Although tomcat may present consistent state based on data held in say the http 
session these are two instances of your spa.  Have you thought of using post 
message?

Raul

> On Mar 24, 2014, at 5:15 PM, Sriram Rajagopal <[email protected]> 
> wrote:
> 
> I've an angularJS app. I've a page with the following template and controller:
> 
> <div ng-controller="ParentCtrl">
>     <p>{{food}}</p>
>     <div ng-controller="ChildCtrl">
>         <button ng-click="onBtnClk()">{{buttonTitle}}</button>
>     </div>
> </div>
> The two controllers:
> 
> app.controller('ParentCtrl', ParentCtrl);
> ParentCtrl.$inject = ['$scope','$rootScope'];
> function ParentCtrl($scope,$rootScope) {
>     $rootScope.food = "hi"
>     $rootScope.$on("UPDATE_PARENT", function(event,msg) {
>         $rootScope.food = msg;
>         console.log("Witnessed")
>     });
> }
> 
> app.controller('ChildCtrl', ChildCtrl);
> ChildCtrl.$inject = ['$scope','$rootScope'];
> 
> function ChildCtrl($scope,$rootScope) {
>     $scope.buttonTitle="Update Parent"
>     $scope.onBtnClk = function() {
>         $rootScope.$emit("UPDATE_PARENT","updatedyy");
>         console.log($rootScope)
>     };
> }
> So basically, I've a parent and a child controller; Clicking the button in 
> the child controller emits an event with the message "updatedyy". This is 
> picked up the $on in the parent controller which sets the value of 
> $rootScope.food to the message value.
> 
> Now my question is, is it possible to see this value change of a variable in 
> all instances of the app? For example, if I've the app (running on a Tomcat 
> server) open in two tabs in my browser, and I click on the button - is it 
> possible to get a changed value in the other tab as well?
> 
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