Is there a reason why el.scrollTop leaves a gap at the top of the screen for an element?

Question

Is there a reason why el.scrollTop leaves a gap at the top of the screen for an element?

I have a basic conversation-body element with the property overflow: auto.
I am trying to make this div scroll to the top by its own height.

This is what I have tried so far:

//accessing the element 
var parent = document.getElementsByClassName('conversation-body')[0]; 
//getting the height
var parentHeight = parent.getBoundingClientRect().bottom - parent.getBoundingClientRect().top;
//attempting to scroll it up
parent.scrollTop += parentHeight;

It does work, but there is some extra space at the top.
Any idea why this is happening?
Here is the website link where you can try the code in the console.

https://i.sstatic.net/JBhfl.png

javascript

Answer 1

Answer №1

Are you looking to show the next section of the page based on the parent's height?

If that's the case, consider using offsetHeight instead of manually calculating it from the rectangle coordinates.

var parent = document.getElementsByClassName('conversation-body')[0]; //retrieve element
parent.scrollTop += parent.offsetHeight; //no need for height calculations

Answer 2

Are you looking to show the next section of the page based on the parent's height?

If that's the case, consider using offsetHeight instead of manually calculating it from the rectangle coordinates.

var parent = document.getElementsByClassName('conversation-body')[0]; //retrieve element
parent.scrollTop += parent.offsetHeight; //no need for height calculations

Answer 3

Answer №2

It seems like the issue lies in how you are obtaining the height of the parent element. Instead of using getBoundingClientRect, I usually rely on offsetHeight. To resolve this, you can try the following approach:

var container = document.getElementsByClassName('conversation-body')[0]; //selecting the element
var containerHeight = container.offsetHeight; //calculating the height
container.scrollTop += containerHeight; //attempting to scroll upwards

Answer 4

It seems like the issue lies in how you are obtaining the height of the parent element. Instead of using getBoundingClientRect, I usually rely on offsetHeight. To resolve this, you can try the following approach:

var container = document.getElementsByClassName('conversation-body')[0]; //selecting the element
var containerHeight = container.offsetHeight; //calculating the height
container.scrollTop += containerHeight; //attempting to scroll upwards

Is there a reason why el.scrollTop leaves a gap at the top of the screen for an element?

Answer №1

Answer №2

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