将Angular应用程序与ReactJS应用程序连接？

Question

我有一个Angular应用程序，我想在ReactJS中编写应用程序的某些部分。

如何将ReactJS应用程序注入现有的Angular应用程序中？我还需要组件的双向通信。

Answer 1

您可能需要其他选项，所以我在第2段中编写了它：

• 无需通信的Angular-ReactJS
• 具有双向通信的Angular-ReactJS

下面的所有代码都是最少的，无法在提出的步骤中显示问题。在GitHub上，您拥有完整的代码来解决问题，以下示例并不总是1：1，因为此代码已扩展。

无需通信的Angular-ReactJS

要将ReactJS应用添加到现有的Angular应用中，您需要安装5个npm依赖项：react，react-dom：

npm install --save react
npm install --save react-dom
npm install --save-dev @types/react
npm install --save-dev @types/react-dom
npm install --save-dev @types/react-select

下一步-我们应该允许jsx在.tsx文件中使用模板，因此我们应该进行编辑tsconfig.json并添加：

{
    ...
   "compilerOptions": {
    …
    "jsx": "react"
}

如果使用WebStorm，则应重新启动项目，因为tslint会显示错误，直到重新启动。

为了保持结构清晰，我创建了以下目录结构：

angular /
  ng-hero.component.ts // Component in Angular
  react-renderer.component.ts // ReactJS renderer without communication
react /
  react-application.tsx // React init application
  react-hero.tsx // React hero component
app.component.html
app.component.ts

现在，您需要在Angular中创建特殊组件，该组件将负责嵌入ReactJS应用程序。我将调用此组件ReactRendererComponent。这个组件非常简单，它只有一行模板行，带有的构造函数import Injector和一行ngOnInit：

@Component({
  selector: 'app-react-renderer',
  template: `<div class="react-container" id="react-renderer"></div>`
})
export class ReactRendererComponent implements OnInit {
  constructor(public injector: Injector) { }

  ngOnInit() {
    ReactApplication.initialize('react-renderer', this.injector);
  }
}

现在我们需要ReactApplication在其中初始化ReactJS应用程序的组件：

interface IReactApplication {
  injector: Injector;
}

class ReactApp extends React.Component<IReactApplication, any> {
  constructor(props) {
    super(props);
  }

  render() {
    return (
      <div className={'renderer'}>
        <h2>ReactJS component: </h2>
        <br/>
        <ReactHero/>
      </div>
    );
  }
}

export class ReactApplication {

  static initialize(
    containerId: string,
    injector: Injector
  ) {
    ReactDOM.render(
      <ReactApp injector={injector}/>,
      document.getElementById(containerId)
    );
  }
}

我们需要ReactHero以下示例中使用的组件：

class ReactHero extends React.Component<any, any> {

  constructor(props) {
    super(props);
  }

  render() {
    return (
      <span>
        <span>react-hero works!</span><br/>
        <span>Don't have any data</span>
      </span>
    );
  }
}
export default ReactHero;

在Angular App中，我们应该使用ReactRenderercomponent，所以我们使用：

App.component data:
<hr>
<h2>This is Angular</h2>
<img width="100" alt="Angular Logo" src="data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAyNTAgMjUwIj4KICAgIDxwYXRoIGZpbGw9IiNERDAwMzEiIGQ9Ik0xMjUgMzBMMzEuOSA2My4ybDE0LjIgMTIzLjFMMTI1IDIzMGw3OC45LTQzLjcgMTQuMi0xMjMuMXoiIC8+CiAgICA8cGF0aCBmaWxsPSIjQzMwMDJGIiBkPSJNMTI1IDMwdjIyLjItLjFWMjMwbDc4LjktNDMuNyAxNC4yLTEyMy4xTDEyNSAzMHoiIC8+CiAgICA8cGF0aCAgZmlsbD0iI0ZGRkZGRiIgZD0iTTEyNSA1Mi4xTDY2LjggMTgyLjZoMjEuN2wxMS43LTI5LjJoNDkuNGwxMS43IDI5LjJIMTgzTDEyNSA1Mi4xem0xNyA4My4zaC0zNGwxNy00MC45IDE3IDQwLjl6IiAvPgogIDwvc3ZnPg==">
<hr>

