Get a div's Width & Height after adding childs to it - html

Question

After creating a Div 'MyParent' , and many childs with different widths&heights are added to this 'MyParent' . By the end, i want to know the final width & height of 'MyParent' in pixels. I've used the familiar functions to get a width & height , i got 0 in all attempts.
Here's a simple code :
var myPrt = document.createElement('div');
var C1 = document.createElement('div');
var C2 = document.createElement('div');
var C3 = document.createElement('div');
myPrt.appendChild(C1);
myPrt.appendChild(C2);
myPrt.appendChild(C3);
$(C1).css({position:absolute;left:-100px;top:100px;width:100px;height:50px;background:red});
$(C2).css({position:absolute;left:100px;top:-100px;width:75px;height:50px;background:yellow});
$(C3).css({position:absolute;left:150px;top:200px;width:90px;height:50px;background:black});
$(myPrt).height(); // returns 0
$(myPrt).css('height') // returns 0
$(myPrt).innerHeight(); // returns 0
$(myPrt).outerHeight(); // returns 0
myPrt.clientHeight; // returns 0
In simple way to get that ?
Because actually I've found a solution to this problem , but it acts in the Childs, create a loop that goes throw all the Parents Childs , then get the max left and min left of these childs , then it returns the distance between the min & max , and the same tip for the Height by getting the max/min top, however ,this tip needs childs to have an absolute position to get there left/top am looking for an existing jquery or javascript function that does that without absolute position for childs .
Thanks

Answer 1

Take a look at this JSFiddle, you're just being clumsy I think. You never added the myPrt div to the document for one.
The other issue is that you're not passing the css as a properly formatted javascript dictionary with string variables.
http://jsfiddle.net/FcSEG/1/
var myPrt = document.createElement('div');
$('body').append(myPrt);
var C1 = document.createElement('div');
var C2 = document.createElement('div');
var C3 = document.createElement('div');
myPrt.appendChild(C1);
myPrt.appendChild(C2);
myPrt.appendChild(C3);
$(C1).css('width','500');
$(C1).css('height','500')
$(C1).css('background','red');
alert($(myPrt).height());