Overriding Calendar.CreateChildControls

17 Mar 2006 8:38 PM

krassimir

Hi All,

I am trying to subclass the Calendar Web Control to achieve the following. I
need to split each Calendar Cell in two parts - AM & PM parts. AM & PM parts
are populated by a List<TimeEntryDetail> custom collection. An user can click
in eather to adjust the entered information. I want to trach the Click &
DoubleClick events on the server.

I have tried hooking into the DayRender event, clearing the e.Cell.Controls
collection and adding two new custom controls TimeDetailDay which define
Click & DoubleClick events and know how to render the AM & PM part
respectively. That gave me the desired calendar look but the events did not
fire.

I gues I need to derive a custom control from Calendar and override the
CretaeChildControls method. The thing is there is no way to get a hold of the
internal Table control that's used to hold the calendar cells.

Any advise on how to approach this is very appreciated. Or do I just need to
write a custom calendar control from scratch in order to do this?

Krassimir

19 Mar 2006 9:10 PM

Phillip Williams

Hello Krassimir,

The DayRender event is triggered later than the page initialization stage
and therefore any dynamically added controls will not retain their ViewState
upon postback.

â€œBecause the DayRender event is raised while the Calendar control is being
rendered, you cannot add a control that can also raise an event, such as
LinkButton. You can only add static controls, such as
System.Web.UI.LiteralControl, Label, Image, and HyperLink.â€ http://msdn2.microsoft.com/en-us/library/system.web.ui.webcontrols.calendar.dayrender(VS.80).aspx

However, using the advice of Microsoft, as quoted above, you can use static
controls in combination with some JavaScript to generate a postback event
from another server control on the web form to achieve the same effect.

Here is one demonstration of such a programming strategy for this task:
http://www.webswapp.com/codesamples/aspnet20/calendar/default.aspx

--
HTH,
Phillip Williams
http://www.societopia.net
http://www.webswapp.com

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"krassimir" wrote:

> Hi All,
>
> I am trying to subclass the Calendar Web Control to achieve the following. I
> need to split each Calendar Cell in two parts - AM & PM parts. AM & PM parts
> are populated by a List<TimeEntryDetail> custom collection. An user can click
> in eather to adjust the entered information. I want to trach the Click &
> DoubleClick events on the server.
>
> I have tried hooking into the DayRender event, clearing the e.Cell.Controls
> collection and adding two new custom controls TimeDetailDay which define
> Click & DoubleClick events and know how to render the AM & PM part
> respectively. That gave me the desired calendar look but the events did not
> fire.
>
> I gues I need to derive a custom control from Calendar and override the
> CretaeChildControls method. The thing is there is no way to get a hold of the
> internal Table control that's used to hold the calendar cells.
>
> Any advise on how to approach this is very appreciated. Or do I just need to
> write a custom calendar control from scratch in order to do this?
>
> Krassimir