Get the Height of the DIV in javascript

This will set the height of your div to the height of the browser window:
NOTE: 'divID' is the id name of the div in the html document.

window.onload = setDiv;

function setDiv() {
  var wh = getWindowHeight(); // Window Height
  var d = document.getElementById('divID') // Get div element
   var dh = d.offsetHeight // div height
  d.style.height = wh + 'px'; // Set div height to window height
 }




function getWindowHeight() {
  var windowHeight = 0;
	
  if (typeof(window.innerHeight) == 'number')
    windowHeight = window.innerHeight;
	
  else {
		
    if (document.documentElement && document.documentElement.clientHeight)
       windowHeight = document.documentElement.clientHeight;
		
    else {
      if (document.body && document.body.clientHeight)
        windowHeight = document.body.clientHeight; }; };
				
  return windowHeight;
 };