AngularJs Array not Binding To Template - html

Question

I have a controller named dataController, two services, named dataHttpServices and dataLocalServices and an html template, some directives.
In my html template, I have two different tabs uses same controller and add item to list in my controller from two different places.
In debug mode, I see the data change properly but the data binding is not working properly.
I don't know What is my mistake, help please. In code;
Here is Html;
<div
class="metadataSelect"
layout="column"
ng-model="selectedItems"
ng-show="selectedItems.length > 0">
<div layout="row" ng-repeat="item in selectedItems">
{{item.Name}}
</div>
</div>
Here is the controller;
$scope.addSelectedItem = function (selectedItem) {
var found = false;
var self = this;
dataLocalService.addSelectedItem(selectedItem);
$scope.selectedItems = dataLocalService.getSelectedItems();
};
And here is the service;
this.selectedItems = [];
this.addSelectedItem = function (item) {
this.selectedItems.push(item);
};
this.getSelectedItems = function () {
return this.selectedItems;
};
I call addSelectedItem from scope in two different button's click event with ng-click.
If I first add an item by click the first button and click the second button (first click the first button), the button binds the array to div correctly.
But when I add an item by click the second button before click the first button, the array does not bind to div.
After add some items to array by click the second button, when I click the first button, bind all the elements to div. For example three element at once but doesn't bind without clicking the first button.
What is my mistakes. Thanks for helps.

Answer 1

I solved it with using $scope.$watch. And I think the problem is their scope is different because i create controller twice with ng-controller. Here is the code snippet i found to solve it.
$scope.$watch('selectedItems', function () {
$scope.selectedItems = $metadataLocalService.getSelectedItems();
});
This solves my problem. Because watch is tracking the related data changes and etc.