Tuesday, September 22, 2015

Asp.net calendar control properties and events

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Useful Properties of the Calendar control
Caption - This is a string read/write property. 
CaptionAlign - Used to align the caption.
DayHeaderStyle - Style properties that can be used to customize the look and feel of the day header in the calendar
DayNameFormat - Can be Full, Short, FirstLetter, FirstTwoLetters, Shortest
DayStyle - Style properties that can be used to customize the look and feel of the day in the calendar
FirstDayOfWeek - Which day of the week is displayed first
NextPrevFormat - Can be ShortMonth, FullMonth, CustomText
NextMonthText - The text to use for the next month button. 
PrevMonthText - The text to use for the previous month button. 
SelectionMode - Can be Day, DayWeek, DayWeekMonth. Determines if Days, Weeks and Months are selectable.



If the SelectionMode is set to Day, then the user can select only one day. In this case to retrieve the selected date, we use SelectedDate property of the calendar as shown below.
Response.Write(Calendar1.SelectedDate.ToShortDateString());

However, if the SelectionMode is set to DayWeek or DayWeekMonth. In this case of you want to retrieve all the selected dates within the selected week or month, then SelectedDates property can be used as shown below. Using SelectedDate, property returns only the first selected date of the week or month.
foreach (DateTime selectedDate in Calendar1.SelectedDates)
{
    Response.Write(selectedDate.ToShortDateString() + "<br/>");
}

Events:
SelectionChanged - Fires when the date,week or Month selection is changed, by the user.
protected void Calendar1_SelectionChanged(object sender, EventArgs e)
{
    foreach (DateTime selectedDate in Calendar1.SelectedDates)
    {
        Response.Write(selectedDate.ToShortDateString() + "<br/>");
    }
}



DayRender - Fires as a day in the calendar control is being rendered.
protected void Calendar1_DayRender(object sender, DayRenderEventArgs e)
{
    if (!e.Day.IsOtherMonth && e.Day.Date.Day % 2 == 0)
    {
        e.Cell.Text = "x";
        e.Cell.Font.Bold = true;
        e.Cell.ForeColor = System.Drawing.Color.White;
        e.Cell.BackColor = System.Drawing.Color.Red;
        e.Cell.ToolTip = "Booked";
    }
    else
    {
        e.Cell.ToolTip = "Available";
    }
}

VisibleMonthChanged - Fires when the visible month is changed by the user
protected void Calendar1_VisibleMonthChanged(object sender, MonthChangedEventArgs e)
{
    Response.Write("Month changed from ");
    Response.Write(GetMonthName(e.PreviousDate.Month));
    Response.Write(" to ");
    Response.Write(GetMonthName(e.NewDate.Month));
}
private string GetMonthName(int MonthNumber)
{
    switch (MonthNumber)
    {
    case 1:
        return "Jan";
    case 2:
        return "Feb";
    case 3:
        return "Mar";
    case 4:
        return "Apr";
    case 5:
        return "May";
    case 6:
        return "Jun";
    case 7:
        return "Jul";
    case 8:
        return "Aug";
    case 9:
        return "Sep";
    case 10:
        return "Oct";
    case 11:
        return "Nov";
    case 12:
        return "Dec";
    default:
        return "Invalid Month";
    }
}


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