How to detect when page is scrolled to original top content

[codetrekk]

I created a fab button that fades in when scrolled downwards. Now I want it to fade out when I scroll to the originally loaded page.

Problem is: how do I detect when I scroll to my original page content? Because when I can detect that I can then make my button fade out.

[robinyo]

See:

• https://angularfirebase.com/snippets/animate-a-component-based-on-scroll-position-angular-4-2/
• https://github.com/Nolanus/ngx-page-scroll
• https://github.com/jmandreslopez/ng2-track-scroll