Created
May 4, 2017 20:23
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JS Bin // source https://jsbin.com/xoxavuj
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width"> | |
| <title>JS Bin</title> | |
| <style id="jsbin-css"> | |
| .header-block { | |
| display: block; | |
| padding: 1em; | |
| text-align: center; | |
| background: #f2f2f2; | |
| } | |
| .menu { | |
| display: block; | |
| padding: 1em; | |
| text-align: center; | |
| background: #333; | |
| color: #fff; | |
| } | |
| .menu.scroll { | |
| background: #cc0000; | |
| position: fixed; | |
| top: 0; | |
| left: 0; | |
| box-sizing: border-box; | |
| width: 100%; | |
| } | |
| .tall-block { | |
| display: flex; | |
| justify-content: center; | |
| height: 2000px; | |
| padding: 1em; | |
| background: #fff; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div class="header-block">Header</div> | |
| <div id="main_menu" class="menu">a menu</div> | |
| <div class="tall-block">Some content.</div> | |
| <script id="jsbin-javascript"> | |
| (function() { | |
| "use strict"; | |
| var last_known_scroll_position = 0; | |
| var sticking = false; | |
| var stickyEl = document.getElementById('main_menu'); | |
| var elOffset = stickyEl.offsetTop; | |
| window.addEventListener('scroll', function(e) { | |
| last_known_scroll_position = window.scrollY; | |
| if (last_known_scroll_position > elOffset) { | |
| if (sticking === true) { | |
| return; | |
| } | |
| window.requestAnimationFrame(function() { | |
| stickyEl.classList.add('scroll'); | |
| }); | |
| sticking = true; | |
| console.log(sticking); | |
| } else { | |
| if (sticking === false) { | |
| return; | |
| } | |
| stickyEl.classList.remove('scroll'); | |
| sticking = false; | |
| console.log(sticking); | |
| } | |
| }); | |
| })(); | |
| </script> | |
| <script id="jsbin-source-css" type="text/css">.header-block { | |
| display: block; | |
| padding: 1em; | |
| text-align: center; | |
| background: #f2f2f2; | |
| } | |
| .menu { | |
| display: block; | |
| padding: 1em; | |
| text-align: center; | |
| background: #333; | |
| color: #fff; | |
| } | |
| .menu.scroll { | |
| background: #cc0000; | |
| position: fixed; | |
| top: 0; | |
| left: 0; | |
| box-sizing: border-box; | |
| width: 100%; | |
| } | |
| .tall-block { | |
| display: flex; | |
| justify-content: center; | |
| height: 2000px; | |
| padding: 1em; | |
| background: #fff; | |
| }</script> | |
| <script id="jsbin-source-javascript" type="text/javascript"> | |
| (function() { | |
| "use strict"; | |
| var last_known_scroll_position = 0; | |
| var sticking = false; | |
| var stickyEl = document.getElementById('main_menu'); | |
| var elOffset = stickyEl.offsetTop; | |
| window.addEventListener('scroll', function(e) { | |
| last_known_scroll_position = window.scrollY; | |
| if (last_known_scroll_position > elOffset) { | |
| if (sticking === true) { | |
| return; | |
| } | |
| window.requestAnimationFrame(function() { | |
| stickyEl.classList.add('scroll'); | |
| }); | |
| sticking = true; | |
| console.log(sticking); | |
| } else { | |
| if (sticking === false) { | |
| return; | |
| } | |
| stickyEl.classList.remove('scroll'); | |
| sticking = false; | |
| console.log(sticking); | |
| } | |
| }); | |
| })();</script></body> | |
| </html> |
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| .header-block { | |
| display: block; | |
| padding: 1em; | |
| text-align: center; | |
| background: #f2f2f2; | |
| } | |
| .menu { | |
| display: block; | |
| padding: 1em; | |
| text-align: center; | |
| background: #333; | |
| color: #fff; | |
| } | |
| .menu.scroll { | |
| background: #cc0000; | |
| position: fixed; | |
| top: 0; | |
| left: 0; | |
| box-sizing: border-box; | |
| width: 100%; | |
| } | |
| .tall-block { | |
| display: flex; | |
| justify-content: center; | |
| height: 2000px; | |
| padding: 1em; | |
| background: #fff; | |
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| (function() { | |
| "use strict"; | |
| var last_known_scroll_position = 0; | |
| var sticking = false; | |
| var stickyEl = document.getElementById('main_menu'); | |
| var elOffset = stickyEl.offsetTop; | |
| window.addEventListener('scroll', function(e) { | |
| last_known_scroll_position = window.scrollY; | |
| if (last_known_scroll_position > elOffset) { | |
| if (sticking === true) { | |
| return; | |
| } | |
| window.requestAnimationFrame(function() { | |
| stickyEl.classList.add('scroll'); | |
| }); | |
| sticking = true; | |
| console.log(sticking); | |
| } else { | |
| if (sticking === false) { | |
| return; | |
| } | |
| stickyEl.classList.remove('scroll'); | |
| sticking = false; | |
| console.log(sticking); | |
| } | |
| }); | |
| })(); |
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