Detecting when user scrolls to bottom of div with jQuery

Question

There are some properties/methods you can use:

$().scrollTop()//how much has been scrolled
$().innerHeight()// inner height of the element
DOMElement.scrollHeight//height of the content of the element

So you can take the sum of the first two properties, and when it equals to the last property, you've reached the end:

jQuery(function($) {
    $('#flux').on('scroll', function() {
        if($(this).scrollTop() + $(this).innerHeight() >= $(this)[0].scrollHeight) {
            alert('end reached');
        }
    })
});

http://jsfiddle.net/doktormolle/w7X9N/

Edit: I've updated 'bind' to 'on' as per:

As of jQuery 1.7, the .on() method is the preferred method for attaching event handlers to a document.

I found a solution that when you scroll your window and end of a div shown from bottom gives you an alert.

$(window).bind('scroll', function() {
    if($(window).scrollTop() >= $('.posts').offset().top + $('.posts').outerHeight() - window.innerHeight) {
        alert('end reached');
    }
});

In this example if you scroll down when div (.posts) finish its give you an alert.

Though the question was asked 5.5 years ago, still it is more than relevant in today's UI/UX context. And I would like to add my two cents.

var element = document.getElementById('flux');
if (element.scrollHeight - element.scrollTop === element.clientHeight)
    {
        // element is at the end of its scroll, load more content
    }

Source: https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollHeight#Determine_if_an_element_has_been_totally_scrolled

Some elements won't allow you to scroll the full height of the element. In those cases you can use:

var element = docuement.getElementById('flux');
if (element.offsetHeight + element.scrollTop === element.scrollHeight) {
  // element is at the end of its scroll, load more content
}

Just an additional note here as I found this when looking for a solution for a fixed div that I want to scroll. For my scenario I found that its preferable to take into account the padding on the div so I can hit the end exactly. So expanding on @Dr.Molle's answer I add the following

$('#flux').bind('scroll', function() {
    var scrollPosition = $(this).scrollTop() + $(this).outerHeight();
    var divTotalHeight = $(this)[0].scrollHeight 
                          + parseInt($(this).css('padding-top'), 10) 
                          + parseInt($(this).css('padding-bottom'), 10)
                          + parseInt($(this).css('border-top-width'), 10)
                          + parseInt($(this).css('border-bottom-width'), 10);

    if( scrollPosition == divTotalHeight )
    {
      alert('end reached');
    }
  });

That'll give you the precise location, including padding and borders

this worked for me though

$(window).scroll(function() {
  if ($(window).scrollTop() >= (($(document).height() - $(window).height()) - $('#divID').innerHeight())) {
    console.log('div reached');
  }
});

If you need to use this on a div that has overflow-y as hidden or scroll, something like this may be what you need.

if ($('#element').prop('scrollHeight') - $('#element').scrollTop() <= Math.ceil($('#element').height())) {
    at_bottom = true;
}

I found ceil was needed because prop scrollHeight seems to round, or perhaps some other reason causing this to be off by less than 1.

If you are not using Math.round() function the solution suggested by Dr.Molle will not work in some cases when a browser window has a zoom.

For example $(this).scrollTop() + $(this).innerHeight() = 600

$(this)[0].scrollHeight yields = 599.99998

600 >= 599.99998 fails.

Here is the correct code:

jQuery(function($) {
    $('#flux').on('scroll', function() {
        if(Math.round($(this).scrollTop() + $(this).innerHeight(), 10) >= Math.round($(this)[0].scrollHeight, 10)) {
            alert('end reached');
        }
    })
});

You may also add some extra margin pixels if you do not need a strict condition

var margin = 4

jQuery(function($) {
    $('#flux').on('scroll', function() {
        if(Math.round($(this).scrollTop() + $(this).innerHeight(), 10) >= Math.round($(this)[0].scrollHeight, 10) - margin) {
            alert('end reached');
        }
    })
});