How to get selected values into scope from drop down while using nested ng-option?

Question

Following is the view code I'm using to populate multiple select dropdown

<div ng-controller="sourceController">
  <form novalidate ng-submit="submit()">
    <div class="row">
      <div class="addNewButton">
        <button type="button" class="btn btn-info btn-sm" data-toggle="modal" data-target="#myModal">Add New Data Source</button>
        <div ng-include="'pages/modal.html'"></div>
      </div>
    </div>
    <div class="row">
      <div class="col-sm-3">
        Location:
        <select id="location" ng-model="location" ng-options="city for (city, facilities) in sourceSelection " style="width: 100px">
          <option value=''>Select</option>
        </select>

      </div>

      <div class="col-sm-3">
        Facility:
        <select id="facility" ng-disabled="!location" ng-model="facility" ng-options="facility for (facility, phases) in location">
          <option value=''>Select</option>
        </select>

      </div>

      <div class="col-sm-3">
        Phase :
        <select id="phase" ng-disabled="!facility" ng-model="phase" ng-options="phase for phase in facility">
          <option value=''>Select</option>
        </select>

      </div>

      <div class="col-sm-3">
        Device Type
        <select id="deviceType" ng-disabled="!phase" ng-model="deviceType">
          <option value=''>Select</option>
          <option ng-repeat="deviceType in deviceTypes" value="{{deviceType}}">{{deviceType}}</option>
        </select>
      </div>
    </div>

    <input type="submit" id="submit" value="Submit" />

  </form>
  <button onclick="myFunction()">click here</button>
  selected choices : {{location}} , {{facility}},

</div>

And the controller I'm using is

app.controller('sourceController', function($scope, $http, $rootScope) {
  $scope.sourceSelection = {
    "Chennai": {
      "siruseri": ["phase1", "phase2"],
      "chennai one": ["phase1"]
    },
    "kochi": {
      "Kochi_technopark": ["phase1"]
    }
  };
});

Now I want to bind selected field (ie. selected location , Facility , phase in controller)with $scope in controller side and model I'm using there is giving me the value of the selected drop down key.

Answer 1

So following two lines are the answer , i got from my colleauge

$scope.getSelectedLocation= function(){
        var temp = document.getElementById("location");
        var location = temp.options[temp.selectedIndex].value;
      console.log(location);
} ;