在 Kendo UI 中使用父网格的数据源设置子网格的数据源

Question

我有这个表格：

@*Some form fields here that accept startDate and endDate*@

<div>
    <button id="searchButton">Search</button>
</div>
<div class="col-md-12 row">
    @(Html.Kendo()
            .Grid<ProjectName.DataModels.Models.Customer>()
            .Name("CustomerGrid")
            .Columns(columns =>
            {
                columns.Bound(e => e.CustomerId);
                columns.Bound(e => e.SomeCustomerColumn);
            })
            .ClientDetailTemplateId("OrderDetails")
            .AutoBind(false) // Don't load the data yet because I'll need to supply parameters for the fetch
            .DataSource(dataSource => dataSource
                        .Ajax()
                        .Events(events=>events.Change("loadChildGrid"))
                        .PageSize(20)
                        .Model(model => model.Id("CustomerId", typeof(string)))
                        .Read(read => read.Action("GetCustomersAsync", "Customer").Data("passArguments"))
            )
    )

    <script id="OrderDetails" type="text/kendo-tmpl">
        @(Html.Kendo()
                .Grid<ProjectName.DataModels.Models.Order>()
                .Name("OrderDetails_#=CustomerId#")
                .Columns(columns =>
                {
                    columns.Bound(o => o.ProductName);
                    columns.Bound(o => o.SomeOrderColumn);
                })
                .DataSource(dataSource => dataSource
                            .Ajax()
                            .PageSize(10)
                            .Model(model=>model.Id("OrderId"))
                            .ServerOperation(false)
                )
                .AutoBind(false)
                .ToClientTemplate()
        )
    </script>
</div>
 
<script type="text/javascript">
    $("#searchButton").on("click", function () {
        // Load the customerGrid here:
        $("#CustomerGrid").data("kendoGrid").dataSource.read();
    });
    
    function passArguments() {
        var startDate = $("#startdate").data("kendoDatePicker").value();
        var endDate = $("#enddate").data("kendoDatePicker").value();
        return {
            start: startDate,
            end: endDate
        }
    }
    
    // QUESTION: How to load the child grid: OrderDetails_123 by using datasource from the parent grid?
    // THIS IS WHAT I'VE TRIED SO FAR:
    function loadChildGrid() {
        var parentData = $("#CustomerGrid").data("kendoGrid").dataSource.data();
        //Initialize the  child grid
        $.each(parentData, childDataFeeder);
    }
    
    function childDataFeeder(index, item) {
        var childGridName = "#" + "OrderDetails_" + item.CustomerId;
        var childGrid = childGridName.data("kendoGrid");
        childGrid.dataSource.data(value.Orders)
    }
</script>

以及 Customer 控制器中的一个方法：

public async Task<ActionResult> GetCustomersAsync([DataSourceRequest] DataSourceRequest request, DateTime start, DateTime end)
{
    var customersWithOrders = GetDataForParentAndChildGrid(start, end);
    return Json(customersWithOrders.ToDataSourceResult(request));
}

private List<Customer> GetDataForParentAndChildGrid(DateTime start, DateTime end)
{
    var testData = new List<Customer>();
    // Gets required data with those dates filter and perform some mathematical calculations
    testData.Add(new Customer
    {
        CustomerId = "123",
        SomeCustomerColumn = "Blah blah",
        Orders = new List<Order>()
        {
            new Order{
                OrderId = "123ABC",
                CustomerId = "123",
                SomeOrderColumn = "Blah Blah Blah"
            }
        }
    });
    return testData;
}

我的目标是使用主网格中已有的数据设置子网格的数据源。到目前为止我已经尝试过的是我已经将 Change 事件附加到触发 loadChildGrid 函数的主网格，我尝试从主网格中提取数据并将它的每个项目传递给 childDataFeeder函数初始化子网格的数据源。这里的问题是，当它尝试这样做时，子网格尚不存在（因为它不是由 Kendo 创建的，直到用户单击主网格中的展开图标）。

您可以看到到目前为止我在 childDataFeeder 方法中尝试过的内容（没有任何成功）。因此，非常感谢您对此的指导。

谢谢！

Answer 1

经过这么多小时的命中和试用，终于解决了。所以我把它贴在这里是为了在别人遇到类似问题时节省他们的时间：

我在主网格中添加了一个 DetailExpand 事件。并删除了 dataSource 上的 Change 事件。

@(Html.Kendo()
        .Grid<ProjectName.DataModels.Models.Customer>()
        .Name("CustomerGrid")
        .Columns(columns =>
        {
            columns.Bound(e => e.CustomerId);
            columns.Bound(e => e.SomeCustomerColumn);
        })
        .ClientDetailTemplateId("OrderDetails")
        .AutoBind(false) // Don't load the data yet because I'll need to supply parameters for the fetch
        .DataSource(dataSource => dataSource
                    .Ajax()
                    .PageSize(20)
                    .Model(model => model.Id("CustomerId", typeof(string)))
                    .Read(read => read.Action("GetCustomersAsync", "Customer").Data("passArguments"))
        )
        .Events(events => events.DataBound("dataBound").DetailExpand("onExpand"))
)

现在，每次我们在父网格中展开一行时，都会调用名为 onExpand 的回调函数。这是我现在将设置子网格的 dataSource.

的地方

// Passing e is also important here because if you don't, this callback gets called 
// for every row in the main grid (even when you don't expand them!)
function onExpand(e) {
    var customerId = e.sender.dataItem(e.masterRow).CustomerId;
    var orders = e.sender.dataItem(e.masterRow).Orders;
    //Initialize the  child grid as well
    var childGridName = "#" + "OrderDetails_" + customerId;

    var childGrid = $(childGridName).data("kendoGrid");
    if (childGrid !== undefined) {
        childGrid.dataSource.data(orders);
    }
}

function dataBound() {
    this.expandRow(this.tbody.find("tr.k-master-row").first());
}

我使用 e.sender.dataItem(e.masterRow).PROPERTYNAME 从主行访问我需要的属性。

现在可以完美运行了！

在 Kendo UI 中使用父网格的数据源设置子网格的数据源

Set datasouce of child grid using datasource of parent grid in Kendo UI

javascript

c#

.net-core

kendo-grid

kendo-ui-mvc