Firebase lazy load
问题 I'm trying to lazy load firebase items to later on load more of them whenever user reaches end of div container. When i remove .endAt() and .startAt() i'm receiving the 15 items though they are not beeing incremented and it's stuck at these 15 items. When i keep .endAt() and .startAt() i'm receiving firebase warning Using an unspecified index. Consider adding ".indexOn": "title" at /items even though .indexOn is set. I'm confused by that warning. Thanks in advance for any help. Firebase