I need to detect if a user is scrolled to the bottom of a page. If they are at the bottom of the page, when I add new content to the bottom, I will automatically scroll them to the new bottom. If they are not at the bottom, they are reading previous content higher on the page, so I don't want to auto-scroll them since they want to stay where they are.
How can I detect if a user is scrolled to the bottom of the page or if they have scrolled higher on the page?
window.onscroll = function(ev) {
if ((window.innerHeight + Math.round(window.scrollY)) >= document.body.offsetHeight) {
// you're at the bottom of the page
}
};
document.documentElement.scrollTop instead of window.scrollY for IE. Not sure which, if any, versions of IE support window.scrollY. –
Avalanche document.documentElement.scrollTop doesn't work with Safari, but window.scrollY does. –
Lafave (window.innerHeight + window.scrollY) >= document.documentElement.scrollHeight –
Dyne window.onscroll = function(ev) {
if ((window.innerHeight + window.pageYOffset) >= document.body.offsetHeight) {
alert("you're at the bottom of the page");
}
};
The problem with the current accepted answer is that window.scrollY is not available in IE.
Here is a quote from mdn regarding scrollY:
For cross-browser compatibility, use window.pageYOffset instead of window.scrollY.
And a working snippet:
window.onscroll = function(ev) {
if ((window.innerHeight + window.pageYOffset ) >= document.body.offsetHeight) {
alert("you're at the bottom of the page");
}
};<br>
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<br>Based on @Raphaël's comment, there was a problem in mac due to a small offset.
The following updated condition works:
(window.innerHeight + window.pageYOffset) >= document.body.offsetHeight - 2
I didn't have the chance to test it further, if someone can comment about this specific issue it will be great.
(window.innerHeight + window.pageYOffset) >= document.body.offsetHeight - 2 –
Overweigh (window.innerHeight + Math.ceil(window.pageYOffset + 1)) >= document.body.offsetHeight. –
Overweigh Math.ceil(window.innerHeight + window.pageYOffset) >= document.body.offsetHeight –
Teal window.pageYOffset === window.scrollY; // always true –
Ortego The accepted answer did not work for me. This did:
window.onscroll = function(ev) {
if ((window.innerHeight + window.scrollY) >= document.body.scrollHeight) {
// you're at the bottom of the page
console.log("Bottom of page");
}
};
If you're looking to support older browsers (IE9) use the alias window.pageYOffset which has slightly better support.
I was searching for an answer but haven't found an exact one. Here is a pure javascript solution that works with latest Firefox, IE and Chrome at the time of this answer:
// document.body.scrollTop alone should do the job but that actually works only in case of Chrome.
// With IE and Firefox it also works sometimes (seemingly with very simple pages where you have
// only a <pre> or something like that) but I don't know when. This hack seems to work always.
var scrollTop = (document.documentElement && document.documentElement.scrollTop) || document.body.scrollTop;
// Grodriguez's fix for scrollHeight:
// accounting for cases where html/body are set to height:100%
var scrollHeight = (document.documentElement && document.documentElement.scrollHeight) || document.body.scrollHeight;
// >= is needed because if the horizontal scrollbar is visible then window.innerHeight includes
// it and in that case the left side of the equation is somewhat greater.
var scrolledToBottom = (scrollTop + window.innerHeight) >= scrollHeight;
// As a bonus: how to scroll to the bottom programmatically by keeping the horizontal scrollpos:
// Since window.innerHeight includes the height of the horizontal scrollbar when it is visible
// the correct vertical scrollTop would be
// scrollHeight-window.innerHeight+sizeof(horizontal_scrollbar)
// Since we don't know the visibility/size of the horizontal scrollbar
// we scroll to scrollHeight that exceeds the value of the
// desired scrollTop but it seems to scroll to the bottom with all browsers
// without problems even when the horizontal scrollbar is visible.
