Question

我有一个包含两组级联下拉列表的kendo网格：一个用于位置级别1到3，另一个用于类别级别1到3.在我的模型中，位置都不可为空，而对于类别级别2和级别3可以为空。

我使用内联编辑，所有组合都正确填充。但是，当我保存时，可以为空的组合框的选定值不包含在帖子中，并且ActionResult会为模型的这两个字段接收空值。

网格：

 @(Html.Kendo().Grid<Container>()
              .Name("ContainerGrid")
              .Columns(columns =>
              {
                  columns.Command(command => { command.Edit(); }).Width(150);                 
                  columns.ForeignKey(c => c.LocationLevel1Id, (System.Collections.IEnumerable)ViewData["locationLevel1"], "Id", "Text").EditorTemplateName("LocationLevel1Id");
                  columns.ForeignKey(c => c.LocationLevel2Id, (System.Collections.IEnumerable)ViewData["locationLevel2"], "Id", "Text").EditorTemplateName("LocationLevel2Id");
                  columns.ForeignKey(c => c.LocationLevel3Id, (System.Collections.IEnumerable)ViewData["locationLevel3"], "Id", "Text").EditorTemplateName("LocationLevel3Id");
                  columns.ForeignKey(c => c.CategoryLevel1Id, (System.Collections.IEnumerable)ViewData["catLevel1"], "Id", "Text").EditorTemplateName("CategoryLevel1Id");
                  columns.ForeignKey(c => c.CategoryLevel2Id, (System.Collections.IEnumerable)ViewData["catLevel2"], "Id", "Text").EditorTemplateName("CategoryLevel2Id");
                  columns.ForeignKey(c => c.CategoryLevel3Id, (System.Collections.IEnumerable)ViewData["catLevel3"], "Id", "Text").EditorTemplateName("CategoryLevel3Id");
              })
                 .ColumnMenu()
                .Editable(editable => editable.Mode(GridEditMode.InLine))             
                .Selectable(selectable => selectable.Mode(GridSelectionMode.Single))
                .DataSource(dataSource => dataSource
                    .Ajax()
                    .PageSize(100)
                    .Model(model =>
                    {
                        model.Id(a => a.Id);                      
                        model.Field(a => a.LocationLevel1Id);
                        model.Field(a => a.LocationLevel2Id);
                        model.Field(a => a.LocationLevel3Id);                      
                        model.Field(a => a.CategoryLevel1Id);
                        model.Field(a => a.CategoryLevel2Id);
                        model.Field(a => a.CategoryLevel3Id);
                    })
                    .Read(read => read.Action("Containers_Read", "ContainerAdmin").Data("filterInfo").Type(HttpVerbs.Get))
                    .Create(update => update.Action("Containers_Create", "ContainerAdmin"))
                    .Update(update => update.Action("Containers_Update", "ContainerAdmin"))
                )

        )

和模型：

public class Container
    {
        [Key]
        public Guid Id { get; set; }

        [ForeignKey("LocationLevel1")]
        public Guid LocationLevel1Id { get; set; }
        [JsonProperty(PropertyName = "locationLevel1")]
        public virtual Location LocationLevel1 { get; set; }

        [ForeignKey("LocationLevel2")]
        public Guid LocationLevel2Id { get; set; }
        [JsonProperty(PropertyName = "locationLevel2")]
        public virtual Location LocationLevel2 { get; set; }

        [ForeignKey("LocationLevel3")]
        public Guid LocationLevel3Id { get; set; }
        [JsonProperty(PropertyName = "locationLevel3")]
        public virtual Location LocationLevel3 { get; set; }

        [ForeignKey("CategoryLevel1")]
        public Guid? CategoryLevel1Id { get; set; }
        [JsonProperty(PropertyName = "categoryLevel1")]
        public virtual Category CategoryLevel1 { get; set; }

        [ForeignKey("CategoryLevel2")]
        public Guid? CategoryLevel2Id { get; set; }
        [JsonProperty(PropertyName = "categoryLevel2")]
        public virtual Category CategoryLevel2 { get; set; }

        [ForeignKey("CategoryLevel3")]
        public Guid? CategoryLevel3Id { get; set; }
        [JsonProperty(PropertyName = "categoryLevel3")]
        public virtual Category CategoryLevel3 { get; set; }

    }

如何将类别2级和3级值添加到ActionResult WITHOUT 将这些字段更改为不可空？

Answer 1

经过多次搜索，我在http://www.sitereq.com/post/kendo-mvc-dropdown-lists-inside-inline-kendo-mvc-grids

找到答案

照顾可以为空的模型属性
这是一个需要注意的重要注意事项。如果你的模型包含可空的 Kendo网格将是整数，浮点数或甚至字节类型的属性无法在创建时将模型属性更新为其值或编辑事件。这是Kendo网格中已知的一个让Kendo下降的错误列表在他们的编辑器模板中所以，如果是CompanyId Nullable而不是int然后解决这个问题你必须添加 “保存”事件到网格，如下面的列表
.Events(events =>
    {
        events.Save("EmployeesGrid_Save");
    })
其中EmployeesGrid_Save是将要处理的javascript处理程序网格保存事件。以下列表描述了如何保存处理程序将帮助网格保存下拉列表的值他们相应的可空属性。
function EmployeesGrid_Save(e) {
        var companyId = $("#CompanyId").data().kendoDropDownList.value();
        e.model.set("CompanyId", companyId);
    }

我实现了这个，它有效！

当绑定到可空字段时，Kendo网格中的级联下拉列表返回null

1 个答案: