ScrollPositionHour not working with DayPilotCalendar in AjaxControlToolkit.TabContainer

Oh, just to detail i've also tried the workaround i found on bug forums
dpc.$('scroll').scrollTop = valueInPixels;

setting dpc to calObject.ClientId but just got javascript error

The problem is caused by DayPilotCalendar being placed inside a hidden div (style="display:none"). It's not possible to set .style.scrollTop for elements that are inside such a hidden div.

Solution:

1. DayPilotCalendar is in the first tab
Just set ActiveTabIndex property of <ajaxToolkit:TabContainer> tag to "-1".

2. DayPilotCalendar is in another tab or there are more instances of DayPilotCalendar (in more than one tab)
You need to call the scrollbar position update function from the OnClientActiveTabChanged event:

<script type="text/javascript">
function updateScrollPos() {
dpc1.enableScrolling();
// dpc1 is the value of ClientObjectName property of DayPilotCalendar
// remember to call it for all DayPilotCalendar instances
}
</script>

<ajaxToolkit:TabContainer ID="TabContainer1" runat="server" ActiveTabIndex="-1" OnClientActiveTabChanged="updateScrollPos" >
...

Thanks a lot, both your tips worked wonderfully.
Meanwhile sadly i found a minor bug (or at least it seems so to me).
If the value of the DataTextField contains the ' character (like in O'Connell) the event box gets all blacked out.

This is a minor problem still... in italian language is a commonly used character.
Thanks in advance for any help you can bring, you already saved my day.

Cheers,
Fabrizio

Any idea how to fix this within a ModalPopupExtender?

What you need to do is to invoke dpc1.enableScrolling(); after the modal Panel is made visible.

1. I'm not sure whether it's possible to hook the show event of the ModalPopupExtender on the client side (that would be the right place to put it).
2. You could also try to invoke it manually and add the enableScrolling() call right after the show() call:

$find('mdlPopupExtender').show();
dpc1.enableScrolling();

Thanks for the response. I have found some places to do add the enableScrolling call which works, but not fully satisfied yet. Will try more places though.

Stupid ModalPopupExtender not having client side onshown event... ;)

Found a neat way to handle this when the calendar is inside a ModalPopupExtender:

<script type="text/javascript">
function pageLoad()
{
var mpe = $find("mpe");
mpe.add_shown(onShown);
}

function onShown()
{
dpc1.enableScrolling();
}
</script>

<ajaxtoolkit:modalpopupextender ........ behaviorId="mpe" ..... /

Thanks for posting the solution!