Blazor Hierarchical Grid Virtualization and Performance

In Ignite UI for Blazor, the IgbHierarchicalGrid control virtualizes its content both vertically and horizontally.

Blazor Hierarchical Grid Virtualization and Performance Example

EXAMPLE

MODULES

DATA

RAZOR

JS

CSS

using System;
using System.Net.Http;
using System.Collections.Generic;
using System.Threading.Tasks;
using System.Text;
using Microsoft.AspNetCore.Components.WebAssembly.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using IgniteUI.Blazor.Controls; // for registering Ignite UI modules

namespace Infragistics.Samples
{
    public class Program
    {
        public static async Task Main(string[] args)
        {
            var builder = WebAssemblyHostBuilder.CreateDefault(args);
            builder.RootComponents.Add<App>("app");
            builder.Services.AddScoped(sp => new HttpClient { BaseAddress = new Uri(builder.HostEnvironment.BaseAddress) });
            // registering Ignite UI modules
            builder.Services.AddIgniteUIBlazor(
                typeof(IgbHierarchicalGridModule),
                typeof(IgbButtonModule)
            );
            await builder.Build().RunAsync();
        }
    }
}csCOPY CODE

using System;
using System.Collections.Generic;
public class SingersDataItem
{
    public double ID { get; set; }
    public string Artist { get; set; }
    public string Photo { get; set; }
    public double Debut { get; set; }
    public double GrammyNominations { get; set; }
    public double GrammyAwards { get; set; }
    public bool HasGrammyAward { get; set; }
    public List<SingersDataItem_ToursItem> Tours { get; set; }
    public List<SingersDataItem_AlbumsItem> Albums { get; set; }
}
public class SingersDataItem_ToursItem
{
    public string Tour { get; set; }
    public string StartedOn { get; set; }
    public string Location { get; set; }
    public string Headliner { get; set; }
    public string TouredBy { get; set; }
}
public class SingersDataItem_AlbumsItem
{
    public string Album { get; set; }
    public string LaunchDate { get; set; }
    public double BillboardReview { get; set; }
    public double USBillboard200 { get; set; }
    public string Artist { get; set; }
}

public class SingersData
    : List<SingersDataItem>
{
    public SingersData()
    {
        this.Add(new SingersDataItem()
        {
            ID = 0,
            Artist = @"Naomí Yepes",
            Photo = @"https://static.infragistics.com/xplatform/images/people/names/naomi.jpg",
            Debut = 2011,
            GrammyNominations = 6,
            GrammyAwards = 0,
            HasGrammyAward = false,
            Tours = new List<SingersDataItem_ToursItem>()
            {
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Faithful Tour",
                    StartedOn = @"Sep 12",
                    Location = @"Worldwide",
                    Headliner = @"NO",
                    TouredBy = @"Naomí Yepes"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"City Jam Sessions",
                    StartedOn = @"Aug 13",
                    Location = @"North America",
                    Headliner = @"YES",
                    TouredBy = @"Naomí Yepes"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Christmas NYC 2013",
                    StartedOn = @"Dec 13",
                    Location = @"United States",
                    Headliner = @"NO",
                    TouredBy = @"Naomí Yepes"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Christmas NYC 2014",
                    StartedOn = @"Dec 14",
                    Location = @"North America",
                    Headliner = @"NO",
                    TouredBy = @"Naomí Yepes"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Watermelon Tour",
                    StartedOn = @"Feb 15",
                    Location = @"Worldwide",
                    Headliner = @"YES",
                    TouredBy = @"Naomí Yepes"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Christmas NYC 2016",
                    StartedOn = @"Dec 16",
                    Location = @"United States",
                    Headliner = @"NO",
                    TouredBy = @"Naomí Yepes"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"The Dragon Tour",
                    StartedOn = @"Feb 17",
                    Location = @"Worldwide",
                    Headliner = @"NO",
                    TouredBy = @"Naomí Yepes"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Organic Sessions",
                    StartedOn = @"Aug 18",
                    Location = @"United States, England",
                    Headliner = @"YES",
                    TouredBy = @"Naomí Yepes"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Hope World Tour",
                    StartedOn = @"Mar 19",
                    Location = @"Worldwide",
                    Headliner = @"NO",
                    TouredBy = @"Naomí Yepes"
                }}
            ,
            Albums = new List<SingersDataItem_AlbumsItem>()
            {
                new SingersDataItem_AlbumsItem()
                {
                    Album = @"Initiation",
                    LaunchDate = @"September 3, 2013",
                    BillboardReview = 86,
                    USBillboard200 = 1,
                    Artist = @"Naomí Yepes"
                },
                new SingersDataItem_AlbumsItem()
                {
                    Album = @"Dream Driven",
                    LaunchDate = @"August 25, 2014",
                    BillboardReview = 81,
                    USBillboard200 = 1,
                    Artist = @"Naomí Yepes"
                },
                new SingersDataItem_AlbumsItem()
                {
                    Album = @"The dragon journey",
                    LaunchDate = @"May 20, 2016",
                    BillboardReview = 60,
                    USBillboard200 = 2,
                    Artist = @"Naomí Yepes"
                },
                new SingersDataItem_AlbumsItem()
                {
                    Album = @"Organic me",
                    LaunchDate = @"August 17, 2018",
                    BillboardReview = 82,
                    USBillboard200 = 1,
                    Artist = @"Naomí Yepes"
                },
                new SingersDataItem_AlbumsItem()
                {
                    Album = @"Curiosity",
                    LaunchDate = @"December 7, 2019",
                    BillboardReview = 75,
                    USBillboard200 = 12,
                    Artist = @"Naomí Yepes"
                }}

