find which event is triggred in backbone js event callback function

Question

obj.on('evt_A evt_B evt_c', function(eventData){
console.log("Is it possible here to find which event is triggered. As this callback is registered for three events. This callback is like a central callback for all the events on this object.")
})

obj.trigger('evt_A evt_B evt_c', [{eventDataForevt_A}, {eventDataForevt_B, {eventDataForevt_C}}])

There is one way of doing it, which is having a property in eventDataForevt_<A||B||C> which says the name of the event. But is it possible to do this without modifying the eventDataForevt_<A||B||C> ?

What do you get when you `console.log(eventData)`? Any reference to the name of the calling event? — David John Smith, Jan 20 '13 at 04:03
Do you have a concrete example I can work through here? I'm struggling to imagine how your events are actually firing. Are evt_A..C attributes of `obj` that you're watching for changes? — David John Smith, Jan 20 '13 at 04:23
`'evt_A evt_B evt_c' are not attributes of the `obj`, but they are custom event names on `obj`. — Rajkamal Subramanian, Jan 20 '13 at 04:45
possible duplicate of [How To Find Triggered Event From Backbone.listenTo?](http://stackoverflow.com/questions/14248801/how-to-find-triggered-event-from-backbone-listento) — mu is too short, Jan 20 '13 at 04:47

score 0 · Accepted Answer · answered Jan 20 '13 at 04:51

Check out this fiddle: http://jsbin.com/ucevov/4/edit

It doesn't seem possible to detect the event name from your obj.on - note that evt_c in this._events is true even when evt_c is not called.

However there is a special "all" event which passes in the name of the calling event as the first parameter, so

obj.on("all", function(eventName, eventData) {
  console.log(eventName);
});

should output the name of the event that was called.

find which event is triggred in backbone js event callback function

1 Answers1