How Can I Determine Browser Scrollbar Dimensions Using JavaScript?

Determining Browser Scrollbar Dimensions

How can we ascertain the size of scrollbars in either horizontal or vertical orientations using JavaScript?

Solution:

A JavaScript solution has been proposed by Alexandre Gomes Blog, as quoted below:

function getScrollBarWidth () {
  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);

  document.body.appendChild (outer);
  var w1 = inner.offsetWidth;
  outer.style.overflow = 'scroll';
  var w2 = inner.offsetWidth;
  if (w1 == w2) w2 = outer.clientWidth;

  document.body.removeChild (outer);

  return (w1 - w2);
}

By creating and comparing the width or height of hidden elements with and without the application of scrollbars, this function precisely determines the width of the horizontal scrollbar or the height of the vertical scrollbar.

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