I recently tried to update our web application from DP 8.1 to DP 8.1 SP5.
However after that update I noticed that a asp:CheckboxList inside an UpdatePanel (next to DaypilotScheduler) was not working correctly anymore. The CheckboxList controls resources for the scheduler.
I changed back to DP 8.1 and the CheckboxList worked properly again.
I tried all the service packs of 8.1 and starting from SP1 the checkbox list won't work.
I added another dummy checkbox list that has no interaction with the scheduler and it's not working.
The wrong behavior is as follows:
I can check unchecked boxes (EventHandler for SelectedIndexChanged is called)
I cannot uncheck checked boxes (EventHandler for SelectedIndexChanged is NOT called, when Page_Load is called the ListItems have already a wrong "Selected" property)
The above is true for every box except the last one, no matter how many boxes are in the list.
Firefox console does not show any errors. I tested with IE11 and Firefox 44.0.2
CheckboxList looks like this (items are added in code behind)
<asp:CheckBoxList ID="cblTPMDFE" runat="server" AutoPostBack="True" Font-Italic="True" RepeatDirection="Horizontal"/>
Any idea why this could be happening?
I know, this does not really sound like a proplem of DP but that is the only thing I changed.
I saw that in SP1 a client init was introduced, maybe it got something to do with that?
Thanks in advance and kind regards