Reload image in Angular

Question

I'm trying to reload an image from my webserver every n seconds. The code below drags the new picture, but it doesn't replace the old one in the client. Where is my mistake?

<div ng-app="refresh-div" ng-controller="refresh_control">
    <img ng-src="{{imageUrl}}" />
</div>

<script>
    var app = angular.module('refresh-div', [])
        .controller('refresh_control', function ($scope, $http, $timeout) {
            $scope.imageURL = 'assets/now.png?_ts=' + new Date().getTime();

            $scope.getData = function () {
                $http.get($scope.imageURL, {
                    cache: false
                }).success(function (data, status, headers, config) {
                    $scope.image = data;
                    $scope.imageUrl = "http://mywebsite/assets/now.png";
                });
            };

            $scope.intervalFunction = function () {
                $timeout(function () {
                    $scope.getData();
                    $scope.intervalFunction();
                }, 1500)
            };

            $scope.intervalFunction();
        });
</script>

Answer 1

a) <img ng-src="{{imageUrl}}" /> - it force Angular.js watch the changes of the value of $scope.imageUrl. When this value changed Angular update image.

b)

$scope.getData = function () {
  $http.get($scope.imageURL, {
    cache: false
})
.success(function (data, status, headers, config) {
  $scope.image = data;
  $scope.imageUrl = "http://mywebsite/assets/now.png"; // <== this line
});

This line $scope.imageUrl = "http://mywebsite/assets/now.png"; always set the same value for $scope.imageUrl . In result there is no updates.

Maybe this code

$scope.intervalFunction = function () {
  $timeout(function () {
    $scope.imageURL = 'assets/now.png?_ts=' + new Date().getTime();
  }, 1500);
};

makes more sense?

Answer 2

Fixed the problem, the issue was that $scope.imageURL = ' http://mywebsite/assets/now.png?_ts= ' + new Date().getTime(); was missing from the success function. Basically, I needed to updated the url of the image. I'm not sure if it is the best solution, but it is working for my requirements.

<div ng-app="refresh-div" ng-controller="refresh_control">
    <img ng-src="{{imageURL}}" />
</div>

<script>
    var app = angular.module('refresh-div', [])
        .controller('refresh_control', function ($scope, $http, $timeout) {
            $scope.imageURL = 'http://mywebsite/assets/now.png?_ts=' + new Date().getTime(); 

            $scope.getImage = function () {
                $http.get($scope.imageURL, {
                    cache: false
                }).success(function (data, status, headers, config) {
                    $scope.imageURL = 'http://mywebsite/assets/now.png?_ts=' + new Date().getTime();
                });
            };

            $scope.intervalFunction = function () {
                $timeout(function () {
                    $scope.getImage();
                    $scope.intervalFunction();
                }, 1500)
            };

            $scope.intervalFunction();
        });
</script>