how to update modal value in directive

angular.module('testApp', ['ionic', 'ion-google-place'])
.controller('MyController', function($scope, $ionicModal) {
    $scope.name="bb";
    $scope.centerOnMe = function()
    {
        $scope.change_location = 
            $scope.location
    }
    
    $scope.location = "empty";

$scope.foc = function()
{
    $scope.msg = "focus called";
}
$scope.blu = function()
{
    console.log('Blur called');
  $scope.msg = "blur called" ;
}

})

angular.module('ion-google-place', [])
    .directive('ionGooglePlace', [
        '$ionicTemplateLoader',
        '$ionicBackdrop',
        '$ionicPlatform',
        '$q',
        '$timeout',
        '$rootScope',
        '$document',
        function($ionicTemplateLoader, $ionicBackdrop, $ionicPlatform, $q, $timeout, $rootScope, $document) {
            return {
                require: 'ngModel',
                restrict: 'AE',
                template: '<input type="text" readonly="readonly"  class="ion-google-place" autocomplete="off" ng-change="centerOnMe()">',
                replace: true,
                /*scope: {
                    ngModel: '=?'
                },*/
                link: function(scope, element, attrs, ngModelCtrl) {
                    var unbindBackButtonAction;

                    scope.locations = [];
                    var geocoder = new google.maps.Geocoder();
                    var searchEventTimeout = undefined;

                    var POPUP_TPL = [
                        '<div class="ion-google-place-container">',
                            '<div class="bar bar-header item-input-inset">',
                                '<label class="item-input-wrapper">',
                                    '<i class="icon ion-ios7-search placeholder-icon"></i>',
                                    '<input class="google-place-search" type="search" ng-focus="foc()" ng-blur="blu()" ng-model="searchQuery" placeholder="' + (attrs.searchPlaceholder || 'Enter an address, place or ZIP code') + '">',
                                '</label>',
                                '<button class="button button-clear">',
                                    attrs.labelCancel || 'Cancel',
                                '</button>',
                            '</div>',
                            '<ion-content class="has-header has-header">',
                                '<ion-list>',
                                    '<ion-item ng-repeat="location in locations" type="item-text-wrap" ng-click="selectLocation(location)">',
                                        '{{location.formatted_address}}',
                                    '</ion-item>',
                                '</ion-list>',
                            '</ion-content>',
                        '</div>'
                    ].join('');

                    var popupPromise = $ionicTemplateLoader.compile({
                        template: POPUP_TPL,
                        scope: scope,
                        appendTo: $document[0].body
                    });

                    popupPromise.then(function(el){
                        var searchInputElement = angular.element(el.element.find('input'));

                        scope.selectLocation = function(location){
                            ngModelCtrl.$setViewValue(location);
                            ngModelCtrl.$render();
                            el.element.css('display', 'none');
                            $ionicBackdrop.release();

                            if (unbindBackButtonAction) {
                                unbindBackButtonAction();
                                unbindBackButtonAction = null;
                            }
                        };

                        scope.$watch('searchQuery', function(query){
                            if (searchEventTimeout) $timeout.cancel(searchEventTimeout);
                            searchEventTimeout = $timeout(function() {
                                if(!query) return;
                                if(query.length < 3);

                                var req = scope.geocodeOptions || {};
                                req.address = query;
                                geocoder.geocode(req, function(results, status) {
                                    if (status == google.maps.GeocoderStatus.OK) {
                                        scope.$apply(function(){
                                            scope.locations = results;
                                        });
                                    } else {
                                        // @TODO: Figure out what to do when the geocoding fails
                                    }
                                });
                            }, 350); // we're throttling the input by 350ms to be nice to google's API
                        });

                        var onClick = function(e){
                            e.preventDefault();
                            e.stopPropagation();

                            $ionicBackdrop.retain();
                            unbindBackButtonAction = $ionicPlatform.registerBackButtonAction(closeOnBackButton, 250);

                            el.element.css('display', 'block');
                            searchInputElement[0].focus();
                            setTimeout(function(){
                                searchInputElement[0].focus();
                            },0);
                        };

                        var onCancel = function(e){
                            scope.searchQuery = '';
                            $ionicBackdrop.release();
                            el.element.css('display', 'none');

                            if (unbindBackButtonAction){
                                unbindBackButtonAction();
                                unbindBackButtonAction = null;
                            }
                        };

                        closeOnBackButton = function(e){
                            e.preventDefault();

                            el.element.css('display', 'none');
                            $ionicBackdrop.release();

                            if (unbindBackButtonAction){
                                unbindBackButtonAction();
                                unbindBackButtonAction = null;
                            }
                        }

                        element.bind('click', onClick);
                        element.bind('touchend', onClick);

                        el.element.find('button').bind('click', onCancel);
                    });

                    if(attrs.placeholder){
                        element.attr('placeholder', attrs.placeholder);
                    }


                    ngModelCtrl.$formatters.unshift(function (modelValue) {
                        if (!modelValue) return '';
                        return modelValue;
                    });

                    ngModelCtrl.$parsers.unshift(function (viewValue) {
                        return viewValue;
                    });

                    ngModelCtrl.$render = function(){
                        if(!ngModelCtrl.$viewValue){
                            element.val('');
                        } else {
                            element.val(ngModelCtrl.$viewValue.formatted_address || '');
                        }
                    };

                    scope.$on("$destroy", function(){
                        if (unbindBackButtonAction){
                            unbindBackButtonAction();
                            unbindBackButtonAction = null;
                        }
                    });
                }
            };
        }
    ]);

body {
  cursor: url('http://ionicframework.com/img/finger.png'), auto;
}

.ion-google-place-container{
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 20;
    display: none;
}


input.ion-google-place[readonly]{
    background-color: transparent;
    cursor: text;
}

<link href="http://code.ionicframework.com/1.0.0-beta.13/css/ionic.css" rel="stylesheet"/>
<script src="http://code.ionicframework.com/1.0.0-beta.13/js/ionic.bundle.js"></script>
<script src="http://maps.googleapis.com/maps/api/js?libraries=places&sensor=false"></script>

<div><div ng-app="testApp">
  
<div >
      
<ion-content ng-controller="MyController" class="padding">
          <ion-google-place placeholder="Enter an address, Apt# and ZIP" ng-model="location" />
          <br>
          <br>
          {{change_location}}
          <br>
           <br>
          {{location}}
  
  <br>
  <br>
  {{msg}}
        </ion-content>
              </div>
    </div></div>