function NmbrsController(NmbrsView) {

        NmbrsView.UrenCodeBox().on("change", UrenCodeBoxChangeCallback)
        function UrenCodeBoxChangeCallback() {
            SetKlant(); // old code
            if ($(this).val() == "240f06ee-158e-423e-89ca-a7bc99b2073e") {
                SearchForRuns(NmbrsView.SelectedRelatie())
                //SearchForRuns()
            }
            SetKlant(); // old code
        };

        function SearchForRuns(SelectedRelatie) {
            console.log(SelectedRelatie)
        }
    };
    function NmbrsView() {
        function UrenCodeBox() { return $("select#activiteiten_lijst") };
        this.UrenCodeBox = UrenCodeBox;

        function RelatieBox() { return $("select#klant"); };
        this.SelectedRelatie = function(){ return RelatieBox().val(); }
    };

    new NmbrsController(new NmbrsView() )