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Getting selected date in the RadCalendar SelectionChanging event

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Calendar, DateTimePicker, TimePicker and Clock

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9 Answers, 1 is accepted

answered on 19 Feb 2011, 11:42 PM

Richard

Thanks for the reply, I originally used SpecialDays but because of the complexity of the highlighting it was much quicker and simpler to use the ElementRender event (I display 6 months worth of calendar and potentially hundreds of days of highlighting and multiple highlights per day)

The issue is not how to render the days but why the SelectionChanging changing event does not return the date that has caused the event to fire, rather it returns the date that is already selected. This would seem to make the event completely useless as there is no mechanism for determining whether the date about to be selected is valid or useful which is the main reason for a SelectionChanging event.

I just happen to be using it to select from the database information based on the upcoming selection but it could be just as likely that I might want to stop a user from selecting that date based on other logic and cancel the changing event. This would seem to me to be an error in the design of the SelectionChanging event.

I have got around the problem in what I consider a not very elegant but workable way, by determining the cell that was clicked and getting the date from that, see below

DateTime selDate = this.RadCalendar1.FocusedDate;

Point mouseLoc = this.RadCalendar1.PointToClient(Cursor.Position);

Telerik.WinControls.RadElement selElement = this.RadCalendar1.ElementTree.GetElementAtPoint(mouseLoc);

if (selElement != null && (CalendarCellElement)selElement is CalendarCellElement)

{

CalendarCellElement selCell = (CalendarCellElement)selElement;

selDate = selCell.Date;

}

This is now working OK.

Thanks

Peter

answered on 23 Feb 2011, 02:26 PM

Hi All,

because I have also problems/issues with the RadCalender in the SelectionChanging event, I did not open a new thread.

Some of the calendar settings: allowed multiple select and multi view, the RangeMinDate is 1900.01.02 (to check that this is not equal to 1900.01.01 later), the FocusedDate and SelectedDate are 2010.10.01 (the actual month of our test system).

1. When I click first time to the 2010.10.02 cell, the e.Dates contains 5 elements (two times the today, three times the original RangeMinDate)
+      [0]   {2011.02.23. 0:00:00}   System.DateTime
+      [1]   {2011.02.23. 0:00:00}   System.DateTime
+      [2]   {1900.01.01. 0:00:00}   System.DateTime
+      [3]   {1900.01.01. 0:00:00}   System.DateTime
+      [4]   {1900.01.01. 0:00:00}   System.DateTime

after the second click it contains 6 elements (the last item is the date of the clicked cell)
+      [0]   {2011.02.23. 0:00:00}   System.DateTime
+      [1]   {2011.02.23. 0:00:00}   System.DateTime
+      [2]   {1900.01.01. 0:00:00}   System.DateTime
+      [3]   {1900.01.01. 0:00:00}   System.DateTime
+      [4]   {1900.01.01. 0:00:00}   System.DateTime
+      [5]   {2010.10.02. 0:00:00}   System.DateTime

After the click on the Clear button it clears the e.Dates, and the e.Dates contains the perfect dates: 1 element or empty after the new clicks.

2. If I turn off the multiple select, I see the behaviors of the first post:
Clicks on the 2010.10.02 cell:
1st click: e.Dates = today
2nd click: e.Dates = 2010.10.02
3rd click: e.Dates is empty
and the e.Dates contains the perfect values of the next clicks, 1 element or empty.

Best regards,

Peter Szintai