How to load script only after scroll

Question

I want to load script only after user scroll down to certain position. I tried this jquery method but it is not working. Any idea?

 $( window ).scrollTop(800);
  $.ajax({
  url: 'https://externalscript.comt/my.js',
  dataType: 'script',
  cache: true,
   });
 });

Answer 1

replace alert with the script you want

Answer 2

let flag = false; document.onscroll = () => { if (scrollY > 300 && flag == false) {flag = true; alert("reached")}}

https://code.sololearn.com/We0x0YDN9C9N/?ref=app

Answer 3

Gordon but how to call javascript