var scrollLeft = (document.documentElement && document.documentElement.scrollLeft) || document.body.scrollLeft;
window.scrollTo(scrollLeft, scrollHeight);
((document.documentElement && document.documentElement.scrollHeight) || document.body.scrollHeight) instead of just document.body.scrollHeight to account for cases where html/body are set to height:100% –
Flageolet document.body.scrollTop. Thanks. –
Kronstadt const scrolledToBottom = (window.innerHeight + window.scrollY) >= document.documentElement.scrollHeight –
Dyne This works
window.onscroll = function() {
// @var int totalPageHeight
var totalPageHeight = document.body.scrollHeight;
// @var int scrollPoint
var scrollPoint = window.scrollY + window.innerHeight;
// check if we hit the bottom of the page
if(scrollPoint >= totalPageHeight)
{
console.log("at the bottom");
}
}
If you're looking to support older browsers (IE9) replace window.scrollY with window.pageYOffset
If you're setting height: 100% on some container <div id="wrapper">, then the following code works (tested in Chrome):
var wrapper = document.getElementById('wrapper');
wrapper.onscroll = function (evt) {
if (wrapper.scrollTop + window.innerHeight >= wrapper.scrollHeight) {
console.log('reached bottom!');
}
}
window.onscroll = function(ev) {
if ((window.innerHeight + Math.ceil(window.pageYOffset)) >= document.body.offsetHeight) {
alert("you're at the bottom of the page");
}
};
This Answer will fix edge cases, this is because pageYOffset is double while innerHeight and offsetHeight are long, so when the browser gives you the info, you may be a pixel short.
For example: on bottom of the page we have
true window.innerHeight = 10.2
true window.pageYOffset = 5.4
true document.body.offsetHeight = 15.6
Our calculation then becomes: 10 + 5.4 >= 16 which is false
To fix this we can do Math.ceil on the pageYOffset value.
Hope that helps.
Try this method if you've had no luck with the others.
window.onscroll = function() {
const difference = document.documentElement.scrollHeight - window.innerHeight;
const scrollposition = document.documentElement.scrollTop;
if (difference - scrollposition <= 2) {
alert("Bottom of Page!");
}
}I've just started looking at this and the answers here helped me, so thanks for that. I've expanded a little so that the code is safe all the way back to IE7:
Hope this proves useful for someone.
<!DOCTYPE html>
<html>
<head>
<style>
div {
height: 100px;
border-bottom: 1px solid #ddd;
}
div:nth-child(even) {
background: #CCC
}
div:nth-child(odd) {
background: #FFF
}
</style>
</head>
<body>
<div></div><div></div><div></div><div></div><div></div><div></div><div></div>
<div></div><div></div><div></div><div></div><div></div><div></div><div></div>
<div></div><div></div><div></div><div></div><div></div><div></div><div></div>
<div></div><div></div><div></div><div></div><div></div><div></div><div></div>
<div></div><div></div><div></div><div></div><div></div><div></div><div></div>
</body>
<script type="text/javascript">
console.log("Doc Height = " + document.body.offsetHeight);
console.log("win Height = " + document.documentElement.clientHeight);
window.onscroll = function (ev) {
var docHeight = document.body.offsetHeight;
docHeight = docHeight == undefined ? window.document.documentElement.scrollHeight : docHeight;
var winheight = window.innerHeight;
winheight = winheight == undefined ? document.documentElement.clientHeight : winheight;
var scrollpoint = window.scrollY;
scrollpoint = scrollpoint == undefined ? window.document.documentElement.scrollTop : scrollpoint;
if ((scrollpoint + winheight) >= docHeight) {
alert("you're at the bottom");
}
};
</script>
</html>
New solution.
One issue stems from a lack of a standard main scrolling element. Recently implemented document.scrollingElement can be used to attempt to overcome this. Below is a cross-browser solution with fallback:
function atEnd() {
var c = [document.scrollingElement.scrollHeight, document.body.scrollHeight, document.body.offsetHeight].sort(function(a,b){return b-a}) // select longest candidate for scrollable length
return (window.innerHeight + window.scrollY + 2 >= c[0]) // compare with scroll position + some give
}
function scrolling() {
if (atEnd())
//do something
}
window.addEventListener('scroll', scrolling, {passive: true});
As above mentioned code may not work on all the devices and browsers. Below is the tested working code that will compatible with all the major devices (iPhone, Android, PC) in all the browsers (Chrome, IE, Edge, Firefox, and Safari).
