Unbind specific callbacks

If there are multiple callbacks bound to a given key, e.g.

Mousetrap.bind('a', callback1)
Mousetrap.bind('a', callback2)

then using unbind nukes both of them. it’d be great to be able to unbind just one callback, e.g.

Mousetrap.unbind('a', callback2)

This seems like pretty common functionality – you can see it in jquery’s off, and in the DOM’s removeEventListener, etc.

I’m happy to write the feature and submit a pull request if this is something other people want too!

[59naga]

I’ve used a Mousetrap new instance as a namespace.

var mousetrap1= new Mousetrap
mousetrap1.bind('a', callback1)

var mousetrap2= new Mousetrap
mousetrap2.bind('a', callback2)

mousetrap2.reset()// then available the mousetrap1

But, Mousetrap.trigger doesn’t notify to all instances. (Mousetrap.trigger is not a global)

Mousetrap.trigger('a') // no callbacks

+1 This feature seems still necessary also.

[ccampbell]

Mousetrap actually doesn’t even allow binding of multiple callbacks right now. The second ‘a’ will overwrite the first one. So even before calling unbind, callback1 will never be called.

I feel like having multiple callbacks tied to the same key would be strange. Can you think of a use case where you would want to do that?