        });
        this.Add(new SingersDataItem()
        {
            ID = 1,
            Artist = @"Babila Ebwélé",
            Photo = @"https://static.infragistics.com/xplatform/images/people/names/babila.jpg",
            Debut = 2009,
            GrammyNominations = 0,
            GrammyAwards = 11,
            HasGrammyAward = true,
            Tours = new List<SingersDataItem_ToursItem>()
            {
                new SingersDataItem_ToursItem()
                {
                    Tour = @"The last straw",
                    StartedOn = @"May 09",
                    Location = @"Europe, Asia",
                    Headliner = @"NO",
                    TouredBy = @"Babila Ebwélé"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"No foundations",
                    StartedOn = @"Jun 04",
                    Location = @"United States, Europe",
                    Headliner = @"YES",
                    TouredBy = @"Babila Ebwélé"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Crazy eyes",
                    StartedOn = @"Jun 08",
                    Location = @"North America",
                    Headliner = @"NO",
                    TouredBy = @"Babila Ebwélé"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Zero gravity",
                    StartedOn = @"Apr 19",
                    Location = @"United States",
                    Headliner = @"NO",
                    TouredBy = @"Babila Ebwélé"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Battle with myself",
                    StartedOn = @"Mar 08",
                    Location = @"North America",
                    Headliner = @"YES",
                    TouredBy = @"Babila Ebwélé"
                }}
            ,
            Albums = new List<SingersDataItem_AlbumsItem>()
            {
                new SingersDataItem_AlbumsItem()
                {
                    Album = @"Pushing up daisies",
                    LaunchDate = @"May 31, 2000",
                    BillboardReview = 86,
                    USBillboard200 = 42,
                    Artist = @"Babila Ebwélé"
                },
                new SingersDataItem_AlbumsItem()
                {
                    Album = @"Death's dead",
                    LaunchDate = @"June 8, 2016",
                    BillboardReview = 85,
                    USBillboard200 = 95,
                    Artist = @"Babila Ebwélé"
                }}

