I can't seem to figure out how to get the offsetTop of an element within a table. It works fine on elements outside tables, but all of the elements within a table return the same result, and it's usually at the top of the page. I tried this in Firefox and Chrome. How do I get the offsetTop of an element in a table?
offsetTop returns a value relative to offsetParent; you need to loop through all of the parents adding offsetParent.offsetTop until offsetParent is null. Consider using jQuery's offset() method.
If you don't want to use jQuery, you can write a method like this (untested):
function offset(elem) {
if(!elem) elem = this;
var x = elem.offsetLeft;
var y = elem.offsetTop;
while (elem = elem.offsetParent) {
x += elem.offsetLeft;
y += elem.offsetTop;
}
return { left: x, top: y };
}