window.onscroll = function(ev) {
var pageHeight = Math.max(document.body.scrollHeight, document.body.offsetHeight, document.documentElement.clientHeight, document.documentElement.scrollHeight, document.documentElement.offsetHeight );
if ((window.innerHeight + window.scrollY) >= pageHeight) {
console.log("You are at the bottom of the page.");
}
};<html>
<body>
<div style="width:100%; height:1500px">
<p>Keep scrolling the page till end...</p>
</div>
</body>
</html>The simplest way using vanilla javascript
container.addEventListener('scroll', (e) => {
var element = e.target;
if (element.scrollHeight - element.scrollTop - element.clientHeight <= 0) {
console.log('scrolled to bottom');
}
});
$(document).ready(function(){
$('.NameOfYourDiv').on('scroll',chk_scroll);
});
function chk_scroll(e)
{
var elem = $(e.currentTarget);
if (elem[0].scrollHeight - elem.scrollTop() == elem.outerHeight())
{
alert("scrolled to the bottom");
}
}
if you love jquery
$(window).scroll(function() {
if($(window).scrollTop() + $(window).height() >= $(document).height()) {
// doSomethingHere();
}
});
Using defaultView and documentElement with functional code snippet embedded:
const { defaultView } = document;
const { documentElement } = document;
const handler = evt => requestAnimationFrame(() => {
const hitBottom = (() => (defaultView.innerHeight + defaultView.pageYOffset) >= documentElement.offsetHeight)();
hitBottom
? console.log('yep')
: console.log('nope')
});
document.addEventListener('scroll', handler);<pre style="height:110vh;background-color:fuchsia">scroll down</pre>const handleScroll = () => {
if (Math.round(window.scrollY + window.innerHeight) >= Math.round(document.body.scrollHeight)) {
onScroll();
}
};
This code worked for me in Firefox and IE as well.
I made this function for Mobile Devices and Desktop try it, It's work for me some of comment here is not working on Mobile/Android devices, BTW Thank You for this question. Keep it Up coders!
window.addEventListener("scroll", function(el) {
const scrollY = window.scrollY + window.innerHeight + 2;
const bodyScroll = document.body.offsetHeight;
console.log("Scroll Y : " + scrollY);
console.log("Body : " + bodyScroll);
if(scrollY >= bodyScroll){
alert("Bottom Page");
}
})
Surprisingly none of the solutions worked for me. I think it's because my css was messed up, and body didn't wrap around all of the content when using height: 100% (don't know why yet). However while looking for a solution I've came up with something well... basically the same, but maybe it's worth to look at - I'm new into programming so sorry if it's doing the same slower, is less supported or something like that...
window.onscroll = function(evt) {
var check = (Element.getBoundingClientRect().bottom - window.innerHeight) <= 0;
if (check) { console.log("You're at the bottom!"); }
};
You can check if the combined result of the window's height and scroll top is bigger than that of the body
if (window.innerHeight + window.scrollY >= document.body.scrollHeight) {}
Two solutions I found that worked for me:
window.addEventListener('scroll', function(e) {
if (
window.innerHeight + document.documentElement.scrollTop ===
document.documentElement.offsetHeight
) {
console.log('You are at the bottom')
}
})
And the other:
window.addEventListener('scroll', function(e) {
if (
window.innerHeight + window.pageYOffset ===
document.documentElement.offsetHeight
) {
console.log('You are at the bottom')
}
})
This check works ok for me with lazy loading
window.onscroll = () => {
if (Math.ceil(window.innerHeight + window.scrollY) >= document.body.offsetHeight) {
alert('Bottom!');
}
};
This worked for me note to include the Math.round() function to round off the height to the nearest integer.
window.addEventListener('scroll', function(e) {
if (Math.round(window.innerHeight + window.scrollY) >= document.body.scrollHeight) {
alert('bottom');
}
});
I saw the accepted answer didn't take into account margins at the bottom and/or top of the page, so here's my answer:
const body = document.body;
const paddingHeight = body.scrollHeight;
const computedStyle = getComputedStyle(body);
const marginTop = parseInt(computedStyle.getPropertyValue("margin-top").match(/[0-9]+/)[0]);
const marginBottom = parseInt(computedStyle.getPropertyValue("margin-bottom").match(/[0-9]+/)[0]);
const borderTop = parseInt(computedStyle.getPropertyValue("border-top").match(/[0-9]+/)[0]);
const borderBottom = parseInt(computedStyle.getPropertyValue("border-bottom").match(/[0-9]+/)[0]);
const bodyHeight = marginTop + borderTop + paddingHeight + borderBottom + marginBottom;
window.onscroll = () => {
if ((window.innerHeight + window.scrollY) >= bodyHeight) {
console.log("YAY! :)");
}
};
If the website uses infinite scrolling you probably also want to wait for the height to update before checking, with something like this:
await new Promise(resolve => setTimeout(resolve, 3000));
I simply place a small image at the bottom of my page with loading="lazy" so the browser is only loading it when the user scrolls down. The image then trigers a php counter script which returns a real image
<img loading="lazy" src="zaehler_seitenende.php?rand=<?=rand(1,1000);?>">
<?php
@header("Location: https://domain.de/4trpx.gif");
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