GridGroupFooterCommandContext.GroupRowVisibleIndex Property

Returns the visible index of the group row containing the target footer cell.

Namespace: DevExpress.Blazor

Assembly: DevExpress.Blazor.v25.2.dll

Declaration

public int GroupRowVisibleIndex { get; }

Property Value

Type	Description
Int32	A group row visible index.

Remarks

The DevExpress Blazor Grid allows you to display context menus with predefined and custom commands. Use the ContextMenus property to activate context menus for specific Grid elements. Handle the CustomizeContextMenu event to modify the menu item collection. Use the Context event argument to identify the target Grid element and obtain contextual information.

When the target element is a group footer cell, the Context property returns a GridGroupFooterCommandContext object. Use the object’s GroupRowVisibleIndex property to obtain the visible index of the group row containing the target footer cell.

Example

The following example adds a custom Collapse Group command to the group footer context menu:

Razor

@inject WeatherForecastService ForecastService

<DxGrid Data="@forecasts"
        ShowGroupPanel="true"
        ContextMenus="GridContextMenus.GroupFooter"
        CustomizeContextMenu="OnCustomizeContextMenu">
    <Columns>
        <DxGridSelectionColumn />
        <DxGridDataColumn FieldName=@nameof(WeatherForecast.TemperatureC) Caption="Temp. (C)" />
        <DxGridDataColumn FieldName=@nameof(WeatherForecast.TemperatureF) Caption="Temp. (F)" />
        <DxGridDataColumn FieldName=@nameof(WeatherForecast.Summary) Caption="Summary" GroupIndex="0" />
        <DxGridDataColumn FieldName=@nameof(WeatherForecast.Date) DisplayFormat="dd/MM/yyyy" />
    </Columns>
    <GroupSummary>
        <DxGridSummaryItem SummaryType="GridSummaryItemType.Count" FieldName="Date" FooterColumnName="Date" />
    </GroupSummary>
</DxGrid>

@code {
    private List<WeatherForecast>? forecasts;

    protected override async Task OnInitializedAsync() {
        forecasts = await ForecastService.GetForecastAsync();
    }
    void OnCustomizeContextMenu(GridCustomizeContextMenuEventArgs args) {
        if (args.Context is GridGroupFooterCommandContext footerContext) {
            args.Items.AddCustomItem(0, "Collapse Group", () => {
                footerContext.Grid.BeginUpdate();
                footerContext.Grid.CollapseGroupRow(footerContext.GroupRowVisibleIndex);
                footerContext.Grid.EndUpdate();
            });
        }
    }
}

WeatherForecast

using System;

public class WeatherForecast {
    public int ID { get; set; }
    public DateTime Date { get; set; }
    public int TemperatureC { get; set; }
    public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
    public string? Summary { get; set; }
}

WeatherForecastService

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;

public class WeatherForecastService {
    public readonly string[] Summaries = new[] {
        "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
    };
    private List<WeatherForecast>? Forecasts;
    public Task<List<WeatherForecast>> GetForecastAsync() {
        if (Forecasts == null) {
            var rnd = new Random();
            Forecasts = Enumerable.Range(1, 50).Select(index => new WeatherForecast {
                ID = index,
                Date = DateTime.Today.AddDays(index),
                TemperatureC = rnd.Next(-20, 55),
                Summary = Summaries[rnd.Next(Summaries.Length)]
            }).ToList();
        }
        return Task.FromResult(Forecasts);
    }
    public Task<List<WeatherForecast>> ChangeForecastAsync(WeatherForecast changed) {
        var originalForecast = Forecasts.FirstOrDefault(i => i.ID == changed.ID);
        if (originalForecast != null) {
            originalForecast.TemperatureC = changed.TemperatureC;
            originalForecast.Summary = changed.Summary;
            originalForecast.Date = changed.Date;
        } else {
            Forecasts.Add(changed);
        }
        return Task.FromResult(Forecasts);
    }
    public Task<List<WeatherForecast>> Remove(WeatherForecast forecast) {
        Forecasts.Remove(forecast);
        return Task.FromResult(Forecasts);
    }
}

Program.cs

// ...
builder.Services.AddSingleton<WeatherForecastService>();