Allows to bind "reach top" callback.

[evgd]

Could be considered as pre requirements for #146
DOESN'T:

1. autoscroll bottom on load
2. preserve scroll position after prepending new items.

[williamboman]

+1

[boushley]

Do you have an example of this functional anywhere that is publicly accessible?

[williamboman]

@boushley Facebook chat.

edit: Maybe I misunderstood you, you might've meant this specific PR?

[boushley]

Facebook chat is using react js isn't it? I'm not asking for an example of the concept in action. I'm asking for an example of this pull request being used, or a demo of this code.

The scroll top stuff appears to only work when infinite-scroll-container is set, otherwise you get a NaN so I'm trying to see what the setup for this looks like.

[boushley]

If you add containerTopOffset = container.scrollTop(); then this works against the window container as well.

[evgd]

Check this http://jsbin.com/xemeletuwi/1/edit?html,js,console,output but this is quite buggy. When I tested it I found out that there is no way to get height before and after prepend items without timeout because my example uses ng-repeat. The solution relies on digest cycle which is slow and you could see that even if you set timeout to small value it shows UI in previous state.
Maybe someone could help with this examples to make them more usable.
Btw I found https://github.com/angular-ui/ui-utils/blob/master/modules/scroll/README.md scroll component of ui-utils which implements custom repeater and supports two directions scroll with virtual scroll.

[evgd]

http://jsbin.com/qoqahijene/3/edit
this one works with ng-repeat $first/$last hack but timeout value should be big enough to get new scroll height. Couldn't figure out way to get notified when ngRepeat finished and DOM updated.