Updating angularjs controller with websocket data - angularjs

Question

I'm trying to update my angularjs controller after receiving new information from a websocket server. I am using angular-websockets to create the connection with the websocket server.
Here is my code:
angular.module('VotingApp', ['ngWebSocket'])
.factory('MyVotingResults', function ($websocket) {
// Open a WebSocket connection
var ws = $websocket('ws://localhost:80/test');
//defaults
var collection = {
Question: "This is my question?",
Results: [
{ Percentage: 0, Picture: "http://www.kvmechelen.be/wp-content/uploads/2015/02/De-Witte.jpg", Player: "Seth De Witte", Number: "4", Position: "Defender", Winner: true },
{ Percentage: 0, Picture: "http://www.kvmechelen.be/wp-content/uploads/2016/02/15-16grpsf-037-19715104962_19124904603_o.jpg", Player: "Tim Matthys", Number: "7", Position: "Midfielder", Winner: false },
{ Percentage: 0, Picture: "http://www.kvmechelen.be/wp-content/uploads/2016/02/NICOLAS-VERDIER.jpg", Player: "Nicolas Verdier", Number: "99", Position: "Forward", Winner: false }
]
};
ws.onOpen(function () {
console.log("connectie is open");
ws.send("Hello world!");
});
ws.onClose(function () {
console.log("connectie is closed");
});
ws.onError(function () {
console.log("error!");
});
ws.onMessage(function (response) {
console.log("received an update: ", response);
collection = JSON.parse(response.data);
});
return {
collection: collection,
get: function () {
ws.send(JSON.stringify({ action: 'get' }));
}
};
})
.controller('VotingController', function ($scope, MyVotingResults) {
$scope.Data = MyVotingResults.collection;
})
I am initializing my collection variable with some data to begin. That works and it is shown on the page like it is supposed to.
Here is my html:
<div class="content" ng-controller="VotingController">
<div class="vraag">
<p>{{Data.Question}}</p>
</div>
<div class="antwoorden">
<div class="antw" ng-repeat="result in Data.Results">
<div class="result">
<div class="resultWinner">
<img src="img/winner.png" />
</div>
<div class="resultImage">
<img src="{{result.Picture}}" />
</div>
<div class="resultBalk">
<p><span class="timer">{{result.Percentage}}</span>%</p>
</div>
</div>
<div class="antwText">
<p><span>{{result.Number}}.</span> {{result.Player}}</p>
<p>{{result.Position}}</p>
</div>
</div>
</div>
</div>
My websocketserver is a simple testserver that sends back this json:
{
"Question": "Who deserves the Man of the Match award?",
"Results": [{
"Percentage": 25.0,
"Picture": "http://www.kvmechelen.be/wp-content/uploads/2015/02/De-Witte.jpg",
"Player": "Seth De Witte",
"Number": "4",
"Position": "Defender",
"Winner": false
}, {
"Percentage": 40.0,
"Picture": "http://www.kvmechelen.be/wp-content/uploads/2016/02/15-16grpsf-037-19715104962_19124904603_o.jpg",
"Player": "Tim Matthys",
"Number": "7",
"Position": "Midfielder",
"Winner": true
}, {
"Percentage": 35.0,
"Picture": "http://www.kvmechelen.be/wp-content/uploads/2016/02/NICOLAS-VERDIER.jpg",
"Player": "Nicolas Verdier",
"Number": "99",
"Position": "Forward",
"Winner": false
}]
}
Why won't page update? I based my code on this example:
https://angularclass.github.io/angular-websocket/
Any help is appreciated.
EDIT:
I changed my controller to this but it still doesn't work unfortunately.
.controller('VotingController', function ($scope, MyVotingResults) {
$scope.Data = MyVotingResults.collection;
$scope.$watch(function () {
return MyVotingResults.collection;
}, function (newValue) {
$scope.Data = newValue;
});
})

Answer 1

You can "watch" that service variable in your controller and update the scope accordingly:
$scope.$watch(function () {
return MyVotingResults.collection;
}, function (newValue) {
$scope.Data = newValue;
});