在不滚动的情况下将新的Ajax内容加载到当前div之上

I'm not sure if I'm allowed to post questions without code here. Anyway, if it's too broad or not appropriate I'll gladly delete. I'm currently in the process of implementing pull to refresh, and never ending scroll, both of which are so popular now obviously because of their usability. I'm not sure if I'm allowed to post questions w