Lightweigh data observer, no need to load heavy libraries. Just store your data and add some triggers when this data change. If you want to see it working, here is a dummy demo

You set or observe data using a same data-id, that's the way the triggers are linked to the data

The data-id is an unique string/interger that will be use to observe any change in the future of the data stored in the dataObs, the data could be any type of Object

dataObs.set('data-id' ,data);

To observe the changes of a data-id you need to create a function that will recieve one parameter, that function is the trigger that is executed every time the data change. When a trigger is set to observer is going to be executed in the case when some data already stored with the same data-id.

dataObs.observe('data-id' ,function(data){
    // do your stuff here ;)
});

Also you can check the value that a data-id have assigned

dataObs.get('data-id');

MIT