Scheduler never returns from Callback when after third event is selected.

This usually means there is a JavaScript error that prevents the callback from completing.

1. You should be able to the details of the error it in the JavaScript console.

2. Sometimes, the client-side error is caused by a server-side error that results in an incorrect response (HTML with the error message instead of JSON message). You should be able to check that by checking the last response in the Network tab of Chrome developer tools.

If you post the error details here I can help with finding the cause (it might be a DayPilot bug or a bug in your code).

Hi,

IE console showed no error, but FFs did. There is indeed a javascript error:
"SyntaxError: JSON.Parse: unexpected character at line 1 column 1 of the JSON data"

In the network tab the last response says (after a long non-readable string)
"System.InvalidCastException: Das Objekt des Typs "System.Object" kann nicht in Typ "System.String" umgewandelt werden.
bei DayPilot.Web.Ui.Events.TagCollection.ToJson()
bei DayPilot.Web.Ui.Events.Common.EventInfo.ToJson()
bei DayPilot.Web.Ui.DayPilotScheduler.GetSelectedEvents()
bei DayPilot.Web.Ui.DayPilotScheduler.System.Web.UI.ICallbackEventHandler.GetCallbackResult()"

Above error is in german and roughly says "Object of type 'System.Object' can not be converted to type 'System.String'"

I don't know how I can look into that JSON data that is causing the error.

Thanks for the quick reply!

Kind regards
Chris

Aside from that: Can't I change the events background without a callback just on the client?
As of now all events are colored inside BeforeEventRender, but it that seems not really necessary if the
user just selects an event to make a callback.

> "System.InvalidCastException: Das Objekt des Typs "System.Object" kann nicht in Typ "System.String" umgewandelt werden.

This looks like a serialization problem. It happens when one of the tag values is null.

It should be fixed now in the latest sandbox build (8.1.3483):

http://www.daypilot.org/sandbox/

> Can't I change the events background without a callback just on the client?

Yes, you can. You need the DayPilot.Event object (which is usually accessible in the JavaScript event handler; you can also get it using dp.events.find() on the client side)

  e.data.backColor = "red";   // e -> DayPilot.Event object
  dp.events.update(e);      // dp -> DayPilot.Scheduler object (set using ClientObjectName attribute in ASP.NET)

Thanks a lot for the support!

I will test the sandbox build later and let you know if the problem is gone.

I guess selecting an event (so it's server-side in the Scheduler.SelectedEvents list) at the client scheduler object is not possible?

You can select it on the client side using .multiselect.add():

http://api.daypilot.org/daypilot-scheduler-multiselect-add/