Getting an element's inner height

Question

How do you get an element\'s inner height, without padding and borders?

No jQuery, just pure JS, and a cross-browser solution (IE7 included)

Answer 1

EDIT from comments:

http://jsfiddle.net/hTGCE/1/ (a bit more code then expected)

in the internet you find functions like this:

  function getRectangle(obj) {

          var r = { top: 0, left: 0, width: 0, height: 0 };

          if(!obj)
             return r;

          else if(typeof obj == "string")
             obj = document.getElementById(obj);


          if(typeof obj != "object")
             return r;

          if(typeof obj.offsetTop != "undefined") {

             r.height = parseInt(obj.offsetHeight);
             r.width  = parseInt(obj.offsetWidth);
             r.left = r.top = 0;

             while(obj && obj.tagName != "BODY") {

                r.top  += parseInt(obj.offsetTop);
                r.left += parseInt(obj.offsetLeft);

                obj = obj.offsetParent;
             }
          }
          return r;
       }

if you want to subtract the padding / border-width is set in the css-file and not dynamic in the style attribute:

    var elem = document.getElementById(id);
    var borderWidth = 0;

          try {
             borderWidth = getComputedStyle(elem).getPropertyValue('border-top-width');

             } catch(e) {

             borderWidth = elem.currentStyle.borderWidth;
          } 
    borderWidth = parseInt(borderWidth.replace("px", ""), 10);

and with the padding the same. then you calculate it.