How can I use JavaScript to determine if the page is at scroll(0,0)?
I have a full-page slider that needs to pause when the page is no longer at the top.
The page may not be scrolled manually, as there are internal HTML # links that could load the page directly to a scrolled point without scrolling.
The check needs to determine if the page is not at the top, rather than whether it has been scrolled.
To determine if the window has scrolled vertically to its top position, you can check the value of window.scrollY (the number of pixels scrolled vertically) against 0. If you need to ascertain whether the window has been scrolled to the leftmost position, you can compare window.scrollX (the number of pixels scrolled horizontally) with 0. By combining these conditions, you ensure that the window is at the position (0,0).
if(window.scrollY==0){
//user has scrolled to the top of the page
}
if(window.scrollX==0){
//user has scrolled to the leftmost part of the page
}
if(window.scrollY==0&&window.scrollX==0){
//user has scrolled to the leftmost part of the top of the page—reaching position (0, 0)
}
Check out the demo:
var goToTop = document.querySelector('#backToTop');
goToTop.addEventListener("click", function(e){
window.scroll({top: 0, left: 0, behavior: 'smooth'});
//scroll smoothly back to the top of the page
});
window.addEventListener("scroll", function(){
if(window.scrollY==0){
//user is at the top of the page; no need to show the back to top button
goToTop.style.display = "";
} else {
goToTop.style.display = "block";
}
});body,html{height:3000px;position:relative;margin:0}#footer{position:absolute;width:100%;bottom:0;left:0;right:0;background-color:#1e90ff;text-align:center}#backToTop{position:fixed;right:0;bottom:0;display:none;z-index:1}#header{position:absolute;width:100%;top:0;left:0;right:0;background-color:#1e90ff;text-align:center}<div id="header">Header</div>
<button id="backToTop">Back To Top</button>
<div id="footer">Footer</div>For improved browser compatibility, utilize window.pageYOffset in place of window.scrollY, and window.pageXOffset as a replacement for window.scrollX.
The following code snippet is useful for scenarios where full browser compatibility is essential (e.g., IE < 9):
var x = (window.pageXOffset !== undefined)
? window.pageXOffset
: (document.documentElement || document.body.parentNode || document.body).scrollLeft;
//number of pixels scrolled horizontally (use this value instead of window.scrollX or window.pageXOffset)
var y = (window.pageYOffset !== undefined)
? window.pageYOffset
: (document.documentElement || document.body.parentNode || document.body).scrollTop;
//number of pixels scrolled vertically (work with this value instead of window.scrollY or window.pageYOffset)
Give this a shot:
document.documentElement.scrollTop === 0
Latest Update for 2019
In the current state, document.body.scrollTop is now considered obsolete and completely ineffective in Chrome. To address this issue, it is recommended to explore all available options to ensure a compatible solution across different browsers.
!window.pageYOffset
By testing these three alternatives, you can achieve functionality on all browser platforms. When the value is zero, you have reached the top of the viewport.
In my opinion, one way to retrieve the position is by utilizing jQuery's $(window).scrollTop() method.
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