JS calling IW Async event

[RenSword]

Is there a way where a JS can call an Async event in IW?

You mean button async click this kind of async event? if yes
you can try to use

Code:

ajaxCall("btnAdd.DoOnAsyncClick");
ajaxCall("btnAdd.DoOnAsyncClick", "key=12"); //To pass params to the event, it can be access with EventParams(TStringList)
ajaxCall("btnAdd.DoOnAsyncClick", null, true); //third params is to activate async lock (default is undefined > false)

in your JS