Angular 2 - 使用RXJS Observables
问题描述:
我在Angular 1中有以下jsfiddle,它有两个组件,boxA,boxB,它们监听msgService中定义的一个名为msgSubject的RXJS主体。Angular 2 - 使用RXJS Observables
mainCtrl通过msgService广播函数广播消息。如果boxA和boxB订阅了msgSubject(有一个选项可取消订阅),则更新的消息将显示在各个组件视图中。
Angular 1 Observable Js Fddile
我的问题是我怎么复制这角2?我搜索了Google,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,我很感激。提前致谢。
角1码
HTML
<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-->
的Javascript
var app = angular.module('myApp', ['ngMaterial']);
app.controller('mainCtrl', function($scope,msgService) {
$scope.name = "Observer App Example";
$scope.msg = 'Message';
$scope.broadcastFn = function(){
msgService.broadcast($scope.msg);
}
});
app.component("boxA", {
bindings: {},
controller: function(msgService) {
var boxA = this;
boxA.msgService = msgService;
boxA.msg = '';
var boxASubscription = boxA.msgService.subscribe(function(obj) {
console.log('Listerner A');
boxA.msg = obj;
});
boxA.unsubscribe = function(){
console.log('Unsubscribe A');
boxASubscription.dispose();
};
},
controllerAs: 'boxA',
templateUrl: "/boxa"
})
app.component("boxB", {
bindings: {},
controller: function(msgService) {
var boxB = this;
boxB.msgService = msgService;
boxB.msg = '';
var boxBSubscription = boxB.msgService.subscribe(function(obj) {
console.log('Listerner B');
boxB.msg = obj;
});
boxB.unsubscribe=function(){
console.log('Unsubscribe B');
boxBSubscription.dispose();
};
},
controllerAs: 'boxB',
templateUrl: "/boxb"
})
app.factory('msgService', ['$http', function($http){
var msgSubject = new Rx.Subject();
return{
subscribe:function(subscription){
return msgSubject.subscribe(subscription);
},
broadcast:function(msg){
console.log('success');
msgSubject.onNext(msg);
}
}
}])
答
你可以使用一个服务的两个组件之间的通信:在一个组件
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S发送一个广播消息:
BroadcastService.announceBoradcast("Hello World");
然后其他组分可以订阅广播:
BroadcastService.broadcastAnnounce$.subscribe((message) => {
console.log(message);
})
以下是在Angular2上的组件之间的通信的一些信息 https://angular.io/docs/ts/latest/cookbook/component-communication.html#!#bidirectional-service
https://开头angular.io/docs/ts/latest/cookbook/component-communication.html –