我在Angular 1中有以下jsfiddle,它有两个组件boxA,boxB,它们监听在msgService中定义的名为msgSubject的RXJS主题。
mainCtrl通过msgService广播功能广播消息。如果boxA和boxB订阅了msgSubject(有一个取消订阅选项),则更新的消息将显示在每个相应的组件视图中。
Angular 1 Observable Js Fddile
我的问题是如何在Angular 2中复制它?我用google搜索过,大部分教程都与HTTP和异步搜索有关。我很感激,如果有人能够至少告诉我设置主题,广播和订阅的语法。任何帮助我都很感激。提前致谢。
Angular 1 Code
HTML
lazy var realm = try! Realm(configuration:Realm.Configuration(deleteRealmIfMigrationNeeded: true))
的Javascript
<div ng-app="myApp" ng-controller="mainCtrl">
<style>
.table-cell{
border-right:1px solid black;
}
</style>
<script type="text/ng-template" id="/boxa">
BoxA - Message Listener: </br>
<strong>{{boxA.msg}}</strong></br>
<button ng-click="boxA.unsubscribe()">Unsubscribe A</button>
</script>
<script type="text/ng-template" id="/boxb">
BoxB - Message Listener: </br>
<strong>{{boxB.msg}}</strong></br>
<button ng-click="boxB.unsubscribe()">Unsubscribe B</button>
</script>
<md-content class='md-padding'>
<h3>
{{name}}
</h3>
<label>Enter Text To Broadcast</label>
<input ng-model='msg'/></br>
<md-button class='md-primary' ng-click='broadcastFn()'>Broadcast</md-button></br>
<h4>
Components
</h4>
<box-a></box-a></br>
<box-b></box-b>
</md-content>
</div><!--end app-->
答案 0 :(得分:1)
您可以使用服务在两个组件之间进行通信:
import { Injectable } from '@angular/core';
import { Subject } from 'rxjs/Subject';
@Injectable()
export class BroadcastService {
private broadcastSource = new Subject<string>();
// Observable string streams
// Return as observale to encapsulate the subject
broadcastAnnounce$ = this.broadcastSource.asObservable();
// Service message commands
announceBoradcast(message: string) {
this.broadcastSource.next(message);
}
}
然后在一个组件中发送广播消息:
BroadcastService.announceBoradcast("Hello World");
然后其他组件可以订阅广播:
BroadcastService.broadcastAnnounce$.subscribe((message) => {
console.log(message);
})
以下是有关Angular2中组件之间通信的更多信息: https://angular.io/docs/ts/latest/cookbook/component-communication.html#!#bidirectional-service