How Can I Determine the Scrollbar Position in JavaScript?

JavaScript-Based Determination of Scrollbar Position

Detecting the position of the browser's scrollbar is a fundamental task for comprehending the viewport's current location. Let's delve into the depths of JavaScript to explore this challenge.

Initially, one might consider determining the thumb's position along the track and calculating its height as a percentage of the track's overall height. However, JavaScript provides a more straightforward approach.

To retrieve the vertical and horizontal scroll offsets, employ the element.scrollTop and element.scrollLeft properties. If you're interested in the entire page, use document.body as the element. For percentage calculations, compare these offsets to element.offsetHeight and element.offsetWidth (element remains the body or any other pertinent element).

Example:

// Get the vertical scroll offset
let verticalOffset = document.body.scrollTop;

// Get the horizontal scroll offset
let horizontalOffset = document.body.scrollLeft;

// Calculate the vertical scroll percentage
let verticalPercentage = verticalOffset / document.body.offsetHeight * 100;

// Calculate the horizontal scroll percentage
let horizontalPercentage = horizontalOffset / document.body.offsetWidth * 100;

// Utilize the obtained percentages for your desired functionality

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