Preventing an duplicate ajax events in jquery

What is a good way to block until a previous ajax event is completed? I followed https://stackoverflow.com/questions/719194/how-can-you-make-a-vote-up-down-button-like-in-stackoverflow but if I click the button fast enough, it'll send multiple (and maybe inconsistent) events to the server. How do I make it so it'll forcethe user to wait before another click can be registered? Edit: I also do not want it to block globally - just for that button/item. Do I'll need to maintain a hash?

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