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Discussion on: Review. Event dispatcher based on the CustomEvent interface

shystruk profile image
Vasyl Stokolosa Author

You may have multiple listeners, but when you want to remove them you will remove only the last.

TARGET.removeEventListener(eventName, EVENTS[eventName]);

Good point here. Should think about that.

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theoutlander profile image
Nick Karnik

Don't just remove the last added. The user needs complete control.

Usually, this is how I would expect it to be used:

let listener = () => {...}
obj.addEventListener('event', listener)
obj.removeEventListener('event', listener)

Another variation is:

let listenerHandler = obj.addEventListener('event', () => {...})
obj.removeEventListener('event', listenerHandler)

Simply calling this should remove all listeners:

obj.removeEventListener('event')
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shystruk profile image
Vasyl Stokolosa Author

removeEventListener required a handler
developer.mozilla.org/en-US/docs/W...
so, you have to call remove for all listeners and pass the handler function