.com/todos/${randomNum}`).subscribe(x => {

      if (x === 1) {

        // Here is where I want to share data with the non-Angular component

        console.log(x.id);

      } else {

        // Here is where I want to share data with the non-Angular component

        console.log(x.id);

      }

    });

  }

  ngOnInit() {

   var x = new NonAngularComponent(this.doStuff.bind(this));

  }

  private getRandomInt(max) {

    return Math.floor(Math.random() * Math.floor(max)) + 1;

  }

}

非角度组件.ts：

export class NonAngularComponent {

  constructor(private onSave: () => void) {

    this.init()

  }

  init() {

    const newElement = document.createElement('button');

    newElement.innerHTML = 'Click';

    newElement.addEventListener('click', () => {

      this.onSave(); // Works, but now I need to do something with the results of doStuff()

    });

    document.getElementById('foo').append(newElement);

  }

}

任何建议将不胜感激。

Answer 1

如果您想在 Angular 组件中产生一些副作用，最好Observable从您的doStuff()方法返回并使用运算符：tapdoStuff() {&nbsp; let randomNum = this.getRandomInt(2);&nbsp; return this.http.get<any>(`https://jsonplaceholder.typicode.com/todos/${randomNum}`).pipe(tap(x => {&nbsp; &nbsp; if (x === 1) {&nbsp; &nbsp; &nbsp; // Here is where I want to share data with the non-Angular component&nbsp; &nbsp; &nbsp; console.log(x.id);&nbsp; &nbsp; } else {&nbsp; &nbsp; &nbsp; // Here is where I want to share data with the non-Angular component&nbsp; &nbsp; &nbsp; console.log(x.id);&nbsp; &nbsp; }&nbsp; }));}非角度.component.tsnewElement.addEventListener('click', () => {&nbsp; this.onSave().subscribe(res => {&nbsp; &nbsp; // do whatever you want&nbsp; });});分叉的 Stackblitz

Answer 2

我认为最简单的解决方案是在 AppComponent 中简单地拥有一个 NonAngularComponent 实例this.nonAngularComponent = new NonAngularComponent(this.doStuff.bind(this));在回调中，只需从 NonAngularComponent 中调用您想要的方法，如下所示：doStuff() {&nbsp; &nbsp; let randomNum = this.getRandomInt(2);&nbsp; &nbsp; this.http&nbsp; &nbsp; &nbsp; .get<any>(`https://jsonplaceholder.typicode.com/todos/${randomNum}`)&nbsp; &nbsp; &nbsp; .subscribe(x => {&nbsp; &nbsp; &nbsp; &nbsp; if (x === 1) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; // Here is where I want to share data with the non-Angular component&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; // console.log(x.id);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; this.nonAngularComponent.doSomething(x);&nbsp; &nbsp; &nbsp; &nbsp; } else {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; // Here is where I want to share data with the non-Angular component&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; // console.log(x.id);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; this.nonAngularComponent.doSomething(x);&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; });&nbsp; }doSomething方法：&nbsp; public doSomething(result) {&nbsp; &nbsp; console.log("Non-Angular component received result", result);&nbsp; }和控制台输出：