TCallbackOptions allows a common set of callback client-side options
to be attached to one or more active controls.
This can be useful if a lot of active controls on the same page are sharing the same callback client-side options.
Instead of specifying the same set of options again and again inside each control, these can be written once
inside a TCallbackOptions; this TCallbackOptions can be then attached to each control using the
ActiveControl.CallbackOptions property. For a full list of assignable properties, please check the
The typical scenario of use for a TCallbackOptions is a page where a lot of active controls needs to
pause the user interaction with a "Please wait" style message until callback completion.
First create a single TCallbackOptions control, assign it an ID and the the needed properties:
ClientSide.OnLoading="... kindly inform the user that he should wait ..."
ClientSide.OnComplete="... callback completed, ready to serve the user again ..."
Then, share this set of options to one or more active controls; each control will follow them: