jQuery Scroll to bottom of page/iframe

Question

If you want a nice slow animation scroll, for any anchor with href="#bottom" this will scroll you to the bottom:

$("a[href='#bottom']").click(function() {
  $("html, body").animate({ scrollTop: $(document).height() }, "slow");
  return false;
});

Feel free to change the selector.

scrollTop() returns the number of pixels that are hidden from view from the scrollable area, so giving it:

$(document).height()

will actually overshoot the bottom of the page. For the scroll to actually 'stop' at the bottom of the page, the current height of the browser window needs subtracting. This will allow the use of easing if required, so it becomes:

$('html, body').animate({ 
   scrollTop: $(document).height()-$(window).height()}, 
   1400, 
   "easeOutQuint"
);

For example:

$('html, body').scrollTop($(document).height());

After this thread didn't work out for me for my specific need (scrolling inside a particular element, in my case a textarea) I found this out in the great beyond, which could prove helpful to someone else reading this discussion:

Alternative on planetcloud

Since I already had a cached version of my jQuery object (the myPanel in the code below is the jQuery object), the code I added to my event handler was simply this:

myPanel.scrollTop(myPanel[0].scrollHeight - myPanel.height());

(thanks Ben)

A simple function that jumps (instantly scrolls) to the bottom of the whole page. It uses the built-in .scrollTop(). I haven’t tried to adapt this to work with individual page elements.

function jumpToPageBottom() {
    $('html, body').scrollTop( $(document).height() - $(window).height() );
}

If you don't care about animation, then you don't have to get the height of the element. At least in all the browsers I've tried, if you give scrollTop a number that's bigger than the maximum, it'll just scroll to the bottom. So give it the biggest number possible:

$(myScrollingElement).scrollTop(Number.MAX_SAFE_INTEGER);

If you want to scroll the page, rather than some element with a scrollbar, just make myScrollingElement equal to 'body, html'.

Since I need to do this in several places, I've written a quick and dirty jQuery function to make it more convenient, like this:

(function($) {
  $.fn.scrollToBottom = function() {
    return this.each(function (i, element) {
      $(element).scrollTop(Number.MAX_SAFE_INTEGER);
    });
  };
}(jQuery));

So I can do this when I append a buncho' stuff:

$(myScrollingElement).append(lotsOfHtml).scrollToBottom();

This one worked for me:

var elem = $('#box');
if (elem[0].scrollHeight - elem.scrollTop() == elem.outerHeight()) {
  // We're at the bottom.
}