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July 15, 2017 21:03
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logging the scrolled position with window.requestAnimationFrame
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title></title> | |
| <style> | |
| html { | |
| height: 2000px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| lol | |
| </body> | |
| <script> | |
| var last_known_scroll_position = 0; | |
| var ticking = false; | |
| function doSomething(scroll_pos) { | |
| console.log( | |
| last_known_scroll_position | |
| ) | |
| } | |
| window.addEventListener('scroll', function(e) { | |
| last_known_scroll_position = window.scrollY; | |
| if (!ticking) { | |
| window.requestAnimationFrame(function() { | |
| doSomething(last_known_scroll_position); | |
| ticking = false; | |
| }); | |
| } | |
| ticking = true; | |
| }); | |
| </script> | |
| </html> |
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