问jquery ui可排序的angularjs，如何防止水平拖放？轴:Y不工作

EN

$scope.sortableOptions = {
            start: function(e, ui) {
                $(this).attr('data-previndex', ui.item.index());
            },
            update: function(e, ui) {
                $(this).removeAttr('data-previndex');
            },
            receive: function(e, ui) {
            },
            stop: function(event, ui) {
                var val = ui.item.attr("val");
                $("#list"+val+" li").each(function(i, el){
                    $scope.updateTop(val,el.id,i);
                });
                $("#list"+val+"sub li").each(function(i, el){
                    $scope.updateBottom(val,el.id);
                });
            },
            connectWith: ".group",
            axis: 'y',
            placeholder: 'placeholder',
            helper: "clone",
            dropOnEmpty: true,
        };

    <div class="row">
    <div class="col-md-12 sortable">
        <table cellpadding="0" cellspacing="0">
            <td ng-repeat="amount_info in amount_data" valign="top" width="300">
                    <!--sort list-->
                    <ul ui-sortable="sortableOptions" id="list{{amount_info.amount}}" class="group so_list{{amount_info.amount}}" ng-model="amount_info.sortList" >
                        <li ng-mouseup="mouseUp(sortItem.ProductId,amount_info.amount)" amount="{{amount_info.amount}}" ng-repeat="sortItem in amount_info.sortList track by $index" ProductId="{{sortItem.ProductId}}" id="prod_{{sortItem.ProductId}}">
                        <div id="tc_prod">
                                {{sortItem.Product}} [{{sortItem.ProductId}}] 
                            </div>
                        </li>
                    </ul>
                    <div class="listdivide"></div>
                    <ul ui-sortable="sortableOptions" id="list{{amount_info.amount}}sub" class="group so_list{{amount_info.amount}}"  ng-model="amount_info.nonSortList" >
                        <li  ng-repeat="nonsortItem in amount_info.nonSortList track by $index" productId="{{nonsortItem.ProductId}}" id="prod_{{nonsortItem.ProductId}}" amount="{{amount_info.amount}}">
                            {{nonsortItem.Product}} [{{nonsortItem.ProductId}}]
                        </li>
                    </ul>
                </div>
            </td>
        </table>
    </div>
</div>