Created
October 10, 2023 14:34
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Intersection Observer - Sticky Class Conditionally Applied
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8" /> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0" /> | |
| <title>Document</title> | |
| <style> | |
| body { | |
| margin: 0px; | |
| font-family: Roboto, Tahoma; | |
| } | |
| #logo-container { | |
| background-color: #bdc3c7; | |
| height: 100px; | |
| text-align: center; | |
| padding-top: 20px; | |
| font-weight: bold; | |
| } | |
| #nav-container-top { | |
| background-color: #bdc3c7; | |
| min-height: 1px; | |
| min-width: 1px; | |
| } | |
| #nav-container { | |
| background-color: #2980b9; | |
| height: 60px; | |
| line-height: 60px; | |
| color: white; | |
| text-align: center; | |
| font-size: 18px; | |
| position: sticky; | |
| top: 120px; | |
| font-weight: 700; | |
| transition: font-size 0.2s ease-in; | |
| } | |
| #nav-container:after { | |
| content: " down 👇"; | |
| } | |
| .nav-container-sticky { | |
| background-color: #e74c3c !important; | |
| font-size: 18px !important; | |
| } | |
| #nav-container.nav-container-sticky:after { | |
| content: "up ☝"; | |
| } | |
| #main-container { | |
| background-color: #ecf0f1; | |
| height: 2000px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div | |
| id="logo-container" | |
| style="background-color: aqua; top: 0px; position: sticky; z-index: 10" | |
| > | |
| Background | |
| </div> | |
| <div id="logo-container">Background2</div> | |
| <div id="nav-container-top"></div> | |
| <div id="nav-container" style="z-index: 30"> | |
| This will get sticky scroll | |
| </div> | |
| <div id="main-container"></div> | |
| </body> | |
| <script> | |
| //var element = document.querySelector("#nav-container"); | |
| //Stickyfill.add(element); | |
| //to check when element get's position sticky | |
| var observer = new IntersectionObserver( | |
| function (entries) { | |
| // no intersection | |
| if (entries[0].intersectionRatio === 0) | |
| document | |
| .querySelector("#nav-container") | |
| .classList.add("nav-container-sticky"); | |
| // fully intersects | |
| else if (entries[0].intersectionRatio === 1) | |
| document | |
| .querySelector("#nav-container") | |
| .classList.remove("nav-container-sticky"); | |
| }, | |
| { | |
| threshold: [0, 1], | |
| } | |
| ); | |
| observer.observe(document.querySelector("#nav-container-top")); | |
| </script> | |
| </html> |
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