Ng-options not working

ionic-v1
1

Hi!

I have a JSON array and i’m trying to get in a drop down menu

html:

  <label class="item item-select " id="nieuweTicket-select2">
                <span class="input-label">Klant</span>
                <select ng-options="klant.custId for klant in Klanten">
                  <!--<option ng-model="Klant" ng-repeat="Klant in Klanten" value=""></option> -->
                </select>
            </label>

Controller:

.controller('nieuwCtrl', function($scope, KlantenService, $q){
  $scope.Klanten =  [];



  var deferred = $q.defer();
  deferred.promise.then(function(){
  });

  KlantenService.getKlanten().then(function(data){
    $scope.Klanten = data.data;
    console.log(data.data);

    deferred.resolve();
  }).catch(function(err){
    $scope.Klanten = [{"custId":"ERROR"}];
      deferred.resolve();
  });

  $scope.Toevoegen = function() {
 var Omschrijving = $scope.Omschrijving;
 var Klant = $scope.Klant
})

Service:

.service('KlantenService', function ($http){
    this.getKlanten = function()
    {
      return  $http.get('http://192.168.0.110/Ticketing/Klanten.php');
    }
    })

JSON:

[{"custId":"16"},{"custId":"17"},{"custId":"20"},{"custId":"21"},{"custId":"23"},{"custId":"24"},{"custId":"25"},{"custId":"26"},{"custId":"31"},{"custId":"43"},{"custId":"44"},{"custId":"49"},{"custId":"50"},{"custId":"51"},{"custId":"52"},{"custId":"54"},{"custId":"55"},{"custId":"56"},{"custId":"57"},{"custId":"58"},{"custId":"61"},{"custId":"62"},{"custId":"63"},{"custId":"64"},{"custId":"65"},{"custId":"66"},{"custId":"67"},{"custId":"68"},{"custId":"69"},{"custId":"70"},{"custId":"71"},{"custId":"72"},{"custId":"73"},{"custId":"74"},{"custId":"75"},{"custId":"76"},{"custId":"77"},{"custId":"78"},{"custId":"79"},{"custId":"80"},{"custId":"81"},{"custId":"82"},{"custId":"83"}]

If I use ng-repeat, I do get the custId’s in my dropdown but they have no value.
Any idea on how to solve this?