Add change amount and change the Total in Check Box in Ionic - angularjs

Question

I created a list in Checkbox, listing products where the user can choose a product. I need add in the product list an option where the user can change the quantity of products selected. How I can do it?
My View:
<ion-view view-title="Bebidas Adicionais" ng-controller="exBebidasCtrl" >
<div class="bar bar-subheader">
<h2 class="title">{{'Sub-Total R$ ' + getTotalSelected()}}</h2>
</div>
<ion-refresher pulling-text="Puxe para atualizar..." on-refresh="doRefresh()"></ion-refresher>
<ion-list class="card list">
<div class="item item-input">
<i class="icon ion-search placeholder-icon"></i>
<input type="search" ng-model="q" placeholder="Procurar" aria-label="filter bebidasextras" />
</div>
</ion-list>
<ion-list>
<div ng-repeat="bebida in bebidasextras">
<ion-checkbox ng-model="bebida.selected" >
<h2>{{bebida.ad_bebida_titulo}}</h2>
<p>R$ {{bebida.ad_bebida_valor}}</p>
</ion-checkbox>
</div>
</ion-list>
<button class="button button-block button-balanced">
<a ng-click="addToCart(bebida.ad_bebida_titulo,bebida.ad_bebida_valor)" class="button button-assertive button-clear icon ion-android-cart"> Continuar Comprando </a>
</button>
</ion-content>
My Controller:
$scope.bebidasextras = [];
var promise = $http.get('http://nhac.esy.es/api_carrinho/lista_bebida_extra.php?json=restaurantes')
.success(function(retorno) {
console.log(retorno);
$scope.bebidasextras = retorno; // não precisa fazer retorno.data
$scope.user = {
bebidasextras: [$scope.bebidasextras[1]]
};
$scope.checkAll = function() {
$scope.user.bebidasextras = angular.copy($scope.bebidasextras);
};
$scope.uncheckAll = function() {
$scope.user.bebidasextras = [];
};
$scope.checkFirst = function() {
$scope.user.bebidasextras = [];
$scope.user.bebidasextras.push($scope.bebidasextras[0]);
};
$scope.setToNull = function() {
$scope.user.bebidasextras = null;
};
$scope.getTotalSelected = function() {
var total = 0;
for(var i = 0; i < $scope.bebidasextras.length; i++){
var bebida = $scope.bebidasextras[i];
total += bebida.selected ? Number(bebida.ad_bebida_valor) : 0;
}
return total;
}
})
.error(function(erro) {
console.log(erro);
});

Answer 1

You can have an input box having a + and - button. Clicking upon which user can change the quantity of product selected.
If you can share some more details probably I would be able to answer in a better way.