在 angular 流星收集更新后执行一个函数

Question

我正在创建多人游戏，我希望在第一个玩家更新集合中的 "isStarted" 字段后执行特定函数。

在我的控制器中，我有：

angular.module('mcitygame').directive('gcaseGame', function() {
return {
    restrict: 'E',
    templateUrl: 'client/gcases/gcase-game/gcase-game.html',
    controllerAs: 'gcaseGame',
    controller: function($scope, $stateParams, $reactive, $window, $element) {

        $reactive(this).attach($scope);

        this.subscribe('gcases'); // This is the collection I need to watch if the "isStarted" field has changed

        this.helpers({
            gcase: () => {
                return GCases.findOne({_id: 'dynamicID'}) //I'm using  $stateParams.gcaseId, which I get from the router, but I put 'dynamicID' just for the purpose of this example.
            });

        this.startGame = function(option){
            if(option == 1) {
                console.log(" Users clicked me from the interface!");
                GCases.update({_id :'dynamicID'}, {
                    $set: {isStarted: true, updatedAt: Date.now()}
                });
            } else {
                console.log("I am here because someone called me from a different client!");
            }

        };

        ////////////////////////// I need to be able to do something like this
        this.autorun(() => { 
            if(this.gcase.isStarted){
                console.log(" isStartred = " + this.gcase.isStarted);
                this.startGame();
            }
        });
        ////////////////////////// or this
        this.gcase.observeChanges({
            changed: function (id, gcase) {
                console.log(" isStartred = " + this.gcase.isStarted);
                this.startGame();
            }
        });
        //////////////////////////

    }
}})

在控制器之外，我有：

GCases = new Mongo.Collection("gcases");

任何帮助将不胜感激..

Answer 1

您可以在更新中使用回调函数。

Answer 2

好的..我的做法是这样的：

    var that = this; // I did this since I need to call it from inside 'observeChanges'
    GCases.find({_id:'dynamicID'}).observeChanges({ //'this.gcase', as proposed in the question, was returning an error saying it's not a function
        changed: function (id, gcase) {
            console.log(" isStartred = " + gcase.isStarted);
            that.startGame(2); // any value beside 1 will invoke the 'else' condition, and the log will only appears on other clients consoles
        }
    });

它奏效了。我不确定是否有更好的方法，但这是一种方法。希望对您有所帮助。

在 angular 流星收集更新后执行一个函数

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