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Here are a few title options, focusing on the \'how-to\' aspect of your article:
* How to Detect Scroll Direction in JavaScript Without jQuery
* JavaScript Scroll Direction Detection: A Sim
Here are a few title options, focusing on the \'how-to\' aspect of your article: * How to Detect Scroll Direction in JavaScript Without jQuery * JavaScript Scroll Direction Detection: A Sim
Oct 27, 2024 am 09:10 AM
Detecting Scroll Direction without jQuery
When using JavaScript to execute a function on scroll, it can be beneficial to know the direction of the scroll. Without jQuery, this can be achieved by implementing a solution that stores and compares previous scrollTop values.
Solution
The following JavaScript code effectively detects scroll direction:
<code class="javascript">var lastScrollTop = 0;
// Customize this to target the desired element for scroll detection.
document.addEventListener("scroll", function() {
var st = window.pageYOffset || document.documentElement.scrollTop;
if (st > lastScrollTop) {
// Code to execute when scrolling down
} else if (st < lastScrollTop) {
// Code to execute when scrolling up
}
// Reset the lastScrollTop value to prevent false negatives on mobile devices.
lastScrollTop = st <= 0 ? 0 : st;
}, false);</code>
This solution provides a way to detect scroll direction without the use of jQuery. By storing and comparing scrollTop values, it effectively identifies both downscrolling and upscrolling actions.
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