Binding on .length of an object

[justinbmeyer]

If I have a compute like:

var obs = new can.Observe();
var compute = can.compute(function(){
  var txt = "';
  obs.each(function(val){
    txt+= val
  });
  return txt;
})

It should produce change events when I add or remove properties to obs.

[dispatchrabbi]

Here's what I think is happening here: compute keeps an eye out for when .attr() is called on an observable in its value function, but it's not recognizing when .each() is called (probably because .each() calls .attr() on different things each time). More later, hopefully after fixing.

[justinbmeyer]

This works now by using can.Observe.keys( observe ) -> [key1, key2].

When you call the keys function, it indicates that you are reading from a special __keys property. When you add or remove properties to the observe, a __keys event is triggered.

__keys is now a reserved property on can.Observes.