Input field should not clear after submit using angularjs

HTML

<form ng-controller="updatecontroller" ng-submit="updateUser()"><label class="control-label">First Name</label>
    <input type="text"  ng-model="user.userFirstName">
    <label class="control-label">Last Name</label>
    <input type="text"  ng-model="user.userLastName" ><button type="submit" ng-click="updateUser()">Update</button>
</form> 

JS

app.controller('updatecontroller', function ($scope, $http, $cookieStore) {

$http.get('http://localhost:8080/myapp/user/'.concat($scope.getUserId) + '?access_token=' + $cookieStore.get("access_token")).
        then(function (response) {
            $scope.user = response.data;
        });$scope.user = {"id": "","userFirstName": "","userLastName": ""}

$scope.updateUser = function () {

    var url = "http://localhost:8080/myapp/user/".concat($scope.getUserId) + "?access_token=" + $cookieStore.get("access_token");
    var method = "PUT";
    $http({
        method: method,
        url: url,
        data: angular.toJson($scope.user),
        headers: {
            'Content-Type': 'application/json'
        }
    })
};});

values will appear in text field. i have to update. the values are getting updated in database. but what i want is.. the updated values should not clear after submit the form.

Thanks!