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Get Object Dimensions

Java Method

java
Element.getBoundingClientRect()

method will return an object containing the width, height, and some other useful values:

java
{
    width: 960,
    height: 71,
    top: 603,
    bottom: 674,
    left: 360,
    right: 1320
}

Get the values separated in variables:

java
var element = document.getElementById('foo');
var positionInfo = element.getBoundingClientRect();
var height = positionInfo.height;
var width = positionInfo.width;

Look at the source for more methods and related discussions.