        });
        this.Add(new SingersDataItem()
        {
            ID = 2,
            Artist = @"Ahmad Nazeri",
            Photo = @"https://static.infragistics.com/xplatform/images/people/names/ahmad.jpg",
            Debut = 2004,
            GrammyNominations = 3,
            GrammyAwards = 1,
            HasGrammyAward = true,
            Tours = new List<SingersDataItem_ToursItem>()
            {
            }
            ,
            Albums = new List<SingersDataItem_AlbumsItem>()
            {
                new SingersDataItem_AlbumsItem()
                {
                    Album = @"Emergency",
                    LaunchDate = @"March 6, 2004",
                    BillboardReview = 98,
                    USBillboard200 = 69,
                    Artist = @"Ahmad Nazeri"
                },
                new SingersDataItem_AlbumsItem()
                {
                    Album = @"Bursting bubbles",
                    LaunchDate = @"April 17, 2006",
                    BillboardReview = 69,
                    USBillboard200 = 39,
                    Artist = @"Ahmad Nazeri"
                }}

        });
        this.Add(new SingersDataItem()
        {
            ID = 3,
            Artist = @"Kimmy McIlmorie",
            Photo = @"https://static.infragistics.com/xplatform/images/people/names/kimmy.jpg",
            Debut = 2007,
            GrammyNominations = 21,
            GrammyAwards = 3,
            HasGrammyAward = true,
            Tours = new List<SingersDataItem_ToursItem>()
            {
            }
            ,
            Albums = new List<SingersDataItem_AlbumsItem>()
            {
                new SingersDataItem_AlbumsItem()
                {
                    Album = @"Here we go again",
                    LaunchDate = @"November 18, 2017",
                    BillboardReview = 68,
                    USBillboard200 = 1,
                    Artist = @"Kimmy McIlmorie"
                }}

        });
        this.Add(new SingersDataItem()
        {
            ID = 4,
            Artist = @"Mar Rueda",
            Photo = @"https://static.infragistics.com/xplatform/images/people/names/mar.jpg",
            Debut = 1996,
            GrammyNominations = 14,
            GrammyAwards = 2,
            HasGrammyAward = true,
            Tours = new List<SingersDataItem_ToursItem>()
            {
            }
            ,
            Albums = new List<SingersDataItem_AlbumsItem>()
            {
            }

        });
        this.Add(new SingersDataItem()
        {
            ID = 5,
            Artist = @"Izabella Tabakova",
            Photo = @"https://static.infragistics.com/xplatform/images/people/names/izabella.jpg",
            Debut = 2017,
            GrammyNominations = 7,
            GrammyAwards = 11,
            HasGrammyAward = true,
            Tours = new List<SingersDataItem_ToursItem>()
            {
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Final breath",
                    StartedOn = @"Jun 13",
                    Location = @"Europe",
                    Headliner = @"YES",
                    TouredBy = @"Izabella Tabakova"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Once bitten",
                    StartedOn = @"Dec 18",
                    Location = @"Australia, United States",
                    Headliner = @"NO",
                    TouredBy = @"Izabella Tabakova"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Code word",
                    StartedOn = @"Sep 19",
                    Location = @"United States, Europe",
                    Headliner = @"NO",
                    TouredBy = @"Izabella Tabakova"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Final draft",
                    StartedOn = @"Sep 17",
                    Location = @"United States, Europe",
                    Headliner = @"YES",
                    TouredBy = @"Izabella Tabakova"
                }}
            ,
            Albums = new List<SingersDataItem_AlbumsItem>()
            {
                new SingersDataItem_AlbumsItem()
                {
                    Album = @"Once bitten",
                    LaunchDate = @"July 16, 2007",
                    BillboardReview = 79,
                    USBillboard200 = 53,
                    Artist = @"Izabella Tabakova"
                },
                new SingersDataItem_AlbumsItem()
                {
                    Album = @"Your graciousness",
                    LaunchDate = @"November 17, 2004",
                    BillboardReview = 69,
                    USBillboard200 = 30,
                    Artist = @"Izabella Tabakova"
                },
                new SingersDataItem_AlbumsItem()
                {
                    Album = @"Dark matters",
                    LaunchDate = @"November 3, 2002",
                    BillboardReview = 79,
                    USBillboard200 = 85,
                    Artist = @"Izabella Tabakova"
                }}

