Getting offsetTop of element in a table
-
20-08-2019 - |
Question
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?
Solution
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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