How Can I Get the Dimensions of Browser Scrollbars Using JavaScript?

Obtaining Browser Scrollbar Dimensions in JavaScript

Determining the dimensions of scrollbars in a browser is essential for creating dynamic web pages. This article explores a method to determine the height of horizontal scrollbars and the width of vertical ones using JavaScript.

Solution:

The code snippet provided below calculates the width of a vertical scrollbar using a clever technique.

function getScrollBarWidth() {
  // Create elements to measure scrollbar size
  var inner = document.createElement('p');
  inner.style.width = "100%";
  inner.style.height = "200px";

  var outer = document.createElement('div');
  outer.style.position = "absolute";
  outer.style.top = "0px";
  outer.style.left = "0px";
  outer.style.visibility = "hidden";
  outer.style.width = "200px";
  outer.style.height = "150px";
  outer.style.overflow = "hidden";
  outer.appendChild(inner);

  // Add elements to the DOM
  document.body.appendChild(outer);

  // Calculate scrollbar width
  var w1 = inner.offsetWidth;
  outer.style.overflow = 'scroll';
  var w2 = inner.offsetWidth;
  if (w1 == w2) w2 = outer.clientWidth;

  // Remove elements from the DOM
  document.body.removeChild(outer);

  // Return scrollbar width
  return (w1 - w2);
}

Explanation:

This function creates two elements, an inner element (inner) and an outer element (outer). The inner element has a fixed size while the outer element does not have its overflow property set. The width difference between these elements after enabling overflow on the outer element represents the width of the vertical scrollbar.

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