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Detect when an Element Gets Fixed in CSS position:sticky using Intersection Observer
By applying various CSS styles to the element with the sticky position, we can easily detect it.
The following example shows this property.
Example
<!DOCTYPE html> <html> <head> <style> #first { background-color: lightgrey; height: 10px; } #navbar-top { background-color: lightgrey; height: 2px; } #container { position: sticky; top: 0; box-shadow: inset 0 0 25px navy; height: 55px; text-align: center; font-size: 24x; line-height: 55px; font-weight: bold; transition: font-size 0.4s ease-in; } .sticky-navbar { box-shadow: inset 0 0 15px orange!important; font-size: 20px !important; } #parent-container { background-color: aliceblue; height: 3300px; } </style> </head> <body> <div id="first"></div> <div id="navbar-top"></div> <div id="container">Watch Me!</div> <div id="parent-container"></div> <script> let newObserver = new IntersectionObserver(function(entries) { if(entries[0].intersectionRatio === 0) document.querySelector("#container").classList.add("sticky-navbar"); else if(entries[0].intersectionRatio === 1) document.querySelector("#container").classList.remove("sticky-navbar"); }, { threshold: [0,1] }); newObserver.observe(document.querySelector("#navbar-top")); </script> </body> </html>
Output
This will produce the following result −
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