Question

我有三个带级联的kendo下拉列表，第一个和第二个是正确的，但第三个没有在页面加载时显示optionlabel。

imageOfDropDownList

正如您所看到的，“Ciudad”下拉列表未显示optionLabel，即使它具有它，如控制台中所示。

我不知道为什么会这样，因为它与kendo演示中的示例相同：

这是razor中的代码：

        <div class="baseControlsLine rowLineHeight lineMap">
            <div class="labelControlWith"> @Html.Label(@BackOffice.lblCountry + ":", htmlAttributes: new { @class = "baseLabel mapLabel" })</div>
            <div class="baseControlSmall">
                @(Html.Kendo().DropDownListFor(c => c.Customer.MapCountry)
                    .OptionLabel(BackOffice.txtSelectCountry)
                    .Events(e => e.Close("CustomerCreateEdit.CreateAddresMap").DataBound("CustomerCreateEdit.DataBound"))
                    .DataTextField("Text")
                    .DataValueField("Value").HtmlAttributes(new { @class = "baseTextbox" })
                    .DataSource(source => {
                        source.Read(read => {
                            read.Action(Constants.GET_COUNTRIES_SELECT_LIST, Constants.CUSTOMER_CONTROLLER);
                        });
                    }))
                @Html.ValidationMessageFor(model => model.Customer.MapCountry)
            </div>
        </div>
        <div class="baseControlsLine rowLineHeight lineMap">
            <div class="labelControlWith"> @Html.Label(@BackOffice.lblProvince + ":", htmlAttributes: new { @class = "baseLabel mapLabel" })</div>
            <div class="baseControlSmall">
                @(Html.Kendo().DropDownListFor(c => c.Customer.MapProvince)
                    .Events(e => e.Close("CustomerCreateEdit.CreateAddresMap"))
                    .OptionLabel(BackOffice.txtSelectProvince)
                    .DataTextField("Text")
                    .DataValueField("Value").HtmlAttributes(new { @class = "baseTextbox" })
                    .CascadeFrom("Customer_MapCountry")
                    .DataSource(source => {
                        source.Read(read => {
                            read.Action(Constants.GET_PROVINCES_SELECT_LIST, Constants.CUSTOMER_CONTROLLER).Data("CustomerCreateEdit.GetCountryId");
                        }).ServerFiltering(true);
                    }))
                @Html.ValidationMessageFor(model => model.Customer.MapProvince)
            </div>
        </div>
        <div class="baseControlsLine rowLineHeight lineMap">
            <div class="labelControlWith"> @Html.Label(@BackOffice.lblCity + ":", htmlAttributes: new { @class = "baseLabel mapLabel" })</div>
            <div class="baseControlSmall">
                @(Html.Kendo().DropDownListFor(c => c.Customer.MapCity)
                    .Events(e => e.Close("CustomerCreateEdit.CreateAddresMap"))
                    .OptionLabel(BackOffice.txtSelectCity)
                    .DataTextField("Text")
                    .DataValueField("Value").HtmlAttributes(new { @class = "baseTextbox" })
                    .CascadeFrom("Customer_MapProvince")
                    .DataSource(source => {
                        source.Read(read => {
                            read.Action(Constants.GET_CITIES_SELECT_LIST, Constants.CUSTOMER_CONTROLLER).Data("CustomerCreateEdit.GetProvinceId");
                        }).ServerFiltering(true);
                    }))
                @Html.ValidationMessageFor(model => model.Customer.MapCity)
            </div>
        </div>

这里是javascript的代码：

    GetCountryId: function () {
    /// <signature>
    ///   <summary>Devuelve el id del country para la cascada.</summary>
    /// </signature>
    return {
        id: $("#Customer_MapCountry").val()
    };
},
GetProvinceId: function () {
    /// <signature>
    ///   <summary>Devuelve el id de la provincia para la cascada.</summary>
    /// </signature>
    return {
        id: $("#Customer_MapProvince").val()
    };
},

这里是控制器：

    public JsonResult GetCitiesSelectList(int? id) {
        if (!id.HasValue)
            return Json(new SelectListItem() { Text = BackOffice.txtSelectCity }, JsonRequestBehavior.AllowGet);
        List<CityLanguage> listCity = _applicationCity.GetAllWithLanguage(id.Value).ToList();
        return Json(new SelectList(listCity, "IdCity", "Name"), JsonRequestBehavior.AllowGet);
    }
    public JsonResult GetProvincesSelectList(int? id) {
        if (!id.HasValue)
            return Json(new SelectListItem() { Text = BackOffice.txtSelectProvince }, JsonRequestBehavior.AllowGet);
        List<ProvinceLanguage> listProvince = _applicationProvince.GetAllWithLanguage(id.Value).ToList();
        return Json(new SelectList(listProvince, "IdProvince", "Name"), JsonRequestBehavior.AllowGet);
    }
    public JsonResult GetCountriesSelectList() {
        List<CountryLanguage> listCountryLanguage = _applicationCountry.GetAllWithLanguage().ToList();
        return Json(new SelectList(listCountryLanguage, "IdCountry", "Name"), JsonRequestBehavior.AllowGet);
    }

修改

我遇到了jquery版本的问题，我不得不按照这个顺序放置javascripts：

jquery的。剑道。 jQuery的UI。

错误是javascripts的顺序吗？

我还有一个jquery版本，它不是随剑道附带的版本。

可能有些事情导致了第三个下拉列表的奇怪行为？

Answer 1

您可以尝试使用Placeholder代替OptionLabel。

 @(Html.Kendo().DropDownListFor(c => c.Customer.MapCountry)
                    .Placeholder(BackOffice.txtSelectCountry)
                    .Events(e => e.Close("CustomerCreateEdit.CreateAddresMap").DataBound("CustomerCreateEdit.DataBound"))
                    .DataTextField("Text")
                    .DataValueField("Value").HtmlAttributes(new { @class = "baseTextbox" })
                    .DataSource(source => {
                        source.Read(read => {
                            read.Action(Constants.GET_COUNTRIES_SELECT_LIST, Constants.CUSTOMER_CONTROLLER);
                        });
                    }))

Kendo下拉列表级联第三级不显示optionlabel

1 个答案: