AngularJs – RXJS Observable取消订阅

我已经设置了一个RXJS可观察.我有两个组件订阅服务工厂的主题.如何取消订阅所选组件到主题以便按下按钮它会停止收听主题广播？

我的代码：

<div ng-app="myApp" ng-controller="mainCtrl">

  <script type="text/ng-template" id="/Boxa">
  BoxA - Message Listener: </br>
  <strong>{{BoxA.msg}}</strong></br>
  <md-button ng-click='BoxA.unsubcribe()' class='md-warn'>Unsubscribe A</md-button>
  </script>
  <script type="text/ng-template" id="/Boxb">
    BoxB - Message Listener: </br>
  <strong>{{BoxB.msg}}</strong></br>
  <md-button ng-click='BoxB.unsubcribe()' class='md-warn'>Unsubscribe B</md-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-->


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 = '';
        BoxA.msgService.subscribe(function(obj) { 
            console.log('Listerner A');
          BoxA.msg = obj;
                });
        BoxA.unsubscribe=function(){

        };

      },controllerAs: 'BoxA',templateUrl: "/Boxa"
})
app.component("BoxB",controller: function(msgService) {
        var BoxB = this;
        BoxB.msgService = msgService;            
        BoxB.msg = '';
        BoxB.msgService.subscribe(function(obj) { 
            console.log('Listerner B');
          BoxB.msg = obj;
                });

        BoxB.unsubscribe=function(){

        };
      },controllerAs: 'BoxB',templateUrl: "/Boxb"
})

app.factory('msgService',['$http',function($http){
    var msgSubject = new Rx.ReplaySubject();
    return{
        subscribe:function(subscription){
            msgSubject.subscribe(subscription);
        },broadcast:function(msg){
        console.log('success');
            msgSubject.onNext(msg);
        }
    }   
}])

请参阅更新的小提琴： here

subscribe函数返回一个Disposable来使用,你必须首先从你的工厂返回订阅(第60行)：

subscribe: function(subscription){
    return msgSubject.subscribe(subscription);
}

这将允许您将订阅存储在每个控制器中以便将来使用. (第21和第42行)

var BoxASubscription = BoxA.msgService.subscribe(function(obj) {
    console.log('Listerner A');
    BoxA.msg = obj;
});

然后,您可以在取消订阅时调用订阅上的dispose方法：

BoxA.unsubscribe = function(){
    console.log('Unsubscribe A');
    BoxASubscription.dispose();
};

注：

出于某种原因,我无法让您的演示与< md-button>一起使用所以我将其更改为< button>为了演示.

原文链接：https://www.f2er.com/angularjs/142436.html

AngularJs – RXJS Observable取消订阅

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