RadCalendar selection problem(urgent!)

[Ahmet Ozkan]

Hi everybody,
    Firstly I used version of Telerik Q1 and I have trouble with radcalendar, problem is this:

    I provide dates for the calendar when page is loading, and calendar's allow multiple date selection. After page load I see the selected dates well. I want to achive that, when I click a date, post clicked date to another page via request. However when I clicked one of formerly selected date this date is disselect, and it gives me the previous selected date, for example when i click
"november 3" it gives me nothing than i clicked "4 november" it gives me "3 november" and that's going like that. My question is that actually; How can I prevent disselection when i clicked a formerly selected date?

[Dimo]

Hi Ahmet,

You can prevent deselection by using the OnDateSelecting client event:

http://www.telerik.com/help/aspnet-ajax/calendar_clientsideondateselecting.html

<telerik:RadCalendar ID="RadCalendar1" runat="server" EnableMultiSelect="true">
    <ClientEvents OnDateSelecting="MyDateSelecting" />
</telerik:RadCalendar>

<script type="text/javascript">

function MyDateSelecting(sender, args)
{
    if (!args.get_isSelecting())
        args.set_cancel(true);
}

</script>



Best wishes,
Dimo
the Telerik team

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[Tim]

How do we do this for the Silverlight RadCalendar

[Vladi]

Hi,

In order to achieve the desired behavior in Silverlight you could use the SelectionChanged event of the RadCalendar control and in that event use the SelectionChangedEventArgs to get the RemovedItems collection and add it to the SelectedDates of the control.

Th next code snippet represents the described approach:
in the xaml:

<telerik:RadCalendar SelectionChanged="RadCalendar_SelectionChanged_1"
            SelectionMode="Multiple"/>

and in the code behind:

private void RadCalendar_SelectionChanged_1(object sender, Telerik.Windows.Controls.SelectionChangedEventArgs e)
{
    var calendar = sender as RadCalendar;
    var removedItems = e.RemovedItems as IList<object>;

    Dispatcher.BeginInvoke(() =>
    {
        foreach (var item in removedItems)
        {
            if (!calendar.SelectedDates.Contains((DateTime)item))
            {
                calendar.SelectedDates.Add((DateTime)item);
            }
        }
    });
}

You should note that the Dispatcher is required as the selection needs to be slowed in order for the adding functionality to work. Hope this is helpful.

I would kindly ask you if you have any other or future Silverlight questions to post them in the Silverlight forum section.

Greetings,
Vladi
the Telerik team