Matthew Matthew - 1 year ago 95
HTML Question

Getting offsetTop of element in a table

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?

Answer Source

offsetTop returns a value relative to offsetParent; you need to recursively add offsetParent.offsetTop through all of the parents until offsetParent is null. Consider using jQuery's offset() method.

EDIT: 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 };
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