<!-- Without data binding -->
<app-react-renderer></app-react-renderer>

目前，我们有带有嵌入式ReactJS应用程序的Angular应用程序，但是没有任何通信。对您来说足够了吗？如果是的话，就这些了。如果您需要在两个应用程序之间进行任何形式的通信，请在下面为您介绍RxJS选项。

具有双向通信的Angular-ReactJS

在此示例中，RxJS支持双向数据绑定。您可以获取此数据，并在ReactJS应用和Angular应用中使用它们以查看所有更改。这对于许多项目来说已经足够了，但是您可以使用不同的选项来获得这种双向通信，例如，可以对它们使用Redux。

为了清楚起见，下面我将提供此部分的完整目录结构：

angular /
  hero.service.ts
  ng-hero.component.ts // Component in Angular
  react-bidirectional-renderer.component.ts // ReactJS renderer with bidirectional communication
model /
  hero.ts // interface for Hero object
react-bidirectional
  react-bidirectional-application.tsx // React init application with bidirectional communication
  react-bidirectional-hero.tsx // React hero component with RxJS support
app.component.html
app.component.ts

首先，我们创建IHero带有数据的接口：/model/hero.ts

export interface IHero {
  name: string;
  age: number;
}

在下一步中，我们创建angular/hero.service.ts服务，以在应用程序的Angular部分中使用它：

@Injectable({
  providedIn: 'root'
})
export class HeroService {
  private heroes$: BehaviorSubject<IHero[]> = new BehaviorSubject([]);

  constructor() {
  }

  addHeroes(hero: IHero) { // To add new hero
    const actualHero = this.heroes$.value;
    actualHero.push(hero);
    this.heroes$.next(actualHero);
  }

  updateHeroAge(heroId: number, age: number) { // To update age of selected hero
    const actualHero = this.heroes$.value;
    actualHero[heroId].age = age;
    this.heroes$.next(actualHero);
  }

  getHeroes$(): BehaviorSubject<IHero[]> { // To get BehaviorSubject and pass it into ReactJS
    return this.heroes$;
  }
}

然后app.component.ts我们用数据初始化（Zeus和Poseidon）：

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html'
})
export class AppComponent implements OnInit {
  public heroesObj$: BehaviorSubject<IHero[]>;
  public heroes: IHero[];

  constructor(private heroService: HeroService) {}

  ngOnInit(): void {
    this.heroService.getHeroes$().subscribe((res: IHero[]) => {
      this.heroes = res;
    });

    this.heroesObj$ = this.heroService.getHeroes$();

    this.initHeroes();
  }

  initHeroes() {
    this.heroService.addHeroes({name: 'Zeus', age: 88});
    this.heroService.addHeroes({name: 'Poseidon', age: 46});
  }
}

在下一步中，我们应该准备应用程序的ReacJS部分，因此我们创建react-bidirectional/react-bidirectional- application.tsx文件：

interface IReactBidirectionalApp {
  injector: Injector;
  heroes$: BehaviorSubject<IHero[]>; // We use this interface to grab RxJS object
}

class ReactBidirectionalApp extends React.Component<IReactBidirectionalApp, any> {
  constructor(props) {
    super(props);

    this.state = {
      heroes$: this.props.heroes$ // and we pass this data into ReactBidirectionalHero component
    };
  }

  render() {
    return (
      <div className={'renderer'}>
        <h2>ReactJS component (bidirectional data binding): </h2>
        <ReactBidirectionalHero heroes$={this.state.heroes$}/>
      </div>
    );
  }
}

export class ReactBidirectionalApplication {

  static initialize(
    containerId: string,
    injector: Injector,
    heroes$: BehaviorSubject<IHero[]>, // This is necessary to get RxJS object
  ) {
    ReactDOM.render(
      <ReactBidirectionalApp injector={injector} heroes$={heroes$}/>,
      document.getElementById(containerId)
    );
  }
}

