javascript - AngularJS - Service talking to Controller -

angular js has pretty cool feature of two-way binding allows controller data automatically updated when view changes (or vice-versa). today can have controllers dependent on services. possible services depend on controller? e.g. if service wants fetch data controller on it's own will, possible?

also, possible extend scope of ng-model variable pass service (along controller) variable, keeps in sync automatically?

thanks.

when assign multiple variables same object , each reference same object.

following demonstration. may not preferred approach depending on use case

app.controller('mainctrl', function($scope, myservice) {     $scope.mainmodel = myservice.myobject; })  app.controller('otherctrl', function($scope, myservice) {     $scope.othermodel = myservice.myobject; })  app.factory('myservice', function() {   return {     myobject: {       name: 'test'     }   } }); 

both of following inputs show same value

<div ng-controller="mainctrl">      name:<input ng-model="mainmodel.name"> </div> <div ng-controller="otherctrl">      name:<input ng-model="othermodel.name"> </div> 

demo