React Samples

Scroll check (no observer)

  • use relative in parent to use offsetTop from parent element. see here. default 'static' is not included in offsetParent.
  • overflow-auto/scroll in parent
  • compare parent scrollTop and child offsetTop
scrollTop: 0 px
[offsetTop (px)]
0
0 px
1
0 px
2
0 px
3
0 px
4
0 px
5
0 px
6
0 px
7
0 px
8
0 px
9
0 px