        });
        this.Add(new SingersDataItem()
        {
            ID = 6,
            Artist = @"Nguyễn Diệp Chi",
            Photo = @"https://static.infragistics.com/xplatform/images/people/names/nguyen.jpg",
            Debut = 1992,
            GrammyNominations = 4,
            GrammyAwards = 2,
            HasGrammyAward = true,
            Tours = new List<SingersDataItem_ToursItem>()
            {
            }
            ,
            Albums = new List<SingersDataItem_AlbumsItem>()
            {
                new SingersDataItem_AlbumsItem()
                {
                    Album = @"Library of liberty",
                    LaunchDate = @"December 22, 2003",
                    BillboardReview = 93,
                    USBillboard200 = 5,
                    Artist = @"Nguyễn Diệp Chi"
                }}

        });
        this.Add(new SingersDataItem()
        {
            ID = 7,
            Artist = @"Eva Lee",
            Photo = @"https://static.infragistics.com/xplatform/images/people/names/eva.jpg",
            Debut = 2008,
            GrammyNominations = 2,
            GrammyAwards = 0,
            HasGrammyAward = false,
            Tours = new List<SingersDataItem_ToursItem>()
            {
            }
            ,
            Albums = new List<SingersDataItem_AlbumsItem>()
            {
                new SingersDataItem_AlbumsItem()
                {
                    Album = @"Just a tease",
                    LaunchDate = @"May 3, 2001",
                    BillboardReview = 91,
                    USBillboard200 = 29,
                    Artist = @"Eva Lee"
                }}

        });
        this.Add(new SingersDataItem()
        {
            ID = 8,
            Artist = @"Siri Jakobsson",
            Photo = @"https://static.infragistics.com/xplatform/images/people/names/siri.jpg",
            Debut = 1990,
            GrammyNominations = 2,
            GrammyAwards = 8,
            HasGrammyAward = true,
            Tours = new List<SingersDataItem_ToursItem>()
            {
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Basket case",
                    StartedOn = @"Jan 07",
                    Location = @"Europe, Asia",
                    Headliner = @"NO",
                    TouredBy = @"Siri Jakobsson"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"The bigger fish",
                    StartedOn = @"Dec 07",
                    Location = @"United States, Europe",
                    Headliner = @"YES",
                    TouredBy = @"Siri Jakobsson"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Missed the boat",
                    StartedOn = @"Jun 09",
                    Location = @"Europe, Asia",
                    Headliner = @"NO",
                    TouredBy = @"Siri Jakobsson"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Equivalent exchange",
                    StartedOn = @"Feb 06",
                    Location = @"United States, Europe",
                    Headliner = @"YES",
                    TouredBy = @"Siri Jakobsson"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Damage control",
                    StartedOn = @"Oct 11",
                    Location = @"Australia, United States",
                    Headliner = @"NO",
                    TouredBy = @"Siri Jakobsson"
                }}
            ,
            Albums = new List<SingersDataItem_AlbumsItem>()
            {
                new SingersDataItem_AlbumsItem()
                {
                    Album = @"Under the bus",
                    LaunchDate = @"May 14, 2000",
                    BillboardReview = 67,
                    USBillboard200 = 67,
                    Artist = @"Siri Jakobsson"
                }}

