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Virtual Scrolling in ASP.NET MVC Schedule control

To achieve better performance in the Scheduler when loading a large number of resources and events, we have added virtual scrolling support in the timeline views to load a large set of resources and events instantly as you scroll. You can dynamically load large number of resources and events in timeline view of the Scheduler by setting true to the AllowVirtualScrolling property within the timeline view-specific settings. The virtual loading of events is possible in Agenda view, by setting AllowVirtualScrolling property to true within the agenda view specific settings.

razor
data.cs
@using Syncfusion.EJ2.Schedule

@(Html.EJS().Schedule("schedule")
    .Width("100%")
    .Height("650px")
    .SelectedDate(new DateTime(2018, 4, 1))
    .CurrentView(View.TimelineMonth)
    .Views(view => {
        view.Option(View.TimelineMonth).AllowVirtualScrolling(true).Add();
    })
    .Group(group => group.EnableCompactView(false).Resources(ViewBag.Resource))
    .Resources(res => {
        res.DataSource(ViewBag.resourcesData).Field("ResourceId").Title("Resource").Name("Resources").TextField("Text").IdField("Id").ColorField("Color").AllowMultiple(true).Add();
    })
    .EventSettings(new ScheduleEventSettings { DataSource = ViewBag.datasource })
    .Render()
)
public ActionResult Index()
{
    ViewBag.datasource = this.generateStaticEvents(new DateTime(2018, 4, 1), 300, 12);
    ViewBag.resourcesData = this.GenerateResourceData(1, 300);
    string[] resources = new string[] { "Resources" };
    ViewBag.Resource = resources;
    return View();
}
private List<ResourceData> GenerateResourceData(int start, int end)
{
    List<ResourceData> resources = new List<ResourceData>(300);
    var colors = new string[] { "#ff8787", "#9775fa", "#748ffc", "#3bc9db", "#69db7c",
    "#fdd835", "#748ffc", "#9775fa", "#df5286", "#7fa900",
    "#fec200", "#5978ee", "#00bdae", "#ea80fc"};
    for (int a = start; a <= end; a++)
    {
        int index = a % colors.Length;
        index = index == 0 ? (colors.Length / a):index;  
        resources.Add(new ResourceData
        {
            Id = a,
            Text = "Resource " + a,
            Color = colors[index]
        });
    }
    return resources;
}
private List<EventData> generateStaticEvents(DateTime date, int v1, int v2)
{
    List<EventData> data = new List<EventData>(3600);
    var id = 1;
    for (var i = 0; i < 300; i++)
    {
        Random random= new Random();
        List<int> listNumbers = new List<int>();
        int[] randomCollection = new int[24];
        int number;
        int max = 30;
        for (int a = 0; a < 12; a++)
        {
            do
            {
                number = random.Next(max);
            } while (listNumbers.Contains(number));
            listNumbers.Add(number);                    
            var startDate = date.AddDays(number);
            startDate = startDate.AddMilliseconds((((number % 10) * 10) * (1000 * 60)));
            var endDate = startDate.AddMilliseconds(((1440 + 30) * (1000 * 60)));
            data.Add(new EventData
            {
                Id = id,
                Subject = "Event #" + id,
                StartTime = startDate,
                EndTime = endDate,
                IsAllDay = (id % 10 == 0) ? false : true,
                ResourceId = i + 1
            });
            id++;
        }              
    }
    return data;
}
class EventData
{
    public int Id { get; set; }
    public string Subject { get; set; }
    public DateTime StartTime { get; set; }
    public DateTime EndTime { get; set; }
    public bool IsAllDay { get; set; }
    public int ResourceId { get; set; }
}

class ResourceData
{
    public int Id { get; set; }
    public string Text { get; set; }
    public string Color { get; set; }
}

For now, the virtual loading of resources and events is available only for timeline views. In the future, we plan to port the same virtual loading on all other applicable Scheduler views.