在下一步中，我们需要ReactBidirectionalHero组件，因此我们将其创建：

interface IReactBidirectionalHero {
  heroes$: BehaviorSubject<IHero[]>;
}

class ReactBidirectionalHero extends React.Component<IReactBidirectionalHero, any> {
  constructor(props) {
    super(props);

    this.state = {
      heroes: []
    };

    this.addAge = this.addAge.bind(this); // Register function to bump age
    this.addHero  = this.addHero.bind(this); // Register function to add new Hero
  }

  componentDidMount(): void {
    // In componentDidMount we subscribe heroes$ object
    this.props.heroes$.subscribe((res: IHero[]) => {
      // and we pass this data into React State object
      this.setState({heroes: res});
    });
  }

  addAge(i: number) {
    const temp = this.state.heroes;
    temp[i].age = temp[i].age + 1;

    // In this way we update RxJS object
    this.props.heroes$.next( temp);
  }

  addHero() {
    const temp = this.state.heroes;
    temp.push({name: 'Atena', age: 31});

    // In this way we update RxJS object
    this.props.heroes$.next(temp);
  }

  render() {
    // Hire we render RxJS part of application with addAge button and ADD ATENA button below
    const heroes = this.state.heroes.map((hero: IHero, i) => {
      return <span key={i}>{hero.name} - {hero.age} <button onClick={() => this.addAge(i)}>Add {hero.name} age</button><br/></span>;
    });
    return (
      <span>
        <span>react-hero works!</span><br/>
        {heroes}
        <br/>
        <button onClick={this.addHero}>ADD ATENA</button>
      </span>
    );
  }
}

export default ReactBidirectionalHero;

现在我们需要在Angular应用程序中初始化ReactJS应用程序，因此我们可以创建angular/react-bidirectional- renderer.component.ts它-非常简单，与版本相比只有一个更改，而无需通信：

@Component({
  selector: 'app-react-owc-renderer',
  template: `<div class="react-container" id="react-owc-renderer"></div>`
})
export class ReactBidirectionalRendererComponent implements OnInit {
  // Hire we get data from parent component, but of course we can also subscribe this data directly form HeroService if we prefer this way
  @Input() heroes$: BehaviorSubject<IHero[]>;

  constructor(public injector: Injector) { }

  ngOnInit() {
    // We add only one parameter into initialize function
    ReactBidirectionalApplication.initialize('react-owc-renderer', this.injector, this.heroes$);
  }
}

现在，我们应该进行一些更改ng-hero.component.ts以查看所有效果：

@Component({
  selector: 'app-ng-hero',
  template: `
    <div>
      <span>ng-hero works!</span><br/>
      <span *ngFor="let hero of heroes; let i = index;">{{hero.name}} - {{hero.age}} - <button (click)="addAge(i)">Add {{hero.name}} age</button><br/></span>
      <br/>
      <button (click)="addHero()">ADD AFRODITA</button>
    </div>
  `
})
export class NgHeroComponent implements OnInit {
  public heroes: IHero[];

  constructor(private heroService: HeroService) { }

  ngOnInit() {
    this.heroService.getHeroes$().subscribe((res: IHero[]) => {
      this.heroes = res;
    });
  }

  addAge(heroId: number) {
    this.heroService.updateHeroAge(heroId, this.heroes[heroId].age + 1);
  }

  addHero() {
    this.heroService.addHeroes({name: 'Afrodita', age: 23});
  }

}

最后我们改变app.component.html：

App.component data:
<hr>
<h2>This is Angular component: </h2>
<app-ng-hero></app-ng-hero>
<hr>

<!-- With bidirectional data binding-->
<app-react-owc-renderer [heroes$]="heroesObj$"></app-react-owc-renderer>
<hr>

一切都应该工作。如果您有任何问题，请随时提问。

您可以在GitHub上找到此解决方案的完整存储库。

如果您需要演示，请点击雇用。