        });
        this.Add(new SingersDataItem()
        {
            ID = 9,
            Artist = @"Pablo Cambeiro",
            Photo = @"https://static.infragistics.com/xplatform/images/people/names/pablo.jpg",
            Debut = 2011,
            GrammyNominations = 5,
            GrammyAwards = 0,
            HasGrammyAward = false,
            Tours = new List<SingersDataItem_ToursItem>()
            {
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Beads",
                    StartedOn = @"May 11",
                    Location = @"Worldwide",
                    Headliner = @"NO",
                    TouredBy = @"Pablo Cambeiro"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Concept art",
                    StartedOn = @"Dec 18",
                    Location = @"United States",
                    Headliner = @"YES",
                    TouredBy = @"Pablo Cambeiro"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Glass shoe",
                    StartedOn = @"Jan 20",
                    Location = @"Worldwide",
                    Headliner = @"YES",
                    TouredBy = @"Pablo Cambeiro"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Pushing buttons",
                    StartedOn = @"Feb 15",
                    Location = @"Europe, Asia",
                    Headliner = @"NO",
                    TouredBy = @"Pablo Cambeiro"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Dark matters",
                    StartedOn = @"Jan 04",
                    Location = @"Australia, United States",
                    Headliner = @"YES",
                    TouredBy = @"Pablo Cambeiro"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Greener grass",
                    StartedOn = @"Sep 09",
                    Location = @"United States, Europe",
                    Headliner = @"NO",
                    TouredBy = @"Pablo Cambeiro"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Apparatus",
                    StartedOn = @"Nov 16",
                    Location = @"Europe",
                    Headliner = @"NO",
                    TouredBy = @"Pablo Cambeiro"
                }}
            ,
            Albums = new List<SingersDataItem_AlbumsItem>()
            {
                new SingersDataItem_AlbumsItem()
                {
                    Album = @"Fluke",
                    LaunchDate = @"August 4, 2017",
                    BillboardReview = 93,
                    USBillboard200 = 98,
                    Artist = @"Pablo Cambeiro"
                },
                new SingersDataItem_AlbumsItem()
                {
                    Album = @"Crowd control",
                    LaunchDate = @"August 26, 2003",
                    BillboardReview = 68,
                    USBillboard200 = 84,
                    Artist = @"Pablo Cambeiro"
                }}

        });
        this.Add(new SingersDataItem()
        {
            ID = 10,
            Artist = @"Athar Malakooti",
            Photo = @"https://static.infragistics.com/xplatform/images/people/names/athar.jpg",
            Debut = 2017,
            GrammyNominations = 0,
            GrammyAwards = 0,
            HasGrammyAward = false,
            Tours = new List<SingersDataItem_ToursItem>()
            {
            }
            ,
            Albums = new List<SingersDataItem_AlbumsItem>()
            {
                new SingersDataItem_AlbumsItem()
                {
                    Album = @"Pushing up daisies",
                    LaunchDate = @"February 24, 2016",
                    BillboardReview = 74,
                    USBillboard200 = 77,
                    Artist = @"Athar Malakooti"
                }}

        });
        this.Add(new SingersDataItem()
        {
            ID = 11,
            Artist = @"Marti Valencia",
            Photo = @"https://static.infragistics.com/xplatform/images/people/names/marti.jpg",
            Debut = 2004,
            GrammyNominations = 1,
            GrammyAwards = 1,
            HasGrammyAward = true,
            Tours = new List<SingersDataItem_ToursItem>()
            {
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Cat eat cat world",
                    StartedOn = @"Sep 00",
                    Location = @"Worldwide",
                    Headliner = @"YES",
                    TouredBy = @"Marti Valencia"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Final straw",
                    StartedOn = @"Sep 06",
                    Location = @"United States, Europe",
                    Headliner = @"NO",
                    TouredBy = @"Marti Valencia"
                }}
            ,
            Albums = new List<SingersDataItem_AlbumsItem>()
            {
                new SingersDataItem_AlbumsItem()
                {
                    Album = @"Nemesis",
                    LaunchDate = @"June 30, 2004",
                    BillboardReview = 94,
                    USBillboard200 = 9,
                    Artist = @"Marti Valencia"
                },
                new SingersDataItem_AlbumsItem()
                {
                    Album = @"First chance",
                    LaunchDate = @"January 7, 2019",
                    BillboardReview = 96,
                    USBillboard200 = 19,
                    Artist = @"Marti Valencia"
                },
                new SingersDataItem_AlbumsItem()
                {
                    Album = @"God's advocate",
                    LaunchDate = @"April 29, 2007",
                    BillboardReview = 66,
                    USBillboard200 = 37,
                    Artist = @"Marti Valencia"
                }}

