Angular 4在2个不相关的组件之间传递数据

我有一个关于在 Angular 中传递数据的问题。

首先，我没有这样的结构<parent><child [data]=parent.data></child></parent>

我的结构是

<container>
  <navbar>
    <summary></summary>
    <child-summary><child-summary>
  </navbar>
  <content></content>
</container>

So, in <summary />我有一个可以发送值的选择<child-summary /> and <content />.

OnSelect 方法在内部 (change) 下很好地触发<summary />成分。

所以，我尝试了@Input, @Output and @EventEmitter指令，但我不知道如何将事件检索为组件的 @Input ，除非继续父/子模式。我建立的所有示例都与组件之间存在关系。

编辑：BehaviorSubject 不起作用的示例（所有连接到 API 的服务都运行良好，只有 observable 在启动时触发，但在 select 值更改时则不会触发）

共享服务=company.service.ts（用于检索公司数据）

import { Injectable } from '@angular/core';
import { Headers, Http, Response } from '@angular/http';
import { BehaviorSubject } from 'rxjs/BehaviorSubject';

import { Observable } from 'rxjs/Observable';
import 'rxjs/add/operator/toPromise';

@Injectable()
export class SrvCompany {

    private accountsNumber = new BehaviorSubject<string[]>([]);
    currentAccountsNumber = this.accountsNumber.asObservable();

    changeMessage(accountsNumber: string[]) {
        this.accountsNumber.next(accountsNumber);
    }

    private _companyUrl = 'api/tiers/';

    constructor(private http: Http) { }

    getSociete(): Promise<Response> {
        let url = this._companyUrl;
        return this.http.get(url).toPromise();
    }
}

Invoice.component.ts（“子”）

import { Component, OnInit, Input } from '@angular/core';
import { Headers, Http, Response } from '@angular/http';

import { SrvInvoice } from './invoice.service';
import { SrvCompany } from '../company/company.service';

@Component({
    selector: 'invoice',
    templateUrl: 'tsScripts/invoice/invoice.html',
    providers: [SrvInvoice, SrvCompany]
})

export class InvoiceComponent implements OnInit  {

    invoice: any;

    constructor(private srvInvoice: SrvInvoice, private srvCompany: SrvCompany)
    {

    }

    ngOnInit(): void {
        //this.getInvoice("F001");

        // Invoice data is linked to accounts number from company.
        this.srvCompany.currentAccountsNumber.subscribe(accountsNumber => {
            console.log(accountsNumber);
            if (accountsNumber.length > 0) {
                this.srvInvoice.getInvoice(accountsNumber).then(data => this.invoice = data.json());
            }
        });
    }

    //getInvoice(id: any) {
    //    this.srvInvoice.getInvoice(id).then(data => this.invoice = data.json());
    //}
}

company.component.ts（触发“父级”）

import { Component, Inject, OnInit, Input } from '@angular/core';
import { Headers, Http, Response } from '@angular/http';

import { SrvCompany } from './company.service';

@Component({
    selector: 'company',
    templateUrl: 'tsScripts/company/company.html',
    providers: [SrvCompany]    
})

export class CompanyComponent implements OnInit {

    societes: any[];    
    soc: Response[]; // debug purpose
    selectedSociete: any;

    ville: any;
    ref: any;
    cp: any;
    accountNumber: any[];

    constructor(private srvSociete: SrvCompany)
    {

    }

    ngOnInit(): void {
        this.getSocietes();
    }

    getSocietes(): void {

        this.srvSociete.getSociete()
            .then(data => this.societes = data.json())
            .then(data => this.selectItem(this.societes[0].Id));
    }

    selectItem(value: any) {
        this.selectedSociete = this.societes.filter((item: any) => item.Id === value)[0];
        this.cp = this.selectedSociete.CodePostal;
        this.ville = this.selectedSociete.Ville;
        this.ref = this.selectedSociete.Id;
        this.accountNumber = this.selectedSociete.Accounts;
        console.log(this.accountNumber);
        this.srvSociete.changeMessage(this.accountNumber);
    }
}

在这种情况下，您希望使用共享服务，因为您的组件被构造为兄弟和孙子。这是我创建的视频中的一个示例组件之间共享数据这解决了这个问题。

首先在服务中创建一个BehaviorSubject

import { Injectable } from '@angular/core';
import { BehaviorSubject } from 'rxjs/BehaviorSubject';
@Injectable()
export class DataService {

  private messageSource = new BehaviorSubject("default message");
  currentMessage = this.messageSource.asObservable();

  constructor() { }

  changeMessage(message: string) {
    this.messageSource.next(message)
  }

}

然后将此服务注入到每个组件中并订阅可观察对象。

import { Component, OnInit } from '@angular/core';
import { DataService } from "../data.service";
@Component({
  selector: 'app-parent',
  template: `
    {{message}}
  `,
  styleUrls: ['./sibling.component.css']
})
export class ParentComponent implements OnInit {

  message:string;

  constructor(private data: DataService) { }

  ngOnInit() {
    this.data.currentMessage.subscribe(message => this.message = message)
  }

}

您可以更改任一组件的值，即使您没有父/子关系，该值也会更新。

import { Component, OnInit } from '@angular/core';
import { DataService } from "../data.service";
@Component({
  selector: 'app-sibling',
  template: `
    {{message}}
    <button (click)="newMessage()">New Message</button>
  `,
  styleUrls: ['./sibling.component.css']
})
export class SiblingComponent implements OnInit {

  message:string;

  constructor(private data: DataService) { }

  ngOnInit() {
    this.data.currentMessage.subscribe(message => this.message = message)
  }

  newMessage() {
    this.data.changeMessage("Hello from Sibling")
  }

}