How to call a javascript function from inside jQuery?

I am trying to clean up some code and separate it into different functions. Something is not working and I think it has to do with scope. I am trying to execute loadSubscriberList() from inside a jQuery change event listener.

showUserList: function (res) {
    $('#cvUser').append('<option value="">  - Select a user - </option ');
    $.each(res.UserList, function (key, value) {
        $('#cvUser').append('<option value="' + value.id + '">' + value.firstName + " " + value.lastName + " " + value.userid + '</option>');
    });

    $('#cvUser').on('keyup change', function () {
        if ($('#cvUser').val()) {
            $('#subscriberSelectView').html('');
            var showSubscribers = $($("#subscriberSelect").text());
            $("#subscriberSelectView").append(showSubscribers);
            this.loadSubscriberList();
        } else {
            $('#subscriberSelectView').html('');
        }
    });
},

loadSubscriberList: function () {
    var postData = {
        'usr': $('#cvUser').val()
    }

    appNS.tpmBase.ajaxReq(
        '',
        postData,
        '/rsc/cvr/gsl',
        null,
        null,
        $.proxy(this.handleShowUserList, this)
    )
},

Uncaught TypeError: this.loadSubscriberList is not a function