        });
        this.Add(new SingersDataItem()
        {
            ID = 12,
            Artist = @"Alicia Stanger",
            Photo = @"https://static.infragistics.com/xplatform/images/people/names/alicia.jpg",
            Debut = 2010,
            GrammyNominations = 1,
            GrammyAwards = 0,
            HasGrammyAward = false,
            Tours = new List<SingersDataItem_ToursItem>()
            {
            }
            ,
            Albums = new List<SingersDataItem_AlbumsItem>()
            {
                new SingersDataItem_AlbumsItem()
                {
                    Album = @"Forever alone",
                    LaunchDate = @"November 3, 2005",
                    BillboardReview = 82,
                    USBillboard200 = 7,
                    Artist = @"Alicia Stanger"
                }}

        });
        this.Add(new SingersDataItem()
        {
            ID = 13,
            Artist = @"Peter Taylor",
            Photo = @"https://static.infragistics.com/xplatform/images/people/names/peter.jpg",
            Debut = 2005,
            GrammyNominations = 0,
            GrammyAwards = 2,
            HasGrammyAward = true,
            Tours = new List<SingersDataItem_ToursItem>()
            {
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Love",
                    StartedOn = @"Jun 04",
                    Location = @"Europe, Asia",
                    Headliner = @"YES",
                    TouredBy = @"Peter Taylor"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Fault of treasures",
                    StartedOn = @"Oct 13",
                    Location = @"North America",
                    Headliner = @"NO",
                    TouredBy = @"Peter Taylor"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"For eternity",
                    StartedOn = @"Mar 05",
                    Location = @"United States",
                    Headliner = @"YES",
                    TouredBy = @"Peter Taylor"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Time flies",
                    StartedOn = @"Jun 03",
                    Location = @"North America",
                    Headliner = @"NO",
                    TouredBy = @"Peter Taylor"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Highest difficulty",
                    StartedOn = @"Nov 01",
                    Location = @"Worldwide",
                    Headliner = @"YES",
                    TouredBy = @"Peter Taylor"
                },
                new SingersDataItem_ToursItem()
                {
                    Tour = @"Sleeping dogs",
                    StartedOn = @"May 04",
                    Location = @"United States, Europe",
                    Headliner = @"NO",
                    TouredBy = @"Peter Taylor"
                }}
            ,
            Albums = new List<SingersDataItem_AlbumsItem>()
            {
                new SingersDataItem_AlbumsItem()
                {
                    Album = @"Decisions decisions",
                    LaunchDate = @"April 10, 2008",
                    BillboardReview = 85,
                    USBillboard200 = 35,
                    Artist = @"Peter Taylor"
                },
                new SingersDataItem_AlbumsItem()
                {
                    Album = @"Climate changed",
                    LaunchDate = @"June 20, 2015",
                    BillboardReview = 66,
                    USBillboard200 = 89,
                    Artist = @"Peter Taylor"
                }}

        });
    }
}csCOPY CODE

@using IgniteUI.Blazor.Controls

<div class="container vertical ig-typography">
    <div class="container vertical fill">
        @*
        <IgbColumn Field="Artist" Header="Artist" HasSummary="true"></IgbColumn>
        <IgbColumn Field="Photo" Header="Photo" DataType="GridColumnDataType.Image"></IgbColumn>
        <IgbColumn Field="Debut" Header="Debut" HasSummary="true"></IgbColumn>
        <IgbColumn Field="GrammyNominations" Header="Grammy Nominations" DataType="GridColumnDataType.Number" HasSummary="true"></IgbColumn>
        <IgbColumn Field="GrammyAwards" Header="Grammy Awards" DataType="GridColumnDataType.Number" HasSummary="true"></IgbColumn> *@

        <IgbButton Focus="OnButtonFocus" Blur="OnButtonBlur">
            Clear Sort
        </IgbButton>
        <IgbHierarchicalGrid
            Id="hGrid"
            Height="600px"
            Data="SingersData"
            @ref="hierarchicalGrid"
            AutoGenerate="true"
            PrimaryKey="ID"
            ColumnInit="OnColumnInit"
            ColumnsAutogenerated="OnColumnsAutogenerated">

            <IgbRowIsland ChildDataKey="Albums" AutoGenerate="false" GridCreated="OnGridCreated">
                <IgbColumn Field="Album" Header="Album" DataType="GridColumnDataType.String"></IgbColumn>
                <IgbColumn Field="LaunchDate" Header="Launch Date" DataType="GridColumnDataType.Date"></IgbColumn>
                <IgbColumn Field="BillboardReview" Header="Billboard Review" DataType="GridColumnDataType.Number" HasSummary="true"></IgbColumn>
                <IgbColumn Field="USBillboard200" Header="US Billboard 200" DataType="GridColumnDataType.Number" HasSummary="true"></IgbColumn>

                <IgbRowIsland ChildDataKey="Songs" AutoGenerate="false">
                    <IgbColumn Field="Number" Header="No." DataType="GridColumnDataType.String"></IgbColumn>
                    <IgbColumn Field="Title" Header="Title" DataType="GridColumnDataType.String" HasSummary="true"></IgbColumn>
                    <IgbColumn Field="Released" Header="Released" DataType="GridColumnDataType.Date"></IgbColumn>
                    <IgbColumn Field="Genre" Header="Genre" DataType="GridColumnDataType.String"></IgbColumn>
                </IgbRowIsland>
            </IgbRowIsland>

            <IgbActionStrip Name="actionStrip1" >
                <IgbGridPinningActions>
                </IgbGridPinningActions>
            </IgbActionStrip>
        </IgbHierarchicalGrid>

    </div>
</div>

@code {
    
    private IgbHierarchicalGrid hierarchicalGrid;

    private SingersData _singersData = null;
    public SingersData SingersData
    {
        get
        {
            if (_singersData == null)
            {
                _singersData = new SingersData();
            }
            return _singersData;
        }
    }

    public async void OnGridCreated(IgbGridCreatedEventArgs args) {
        Console.Write("created");
    }

    public void OnColumnsAutogenerated(IgbColumnsAutoGeneratedEventArgs args)
    {
        Console.Write("autogenerated");
    }

    public async void OnColumnInit(IgbColumnComponentEventArgs args)
    {
        Console.Write("init");
        if (args.Detail.Header == "Artist")
        {
            args.Detail.Hidden = true;
        }
    }

    public void OnRowPinning(IgbPinRowEventArgs args)
    {
        Console.Write("pinned");
        args.Detail.Row.Unpin();
    }

    void OnButtonClick()
    {
        Console.WriteLine("click");
    }

    void OnButtonFocus()
    {
        Console.WriteLine("focus");
    }

    void OnButtonBlur()
    {
        Console.WriteLine("blur");
    }
}razorCOPY CODE

igRegisterScript("OnGridRendered", () => {
    const grid = document.getElementById("hGrid");

    grid.isLoading = true;

    getData({ parentID: null, rootLevel: true, key: "Customers" }).then(
        (data) => {
            grid.isLoading = false;
            grid.data = data;
            grid.markForCheck();
        });
}, false)

igRegisterScript("OnGridCreated", (args) => {
    const context = args.detail;
    const _parentKey = context.owner.childDataKey === "Orders" ? "Customers" : "Orders";
    const dataState = {
        key: context.owner.childDataKey,
        parentID: context.parentID,
        parentKey: _parentKey,
        rootLevel: false,
    };

    context.grid.isLoading = true;

    getData(dataState).then((data) => {
        context.grid.isLoading = false;
        context.grid.data = data;
        context.grid.markForCheck();
    });
}, false)

const DATA_URL = `https://data-northwind.indigo.design/`;

function getData(dataState) {
    return fetch(buildUrl(dataState))
        .then((result) => result.json());
}

function buildUrl(dataState) {
    let qS = "";
    if (dataState) {
        if (dataState.rootLevel) {
            qS += `${dataState.key}`;
        } else {
            qS += `${dataState.parentKey}/${dataState.parentID}/${dataState.key}`;
        }
    }
    return `${DATA_URL}${qS}`;
}jsCOPY CODE

