AngularJS textbox value returns undefined

Question

When I press my button, I want to print the value of my textbox in my console. But my textbox returns a undefined. It seems that all of the code are working perfect, I did it the same way as some other code I used before, but it isn't working now.

This is my html code:

<form class="form-horizontal">    
     <input type="text" ng-model="add" ng-model-instant><button class="btn" ng-click="order()"><i class="icon-plus"></i>Order!</button>
</form>

This is my script:

angular.module('MyApp', []).
config(function($routeProvider) {
    $routeProvider.  
        when('/boeken', {templateUrl:'partials/boeken.html', controller:BoekenCtrl}).
        when('/orders', {templateUrl:'partials/orders.html', controller:OrderCtrl}).
        when('/home', {templateUrl:'partials/home.html', controller:HomeCtrl}).
        otherwise({redirectTo:'/home'});
});

//BoekenCtrl

//HomeCtrl

function OrderCtrl($rootScope) {    
    $rootScope.order = function() { console.log($rootScope.add); $rootScope.add = "";     };
}

Why is it that my textbox is undefined?

Answer 1

Instead

function OrderCtrl($rootScope) {    
$rootScope.order = function() { console.log($rootScope.add); $rootScope.add = "";     };
}

use:

function OrderCtrl($scope) {    
$scope.order = function() {
    console.log($scope.add);
    $scope.add = "";
 };
}

Since your form exists under OrderCtrl, you need to use $scope into OrderCtrl controller to fetch any data. But, sure, you can store it after in $rootScope

Please, see the example in Fiddle