[Solved] Next/Previous Appointment

[Adam Nelson]

Is there a way (client side or server) for the scheduler to find the next or previous appointment and change the selected date to that appointment for easy navigation.

[Dimitar Milushev]

Hi Adam Nelson,

There is no integrated way to do this with RadScheduler, but you can easily add two buttons to your page that navigate from the current date to the next/previous appointment.

The only tricky part is sorting the Appointments, because you need a custom comparer. Here is the code to implement one:

class AppointmentComparer : IComparer
{
    public int Compare(object x, object y)
    {
        Appointment first = x as Appointment;
        Appointment second = y as Appointment;

        if (first == null || second == null)
        {
            throw new InvalidOperationException("Can't compare null object(s).");
        }

        if (first.Start < second.Start)
        {
            return -1;
        }

        if (first.Start > second.Start)
        {
            return 1;
        }

        if (first.End > second.End)
        {
            return -1;
        }

        return 0;
    }
}

After you have the AppointmentComparer, in the button's click handler you just need to sort the appointments and find the nearest next Appointment:

protected void Button1_Click(object sender, EventArgs e)
{
    Appointment[] appointments = RadScheduler1.Appointments.ToArray();
    Array.Sort(appointments, new AppointmentComparer());

    foreach (Appointment appointment in appointments)
    {
        DateTime appointmentStart = RadScheduler1.UtcToDisplay(appointment.Start);
        if (appointmentStart > RadScheduler1.SelectedDate)
        {
            RadScheduler1.SelectedDate = appointmentStart.Date;
            break;
        }
    }
}

For the "Previous" button, just switch the 'if' to check if appointmentStart is before SelectedDate:

    if (appointmentStart < RadScheduler1.SelectedDate)

Greetings,
Dimitar Milushev
the Telerik team

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[Adam Nelson]

Thank you very much for the feedback.

It worked for the most part.

I had to add

Array.Reverse(appointments)

after the sort for the "Previous" button otherwise it would always set the selected date to the very first appointment.