FlowIT-JIT
commented
2 years ago Actually event handlers do not receive null - but they might receive a control instance which has been destroyed, in which case it won't work. We can check whether a control has been disposed like this: var disposed = sender.GetDomElement() === null
Control events such as OnChange and OnBlur might receive null instead of a reference to the given control, if the control is disposed from another OnChange or OnBlur event handler.
Either the typescript definition should be updated to reflect this, disposing controls during event execution should be handled differently (e.g. postponed until all event handlers have been executed or by passing the control even though it has been disposed), or event execution should simply be stopped.