added asyncFuncCall - Validates a field using an asynchronous third party function #783
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Validates a field using an asynchronous third party function call. This behaves similarly to funcCall, but the external function is an asynchronous function - it does not return anything. Instead it must call a callback with the validation result (true if success, false if failure) and an optional message to display. This allows you to validate anything asynchronously (i.e. call ajax, call some 3rd party library, use websockets, etc.)
The following declaration will do