javascript: detect scroll end

I have a div layer with overflow set to scroll.

When scrolled to the bottom of the div, I wanna run a function.

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The accepted answer was fundamentally flawed, it has since been deleted. The correct answer is:

function scrolled(e) {
  if (myDiv.offsetHeight + myDiv.scrollTop >= myDiv.scrollHeight) {
    scrolledToBottom(e);
  }
}

Tested this in Firefox, Chrome and Opera. It works.

I could not get either of the above answers to work so here is a third option that works for me! (This is used with jQuery)

if (($(window).innerHeight() + $(window).scrollTop()) >= $("body").height()) {
    //do stuff
}

Hope this helps anyone!

OK Here is a Good And Proper Solution

You have a Div call with an id="myDiv"

so the function goes.

function GetScrollerEndPoint()
{
   var scrollHeight = $("#myDiv").prop('scrollHeight');
   var divHeight = $("#myDiv").height();
   var scrollerEndPoint = scrollHeight - divHeight;

   var divScrollerTop =  $("#myDiv").scrollTop();
   if(divScrollerTop === scrollerEndPoint)
   {
       //Your Code 
       //The Div scroller has reached the bottom
   }
}

if ((window.innerHeight + window.scrollY) >= document.body.offsetHeight)
{
//your code here
}

I too searched it and even after checking all comments here and more, this is the solution to check if reached the bottom or not.

This worked for me:

$(window).scroll(function() {
  buffer = 40 // # of pixels from bottom of scroll to fire your function. Can be 0
  if ($(".myDiv").prop('scrollHeight') - $(".myDiv").scrollTop() <= $(".myDiv").height() + buffer )   {
	doThing();
  }
});

Must use jQuery 1.6 or higher

I found an alternative that works.

None of these answers worked for me (currently testing in FireFox 22.0), and after a lot of research I found, what seems to be, a much cleaner and straight forward solution.

Implemented solution:

function IsScrollbarAtBottom() {
    var documentHeight = $(document).height();
    var scrollDifference = $(window).height() + $(window).scrollTop();
    return (documentHeight == scrollDifference);
}

Resource: http://jquery.10927.n7.nabble.com/How-can-we-find-out-scrollbar-position-has-reached-at-the-bottom-in-js-td145336.html

Regards

I created a event based solution based on Bjorn Tipling's answer:

(function(doc){
    'use strict';

    window.onscroll = function (event) {
        if (isEndOfElement(doc.body)){
            sendNewEvent('end-of-page-reached');
        }
    };

    function isEndOfElement(element){
        //visible height + pixel scrolled = total height 
        return element.offsetHeight + element.scrollTop >= element.scrollHeight;
    }

    function sendNewEvent(eventName){
        var event = doc.createEvent('Event');
        event.initEvent(eventName, true, true);
        doc.dispatchEvent(event);
    }
}(document));

And you use the event like this:

document.addEventListener('end-of-page-reached', function(){
    console.log('you reached the end of the page');
});

BTW: you need to add this CSS for javascript to know how long the page is

html, body {
    height: 100%;
}

Demo: http://plnkr.co/edit/CCokKfB16iWIMddtWjPC?p=preview

This will actually be the correct answer:

function scrolled(event) {
   const container = event.target.body
   const {clientHeight, scrollHeight, scrollY: scrollTop} = container

   if (clientHeight + scrollY >= scrollHeight) {
    scrolledToBottom(event);
   }
}

The reason for using the event is up-to-date data, if you'll use a direct reference to the div you'll get outdated scrollY and will fail to detect the position correctly.

additional way is to wrap it in a setTimeout and wait till the data updates.

Take a look at this example: MDN Element.scrollHeight

I recommend that check out this example: stackoverflow.com/a/24815216... which implements a cross-browser handling for the scroll action.

You may use the following snippet:

//attaches the "scroll" event
$(window).scroll(function (e) {
    var target = e.currentTarget,
        scrollTop = target.scrollTop || window.pageYOffset,
        scrollHeight = target.scrollHeight || document.body.scrollHeight;
    if (scrollHeight - scrollTop === $(target).innerHeight()) {
      console.log("► End of scroll");
    }
});

Since innerHeight doesn't work in some old IE versions, clientHeight can be used:

$(window).scroll(function (e){
    var body = document.body;	 
    //alert (body.clientHeight);
    var scrollTop = this.pageYOffset || body.scrollTop;
    if (body.scrollHeight - scrollTop === parseFloat(body.clientHeight)) {
        loadMoreNews();
    }
});

To do the same in React/JSX, here is the snippet.

export const scrolledToEnd = event => {
  const container = event.target;

  if (container.offsetHeight + container.scrollTop >= container.scrollHeight) {
    return true;
  }
  return false;
};

And in your component add

<Component onScroll={scrolledToEnd}>