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Only one Grid-Detail page expanded at once on row click

Environment

Product Grid for Blazor

Description

I would like functionality where you close any detail page that is open if the customer open another one. So in any given situation, there will be only one detailpage open.

I also want to expand the detail template on row click, not (only) through the built-in expand button.

Solution

You can use the grid state to make sure only one item is expanded. You can also use the OnRead event to have an ordered list of the current page items so you can get the row index easily for use with the state. You can also use the grid events (OnRowClick and OnRowExpand) to call the logic that will change the grid state.

@using Telerik.DataSource.Extensions

<TelerikGrid Data="@CurrentSalesTeamMembers"
             OnRead="@OnReadHandler"
             TotalCount="@Total"
             OnRowClick="@OnRowClickHandler"
             OnRowExpand="@OnRowExpandHandler"
             @ref="@Grid"
             Pageable="true" PageSize="3" FilterMode="@GridFilterMode.FilterMenu" Sortable="true">
    <DetailTemplate>
        @{
            var employee = context as MainModel;
            <TelerikGrid Data="@employee.Orders" Pageable="true" PageSize="5">
                <GridColumns>
                    <GridColumn Field="OrderId"></GridColumn>
                    <GridColumn Field="DealSize"></GridColumn>
                </GridColumns>
            </TelerikGrid>
        }
    </DetailTemplate>
    <GridColumns>
        <GridColumn Field="Id"></GridColumn>
        <GridColumn Field="Name"></GridColumn>
    </GridColumns>
</TelerikGrid>

@code {
    List<MainModel> AllSalesTeamMembers { get; set; }
    List<MainModel> CurrentSalesTeamMembers { get; set; }
    int Total { get; set; }
    TelerikGrid<MainModel> Grid { get; set; }

    async Task EnsureOnlyCurrentRowExpanded(MainModel currItem)
    {
        int currentIndexOfItem = CurrentSalesTeamMembers.IndexOf(currItem);
        if (currentIndexOfItem > -1)
        {
            // use the current grid state to keep filters, sorts, paging and so on
            var state = Grid.GetState();
            // set only the current row to be expanded
            state.ExpandedRows = new List<int> { currentIndexOfItem };
            // Note: SetState() will call OnRead, so you may want to
            // consider raising flags and caching data if you want to reduce requests for remote data
            await Grid.SetState(state);
        }
    }

    async Task OnRowClickHandler(GridRowClickEventArgs args)
    {
        args.ShouldRender = true;
        await EnsureOnlyCurrentRowExpanded(args.Item as MainModel);
    }

    async Task OnRowExpandHandler(GridRowExpandEventArgs args)
    {
        args.ShouldRender = true;
        await EnsureOnlyCurrentRowExpanded(args.Item as MainModel);
    }

    async Task OnReadHandler(GridReadEventArgs args)
    {
        var dataSourceResult = AllSalesTeamMembers.ToDataSourceResult(args.Request);
        CurrentSalesTeamMembers = dataSourceResult.Data.Cast<MainModel>().ToList();
        Total = dataSourceResult.Total;
        await InvokeAsync(StateHasChanged);
    }

    // only models and data generation follow

    protected override void OnInitialized()
    {
        AllSalesTeamMembers = GenerateData();
    }

    private List<MainModel> GenerateData()
    {
        List<MainModel> data = new List<MainModel>();
        for (int i = 0; i < 15; i++)
        {
            MainModel mdl = new MainModel { Id = i, Name = $"Name {i}" };
            mdl.Orders = Enumerable.Range(1, 15).Select(x => new DetailsModel { OrderId = x, DealSize = x ^ i }).ToList();
            data.Add(mdl);
        }
        return data;
    }

    public class MainModel
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public List<DetailsModel> Orders { get; set; }
    }

    public class DetailsModel
    {
        public int OrderId { get; set; }
        public double DealSize { get; set; }
    }
}
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