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How to stop scroll when dynamic div ends

I want to stop scroll after a dynamic div reaches its end. This div will be holding dynamic content so the size never stays the same. I know how to lock in position when scroll hits a pre-defined height, but not sure how to do it when the hight is constantly changing. here's what i'm using for my standard locking scroll when it hits specific point:
var profile_rc = $("#profile-rc");
$(window).scroll(function() {
var scroll = $(window).scrollTop();
if (scroll >= 285) {
profile_rc.addClass("p-right-column");
} else {
profile_rc.removeClass("p-right-column");
}
});

Looks like you are using jQuery, the following 2 examples might help.
Detecting dynamic height of screen
<script>
$(function(){
var windowHeight = $(window).height();
$(window).resize(function() {
windowHeight = $(window).height();
console.log(windowHeight);
});
});
<script>
Detecting dynamic height of a div
<script>
$(function(){
var divHeight = $('#your-div-id').css("height");
$( window ).on("resize", function() {
divHeight = $('#your-div-id').css("height");
console.log(divHeight);
});
});
</script>

I got it to work doing this:
$(window).scroll(function() {
var divHeight = $('#farleft-cont').outerheight(true);
var ycbc = $('#target-div');
var scroll = $(window).scrollTop();
if (scroll >= divHeight) {
ycbc.addClass("target-div-fixed");
} else {
ycbc.removeClass("target-div-fixed");
}
});

Using Jquery to find HTML element / content which occupies pixel position on page

I'm looking to find the HTML element or content which occupies the pixel position on a page. I am using currently using jQuery to find the scrollTop() position:
$(window).scroll(function (event) {
var scroll = $(window).scrollTop();
console.log(scroll);
// Do something
});
to understand the $(window).scrollTop() position, but I'd like to know what occupies the space. E.g., if a user scrolls to '300', what HTML element or content is there?
Scrolltop code from How to detect scroll position of page using jQuery

function checkElement(el){
var windowHeight = $(window).height();
var scroll = $(window).scrollTop();
var elementPosition = el.height() + el.position().top;
if (elementPosition > scroll && elementPosition < windowHeight + scroll){
return true;
}
return false;
}

Scroll div until top of footer

i've been looking for this for a couple of days but still no joy!
I would like to have a div scroll in a fixed position until it gets to the top of the footer.
Here is a fiddle of what i have so far: http://jsfiddle.net/danieljoseph/uk4mC/
I'm using this JQuery code but this uses pixels to determine when the div stops. I would like to use the top of the footer as the stop point:
$(document).scroll(function() {
var scrollVal = $(document).scrollTop();
$('#floating-container').css('top',scrollVal+'px');
if (scrollVal < 50) {
$('#floating-container').css('top','50px');
}
if (scrollVal > 2347) {
$('#floating-container').css('top','2347px');
}
});
The issue is that i am using a CMS and the client will be adding text to the page so the second value will change depending on what they add.
I hope i've been clear enough! please let me know if you require more details.
Thanks,

You have to check in the scroll event if the bottom edge of your div is lower than the footer. If it is, place the div at the position of the footer minus the height of the div.
$(function(){
var container = $('#floating-container');
var minTop = $('header').outerHeight();
var maxTop = $('footer').offset().top - container.outerHeight();
$(document).scroll(function() {
var scrollVal = $(document).scrollTop();
container.css('top', scrollVal);
if (scrollVal < minTop) {
container.css('top', minTop);
}
if (container.offset().top > maxTop ) {
container.css('top', maxTop );
}
});
});
Fiddle
And, a much shorter variant of the script above:
$(function(){
var container = $('#floating-container');
var minTop = $('header').outerHeight();
var maxTop = $('footer').offset().top - container.outerHeight();
$(document).scroll(function() {
container.css('top', Math.min( Math.max(minTop, $(document).scrollTop()), maxTop ));
});
});
Short version fiddle.

Just read the position of the footers top when you load the page:
http://jsfiddle.net/uk4mC/1/
var footerTop = $('#text-block').position().top;
and then use that as a trigger:
if (scrollVal < footerTop) { }

jQuery .scroll not picking up

I'm trying create an alert saying "True" when the user scrolls past the "#topp" element, yet it isn't doing anything, the element is just supposed to be a tiny div at the top of the page.
HTML
<div id="topp"></div>
jQuery
$(window).scroll(function() {
var vpH = $(window).height(),
st = $(window).scrollTop(),
y = $('#topp').offset().top;
if(y > (st + vpH)) alert('true');
});

Why do you need the window height? If you have the top and the scroll to top variables then theirs no need for the height of the window.
$(document).scroll(function()
{
var scrollTop = $(window).scrollTop();
var toppOffset = $('#topp').offset().top;
if(toppOffset > scrollTop)
alert('true');
});​
A clearer representation http://jsfiddle.net/zDpw3/1/

Auto-scroll to the bottom of a div

I have a div with overflow set to scroll which essentially streams data line by line off a file. I'd like to scroll automatically to the bottom of the div whenever the stream overflows, but without using a "Click here to scroll to bottom" button.
I already know of the scrollTop = scrollHeight solution, but that requires some kind of event trigger on the client's side. I don't want this element to be interactive; it should scroll by itself.
Is there any way to achieve this?

A lot of the scrollHeight implementations didn't work for me, offsetHeight seemed to do the trick.
Pretty sure that scrollHeight tries to move it to the bottom of the height of the static element, not the height of the scrollable area.
var pane = document.getElementById('pane');
pane.scrollTop = pane.offsetHeight;

There's no way to automatically scroll an element to the bottom. Use element.scrollTop = element.scrollHeight.
If you don't know when the element is going to resize, you could add a poller:
(function(){
var element = document.getElementById("myElement");
var lastHeight = element.scrollHeight;
function detectChange(){
var currentHeight = element.scrollHeight;
if(lastHeight != currentHeight){
element.scrollTop = currentHeight;
lastHeight = currentHeight;
}
}
detectChange();
setInterval(detectChange, 200); //Checks each 200ms = 5 times a second
})();

Some old code of mine with a running example that will stay at the bottom when new content is added, if the user scrolls it will not more it to the bottom.
var chatscroll = new Object();
chatscroll.Pane =
function(scrollContainerId)
{
this.bottomThreshold = 25;
this.scrollContainerId = scrollContainerId;
}
chatscroll.Pane.prototype.activeScroll =
function()
{
var scrollDiv = document.getElementById(this.scrollContainerId);
var currentHeight = 0;
if (scrollDiv.scrollHeight > 0)
currentHeight = scrollDiv.scrollHeight;
else
if (objDiv.offsetHeight > 0)
currentHeight = scrollDiv.offsetHeight;
if (currentHeight - scrollDiv.scrollTop - ((scrollDiv.style.pixelHeight) ? scrollDiv.style.pixelHeight : scrollDiv.offsetHeight) < this.bottomThreshold)
scrollDiv.scrollTop = currentHeight;
scrollDiv = null;
}