/*
CSS styles are loaded from the shared CSS file located at:
https://static.infragistics.com/xplatform/css/samples/
*/
cssCOPY CODE

Enabling Virtualization

The IgbHierarchicalGrid now optimizes DOM rendering and memory consumption by rendering only what is currently visible in the view port and swapping the displayed data while the user scrolls the data horizontally/vertically. The IgbHierarchicalGrid's Width and Height defaults to 100% which will enable virtualization if the content displayed cannot fit inside the available space and scrollbars are required either vertically or horizontally.

However, it is also possible to explicitly set the IgbHierarchicalGrid's Width and/or Height to null which means that the related dimension will be determined by the total size of the items inside. No scrollbar will then be shown and all items will be rendered along the respective dimension (columns if Width is null and rows if Height is null).

The size of the data chunks is determined by:

• The row height for the vertical (row) virtualization. This is determined by the RowHeight option and is 50(px) by default.
• The individual column widths in pixels for the horizontal (column) virtualization. They can be determined by either setting explicit width for each column component or setting the IgbHierarchicalGrid's ColumnWidth option, which will be applied to all columns that don't have explicit width set.

In most cases, letting the grid apply its default behavior by leaving dimensions unset will produce the desired layout. For column widths it is determined by the column count, the columns with set width, and the calculated width of the IgbHierarchicalGrid's container. The grid will try to fit all columns inside the available space as long as the width it attempts to assign is not under 136(px). In such cases, columns with unassigned width will receive the minimum width of 136(px) and a horizontal scrollbar will be shown. The grid will be horizontally virtualized.

Explicitly setting column widths in percentages (%) will, in most cases, create a grid that is not virtualized horizontally as it will not have a horizontal scrollbar.

Templating

When needing to customize one of the existing templates in the grid, Blazor provides two possible ways to define a template:

• via a server-side template, using the related component property (i.e. BodyTemplate property) or declaratively with the template name. For example:

<IgbColumn>
    <BodyTemplate>
        Template content here
    </BodyTemplate>
</IgbColumn>
razor

This will render the template after first requesting and resolving it from the server.

• via a client-template using the Script equivalent of the property (i.e. BodyTemplateScript) to set it to the name of the client-side function handler, for example:

<IgbColumn BodyTemplateScript="CellTemplate">
</IgbColumn>
razor

igRegisterScript("CellTemplate", (ctx) => {
    var html = window.igTemplating.html;
    return html`Template content here`;
}, false);

javascript

The handler then renders the provided lit template directly in the DOM as needed.

While both approaches are valid, the server-side templates do require a round-trip request to the server to retrieve and resolve the custom template before rendering it on the client. As such the client-template approach is more optimized and recommended, especially in scenarios with many templates that need frequent updates as there may be a noticeable delay between the related user-interaction and the template updates.

Virtualization Limitations

• On Mac OS horizontal scrollbar is not visible when "Show scrollbars only when scrolling" system option is set to true (which is the default value). This is because the IgbHierarchicalGrid’s row container has an overflow set to hidden. Change the option to "Always" and the scrollbar will appear.

FAQ

Why is having dimensions in the Hierarchical Grid is necessary for virtualization to work?

Without information about the sizes of the container and the items before rendering them setting the width or height of a scrollbar or determining which of the items should be in the view when you scroll to a random location in the IgbHierarchicalGrid is erroneous. Any assumptions on what the actual dimensions might be could lead to unnatural behavior of the scrollbar and ultimately suboptimal experience for the end-user. This is why setting the related dimensions is enforced in order for virtualization to take effect.

API References

• IgbHierarchicalGrid
• IgbColumn

Additional Resources

• Paging
• Filtering
• Sorting
• Summaries
• Column Moving
• Column Pinning
• Column Resizing
• Selection

Our community is active and always welcoming to new ideas.

• Ignite UI for Blazor Forums
• Ignite UI for Blazor GitHub