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Unexpected behaviour using AutoPostBack

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Calendar

This is a migrated thread and some comments may be shown as answers.

iTools asked on 28 Jul 2009, 03:43 AM

I want to have a calendar where a date selection causes a user to be redirected to an appropriate page. So, I set AutoPostBack="true" for the RadCalendar control and handle the SelectionChanged event on the server-side. Although, if user navigates from the page back to the calendar and hover the mouse over the previously selected date it appears selected.

How to replicate...

Markup:

    
            <html xmlns="http://www.w3.org/1999/xhtml"> 
        
            <head runat="server"> 
        
                <title>Untitled Page</title> 
        
                <meta http-equiv="expires" content="-1" /> 
        
                <meta http-equiv="Pragma" content="no-cache" /> 
        
            </head> 
        
            <body> 
        
                <form runat="server"> 
        
                <asp:ScriptManager runat="server" /> 
        
                <telerik:RadCalendar ID="RadCalendar1" runat="server" AutoPostBack="true" /> 
        
                </form> 
        
            </body> 
        
            </html>

Codebehind:

    
                Private Sub RadCalendar1_SelectionChanged(ByVal sender As Object, ByVal e As Telerik.Web.UI.Calendar.SelectedDatesEventArgs) Handles RadCalendar1.SelectionChanged 
        
                    Dim d As String = e.SelectedDates(0).Date.ToShortDateString() 
        
                    RadCalendar1.SelectedDates.Clear() 
        
                    Response.Redirect("WebForm1.aspx?date=" + d) 
        
                End Sub

When the user presses the browser back button I want the calendar to be "fresh" and not have the hidden selection.

Thanks.

3 Answers, 1 is accepted

answered on 28 Jul 2009, 07:55 AM

Hi Jan,

Try attaching OnLoad client event to RadCalendar to deselect the dates when clicking the back button in browser. Give a try with this and see whether it helps.

VB:

    
            Protected Sub RadCalendar1_SelectionChanged(ByVal sender As Object, ByVal e As Telerik.Web.UI.Calendar.SelectedDatesEventArgs) 
        
                If e.SelectedDates.Count <> 0 Then 
        
                    Dim d As String = e.SelectedDates(0).[Date].ToShortDateString() 
        
                    Response.Redirect("WebForm1.aspx?date=" & d) 
        
                End If 
        
            End Sub

JavaScript:

    
            <script type="text/javascript"> 
        
            function OnLoad(sender, args) 
        
            { 
        
                var dates = sender.get_selectedDates(); 
        
                if(sender.get_selectedDates().length != 0) 
        
                { 
        
                    sender.unselectDates(dates); 
        
                } 
        
            } 
        
            </script>

Shinu

answered on 31 Jul 2009, 12:40 PM

Hello Jan,

You can just add a check to the SelectionChanged event handler to verify that the SelectedDates collection has any members like this:

    
            Protected Sub RadCalendar1_SelectionChanged(ByVal sender As Object, ByVal e As Telerik.Web.UI.Calendar.SelectedDatesEventArgs) 
        
                 If e.SelectedDates.Count > 0 Then 
        
                     Dim d As String = e.SelectedDates(0).Date.ToShortDateString() 
        
                     RadCalendar1.SelectedDates.Clear() 
        
                     Response.Redirect("WebForm1.aspx?date=" + d) 
        
                 End If 
        
            End Sub

Best regards,
Martin
the Telerik team

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