[removed] How to detect if browser window is scrolled to bottom?

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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

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19条回答

忘掉有多难

2020-11-22 16:37

Try this method if you've had no luck with the others.

window.onscroll = function()
{
    
    
    
    
     var difference = document.documentElement.scrollHeight - window.innerHeight;
     var scrollposition = document.documentElement.scrollTop;
     
     if (difference - scrollposition <= 2)
     {
     
            alert("Bottom of Page!"); 
        
     
     }
    

    
}

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一向

2020-11-22 16:39
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) ? true : false;
  if (check) { console.log("You're at the bottom!"); }
};
```
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- 加载中...

你的背包

2020-11-22 16:40

Updated code for all major browsers support (include IE10 & IE11)

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");
    }
};

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Note for mac

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.

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野趣味

2020-11-22 16:40

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!');
  }
}

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花落未央

2020-11-22 16:41

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')
    }
  })

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迷失自我

2020-11-22 16:42

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.

Here, have a Fiddle ;)

    <!DOCTYPE html>
<html>
<head>
    <style>
        div {
            height: 100px;
            border-bottom: 1px solid #ffffd;
        }

        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>

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