@tfutada Glad I could be of help. If your data is around 300 elements then maybe you don’t even need ons-lazy-repeat, maybe a simple ng-repeat could be sufficient, but I guess if you want to use lazy-repeat that’s also fine. It may still yield better performance even though the difference may not be very big.
@anderson ons-keyboard-inactive was for Onsen 1. There is not an equivalent that I am aware of. I would suspect you approach the use case differently in Onsen 2. What exactly are you trying to do? Are you wanting to hide a key on the keyboard?