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I'm using Truffle (Webpack Box) and watching events on the front end. I'm having to design around ensuring I do not initiate watching for events more than once. Is there a best practice on how to do this? Is there a quick way to tell if an event is already being watched?

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When you start watching the events with 

filter = myInstance.EVENT(filter, additionalFilter, callback)

you can store the returned filter. If you have the filter and your callback didn't run into an error, you can assume that you're watching, otherwise the watching has stopped.

If you want to explicitly stop watching the events, call filter.stopWatching().

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  • Thanks, that approach makes sense. Do you know of any issues with testrpc duplicating events? I'm using this approach, and I can tell that I'm not duplicating the event watch, but I'm seeing multiple events of the same pop up.
    – Karen S
    Mar 26, 2018 at 23:19
  • Can you observe the same behaviour with duplicates when you run your code with geth/parity? I am working with ganache-cli 6.1.0 (successor to testrpc) right now and I didn't observe any issues watching events.
    – ivicaa
    Mar 27, 2018 at 5:15

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