How to push selected values in checkbox list using angularjs

function Test1Controller($scope) {
  $scope.items = [{"name": "Samsung Galaxy Note", "selected": false}, {"name": "Samsung Galaxy S6", "selected": true}, {"name": "Samsung Galaxy Avant", "selected": false}, {"name": "Samsung Galaxy Young","selected": false}];

  $scope.offers = [{
    id: "as23456",
    Store: "samsung",
    Offer_message: "1500rs off",
    modalname: "Samsung Galaxy Young"
  }, {
    id: "de34575",
    Store: "samsung",
    Offer_message: "20% Flat on Samsung Galaxy S6",
    modalname: "Samsung Galaxy S6"
  }, ];

  var selectedItems = function() {
    return $scope.items.filter(function(item) {
      return item.selected;
    });
  };

  $scope.availableOffers = function() {
    var items = selectedItems();
    return $scope.offers.filter(function(offer) {
      return items.some(function(item) {
        return item.name === offer.modalname;
      });
    });
  };
}

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.1.5/angular.min.js"></script>

<div ng-app>
  <div ng-controller="Test1Controller" >
<div ng-repeat="item in items">
  <input type="checkbox" ng-model="item.selected" ng-click="toggleSelection(item)"/> {{item.name}}
</div>
<select ng-show="availableOffers().length > 0" ng-model="offerSelected">
  <option ng-repeat="offer in availableOffers()"  value="{{offer.id}}">{{offer.Offer_message}}</option>
</select>

  <input type="button" name="submit" value="submit" ng-click="check()"/>
  </div>
</div>

function Test1Controller($scope) {

  var serverData = 
  [
    "Samsung Galaxy Note",
    "Samsung Galaxy S6",
    "Samsung Galaxy Avant",
    "Samsung Galaxy Young"
  ];
  $scope.items = [];
  //var selectedvalue = window.localStorage.getItem("selectedvalue");
  // here selected value Samsung Galaxy S6
  var selectedvalue = "Samsung Galaxy S6";
  for (var i = 0; i < serverData.length; i++) {
    var modal = {
      name: serverData[i],
      selected: selectedvalue.indexOf(serverData[i]) >= 0
    };
    $scope.items.push(modal);

  }
  //----------------------------Our Shop Offers----------------------------------------
  $scope.offers = [{
      id: "as23456",
      Store: "samsung",
      Offer_message: "1500rs off",
      modalname: "Samsung Galaxy Young"

    }, {
      id: "de34575",
      Store: "samsung",
      Offer_message: "20% Flat on Samsung Galaxy S6",
      modalname: "Samsung Galaxy S6"

    }, ]
    //-----------------------------------------------------------------------------------
  $scope.selection = [];

  $scope.toggleSelection = function toggleSelection(item) {
    $scope.gotOffers = [];
    var idx = $scope.selection.indexOf(item);

    // is currently selected
    if (idx > -1) {
      $scope.selection.splice(idx, 1);
    }

    // is newly selected
    else {
      $scope.selection.push(item);
    }

    for (var i = 0; i < $scope.selection.length; i++) {
      for (var j = 0; j < $scope.offers.length; j++) {
        console.log($scope.selection[i].name + "   " + $scope.offers[j].modalname)
        if ($scope.selection[i].name == $scope.offers[j].modalname) {
          var idx = $scope.gotOffers.indexOf($scope.offers[j].Offer_message);
          if (idx == -1) {
            console.log("inside idx")
            $scope.gotOffers.push($scope.offers[j]);
          }
        }
      }

    }
    console.log($scope.offers);

  };
  //---------------------------------------------------------------------------------------
  $scope.check = function()

  {


    var checkedItems = [];
    console.log($scope.offerSelected)
    for (var i = 0; i < $scope.items.length; i++) {
      if ($scope.items[i].selected) {
        checkedItems.push($scope.items[i].name);
      }
    }
    console.log(checkedItems);
  }



}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.20/angular.min.js"></script>

<div ng-app>
  <div ng-controller="Test1Controller">
    <div ng-repeat="item in items">
      <input type="checkbox" ng-model="item.selected" ng-checked="selection.indexOf(item) > -1" ng-click="toggleSelection(item)" /> {{item.name}}
    </div>
    <select ng-show="gotOffers.length > 0" ng-model="offerSelected">
      <option value="">Select offer</option>
      <option ng-repeat="offer in gotOffers" ng-value="offer.id">{{offer.Offer_message}}</option>
    </select>

    <input type="button" name="submit" value="submit" ng-click="check()" />
  </div>
</div>