Kendo UI dropdownlist 获取选中数据

下拉框 

<input id="Exp_Position" inputRequired="required" onblur="inputRequiredChange(this)"
                                               data-role="dropdownlist"
                                               data-text-field="Exp_PositionName"
                                               data-value-field="Exp_PositionID"
                                               data-bind="value:expenseApply.Exp_PositionID, source:PositionResource,events:{change:PositionChange}">
                                        <span class='k-widget k-tooltip k-tooltip-validation field-validation-error k-required' 

数据绑定

PositionResource: new kendo.data.DataSource({
            transport: {
                read: {
                    url: "/BaseData/PositionList"
                }
            },
            requestEnd: function (res) {
            }
        }),

当下拉框数据改变，获取选中的下拉框值 

        //职务改变
        PositionChange: function (res) {
            var senectData = res.sender.dataItem(res.sender.select());
            expenseApplyCreateViewModel.expenseApply.set("Exp_PositionID", senectData.Exp_PositionID);
            expenseApplyCreateViewModel.expenseApply.set("Exp_PositionName", senectData.Exp_PositionName);
        },