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Scroll part of page till the very last section in the div in selenium

I have scenario where a check box will be enabled only when scroll section of div is fully scrolled.
Using above techniques and all the lookups I was able to scroll to last element of the div. But the problem is, there is some margin/padding which is left between last element and the scrolling div end section which is not making the checkbox to be enabled. If I give
WebElement element = driver.findElement(By.xpath("xpath"));
((JavascriptExecutor)
driver).executeScript("arguments[0].scrollIntoView(true);", element);
I am able to kind of focus on the scrolling div section, but not able to scroll.
Actions actions = new Actions(driver);
actions.moveToElement(element);
actions.perform();
Here, am able to move to last element of the div. but not end of scrolling div so, checkbox is still disabled.
js.executeScript("window.scrollBy(0,100);")
is scrolling the entire window which is expected. So, is there a way to explicitly scroll part of div?
Is there any tweaks that can be done in order to make the checkbox enabled?

First, Let's note some key ideas
key difference between scrollTo & scrollBy is that
scrollTo scrolls to a specific part of the website as you expect.
scrollBy scrolls to specific part FROM the current position.
You need to scrollTo not scrollBy, now let's scroll to the end of your div
Second important note is that the padding is considered a part of the element unlike margin, if you get an element's height, the padding is in that height
now get your element as a javascript object and assign it to a variable.
so Assign this
driver.executeScript("const myElem = document.getElementById('ELEMENT_ID'); return myElem")
to a WebElement object as this code will return your element, if it has no ID use any other JS method to get your element class or whatever.
we called it myElem so we can still refernce it with JS with that name, execute this on the driver
window.scrollTo(0, myElem.offsetTop + myElem.offsetHeight )
this scrolls to "your element's top coordinate" + "your element's height" which is just below it.
if the website was smart enough to detect that this scrolling was robotic, you can use
window.scrollTo({
top: myElem.offsetTop + myElem.offsetHeight,
left: 0,
behavior: 'smooth'
});
if there's still margin, get it the same way then add it to the top offset.

Mechanism to update scroll index based on scroll position

I notice a feature on this site:
and feature on this site:
If you scroll the items in the middle section, the left menu title will update based on the position of middle section scroll position.
I know it has to handle the scroll event in the middle section, but then what?
Does it just use an existing library? What is the mechanism to implement this feature?

Ok so here we have two things to deal with :
We must know when the top of a specific section is at the top of the viewport (your webrowser window)
Then and only then when the specific section if at the top we update the menu according to it
You can easily do that by putting a specific ID to your section, then get the offset.top() position of that element and listening to the window.onscroll and when the current scroll position is equal to the offset.top() position of your element you will add maybe an active class to your menu
like so
<div id="my-section"></div>
var mySection = document.getElementById("my-section"),
mySectionTopPosition = mySection.offsetTop,
currentWindowScrollPosition = window.pageYOffset;
Then if currentWindowScrollPostion === mySectionTopPosition you will do something accordingly
See this : Getting Window X Y position for scroll and On Scroll Animation using jQuery

Getting different height click position by scrolling main page

I'm trying to create a spot the difference game with jQuery.
Basically, several images stacked, positioned absolutely in a container. Above the container there is the page header with a logo and a menu, which takes altogather about 120px above the images container.
When someone clicks an area inside the image, I put there a new div, with either a correct (V) mark, or a wrong (red X).
I'm trying to get the position of the click inside the element, using the following code (the following used event variable e is returned in the click event just to be clear):
var parentOffset = $(this).parent().offset();
var topOffset = e.clientY - offset.top;
My problem is that the offset from the top changes when I scroll the page down a little to the footer area, and then I do not position the new marker div in the correct height.
When I'm scrolled to the top of the page, the mark is position correctly.
I've created such a game before, but can't understand why suddenly the calculation is wrong :\
Seems that I get the distance minus the scroll height, but not sure.
Thanks for your insight,
Yanipan

I played around with Firebug a little and it looks like e.originalEvent.layerY is exactly what you're looking for.
It always shows the absolute coordinates of your click within the clicked object, no matter where the screen is scrolled.

How do I set scroll top of a web page

I am facing a problem with set scroll bar top position. Actually what I need is; I am using a JQuery Keyboard plugin where for all the elements I need to display the virtual keyboard at the center bottom of the page and its done.
But the problem I am having is when I have a input field near to the bottom of the page where that page does not display the scroll bar (It means there is no need of overflow because all the elements I have is visible in my page). Since I am displaying the virtual keyboard at the bottom of the page and when the focused element also is at the bottom of the page I need to initiate the scroll bar and page should go up by scroll down automatically so active input field element is visible to me.
I tried to set the scroll bar by using this
$(document).scrollTop(_scroll_top + (_el_top + _el_height) - _keyboard_top);
Where _scroll_top is my current scroll top position, _el_top is focused elements top position, _el_height is my focused elements height and _keyboard_top is the top position of the keyboard.
Now the problem is when I have a more height page (It means scroll bar size is small i.e. scroll bar size may be around 60% of the screen.Height) scrollTop is correctly working and I can see the active input element even though keyboard is visible. But when I have small height of a page (Example: scroll bar size is around 90% or it may be same size of screen.Height) scrollTop is is not working correctly so the active input element is not visible and it is behind to virtual keyboard.
How can I set the scroll top correctly so I will be able to see the active input element then at the bottom of that element I can see virtual keyboard.
Please see the attached image. That is where actually active input element should be displayed.
First Image is Before Enable the keyboard: Just see the element's position, sroll top
Second Image is After Enable the keyboard: Just see the element's position, sroll top
This is what I need when my scroll bar size is big (Around 90% of the screen.Height)
Thanks in advance.
P.S: I am extremely sorry if I confuse by the way I expressed my question.

use jQuery('html,body').scrollTop('other things here');

Thanks for the responses.
I have found the solution for my question.
At the bottom of the page I have created a dummy div element.
<div id="scroll_dummy"></div>
Initially this div will be having zero height. I applied the height of the keyboard to this div. As a result your page size will be increased so it can easily move the scroll top. At the time of close again revert back this style.
Then at the place of I am applying scrollTop I have done this.
$("#scroll_dummy").css("height", _keyboard_height);
$(document).scrollTop(_scroll_top + (_el_top + _el_height) - _keyboard_top);
Where
_scroll_top : scroll top position
_el_top : active element top position
_el_height : active element height
_keyboard_top : keyboard element top position
_keyboard_height : keyboard element height position
Done with this... :)

Web-page boundary values

I have a "box" popup that appears on mouseover for some links. The box is about 300px tall and the top side of the box is on the same level as the link position, however some of these links are at the lowest scrollable part of the page, thus the popup will be cut off.
Question
What values are used to detect the bottom of the page, or remaining scrollable distance to the bottom so that you can shift the popup as required?
I'm using jQuery, but a generic JavaScript solution is also welcome for reference.
Thank you.

Basically you want to find the bottom of the viewport relative to the document, and then compare them to the coordinates of the incoming event.
function handler(event) {
var bottomOfViewport = $(window).scrollTop() + $(window).height();
var bottomOfBox = event.pageY + HEIGHT_OF_BOX;
if ( bottomOfViewport < bottomOfBox )
// code to handle overflow condition
}
Thankfully, the pageX and pageY properties are relative to the document. Similar holds for the x-axis.