Is it possible to modify the appearance of my top navigation bar once the page has been scrolled a specific number of pixels? I assume this requires some sort of listener to track the amount of scrolling. I came across element.scrollTop, but it doesn't seem to actively monitor the user's scroll progress.
What approach should I take to implement this feature?
Give this a shot:
window.addEvent('scroll',function(e) {
if (document.body.scrollTop > 50 || document.documentElement.scrollTop > 50) {
// Add your code here
}
});
Implement the following code snippet.
$(window).scroll(function()
{
document.getElementById("fixed_box").innerHTML = "You have scrolled to " + $(window).scrollTop() + "px";
});#fixed_box {
position: fixed;
top: 10px;
overflow: auto;
height: 100%;
}<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<div style="height: 5000px;">
</div>
<div id="fixed_box">You have scrolled to 0px</div>window.addEventListener('scroll',handleScroll);
function handleScroll(){
let scrollPosition = window.pageYOffset || window.scrollY || document.body.scrollTop || document.documentElement.scrollTop;
if(scrollPosition >50)
console.log('Viewport scrolled more than 50px')
else
console.log('Viewport scrolled less than 50px')
}
let optimizedHandlerScroll = debounce(handleScroll, 200);
window.addEventListener('scroll',optimizedHandlerScroll);
function handleScroll(){
let scrollPosition = window.pageYOffset || window.scrollY || document.body.scrollTop || document.documentElement.scrollTop;
if(scrollPosition >=50){
console.log('more than 50')
}
else
console.log('less than 50')
}
function debounce(fn, delay) {
let timer = null;
return function () {
clearTimeout(timer);
timer = setTimeout(function () {
fn();
}, delay);
};
}The initial basic version is functional, but it can be resource-intensive. The scroll event handler gets triggered multiple times. On the other hand, the improved version in the gist only executes the handler once you finish scrolling, making it more efficient.
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