Razor dynamic drop down helper

DynamicDropDownsHelper.cshtml

@helper DynamicDropDowns() {
<script type="text/javascript">
    function listChanged($list, $target, url) {
        var listId = $list.val();
        if (listId == "") { // User selected first option, so clear and disable the list
            $target.empty();
            enableList($target, false);
            return;
        }
        $.getJSON(url, { id: listId }, function (data) {
            $target.empty(); // Clear the list
            $.each(data, function (idx, item) { // Add the data
                $target.append($("<option/>",
                {
                    value: item.Value,
                    text: item.Text
                }));
            });
            enableList($target, true); // Enable the list
        });
    }

    function enableList($list, enabled) {
        $list.attr("disabled", enabled ? null : "disabled");
    }
</script>
}