AngularJS中的视图未更新

Question

在事件回调中更新模型时更新模型属性对视图没有影响,有什么想法可以解决这个问题吗？

这是我的服务:

angular.service('Channel', function() {        
    var channel = null; 

    return {        
        init: function(channelId, clientId) {
            var that = this;        

            channel = new goog.appengine.Channel(channelId);
            var socket = channel.open();

            socket.onmessage = function(msg) {
                var args = eval(msg.data);              
                that.publish(args[0], args[1]);
            };
        }       
    };
});

publish() 功能是在控制器中动态添加的.

控制器:

App.Controllers.ParticipantsController = function($xhr, $channel) {
    var self = this;

    self.participants = [];     

    // here publish function is added to service
    mediator.installTo($channel); 

    // subscribe was also added with publish        
    $channel.subscribe('+p', function(name) { 
        self.add(name);     
    });                 

    self.add = function(name) {     
        self.participants.push({ name: name });     
    }
};

App.Controllers.ParticipantsController.$inject = ['$xhr', 'Channel'];

视图:

<div ng:controller="App.Controllers.ParticipantsController">      
    <ul>
        <li ng:repeat="participant in participants"><label ng:bind="participant.name"></label></li>
    </ul>

    <button ng:click="add('test')">add</button>
</div>

所以问题是单击按钮可以正确地更新视图,但是当我收到来自Channel Nothings的消息时,甚至add()会调用该函数

Answer 1

你错过了$scope.$apply().

每当你触摸Angular世界之外的任何东西时,你需要打电话$apply,通知Angular.那可能来自:

• xhr回调(由$ http服务处理)
• setTimeout回调(由$defer服务处理)
• DOM事件回调(由指令处理)

在你的情况下,做这样的事情:

// inject $rootScope and do $apply on it
angular.service('Channel', function($rootScope) {
  // ...
  return {
    init: function(channelId, clientId) {
      // ...
      socket.onmessage = function(msg) {
        $rootScope.$apply(function() {
          that.publish(args[0], args[1]);
        });
      };
    }
  };
});