recursively checks every parent of the element to get the ABSOLUTE offset of the element.
call it like this:
getOff(element);
getOff(element);
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get offset of element
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| function(a,x,y){ | |
| for(x=y=0;a;a=a.offsetParent) //Loop through element and all it's parents | |
| x+=a.offsetLeft, //add offset of current element to variables x and y | |
| y+=a.offsetTop; | |
| return{x:x,y:y} //return object of x and y | |
| } |
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| function(a,x,y){for(x=y=0;a;a=a.offsetParent)x+=a.offsetLeft,y+=a.offsetTop;return{x:x,y:y}} |
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| DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
| Version 2, December 2004 | |
| Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE> | |
| Everyone is permitted to copy and distribute verbatim or modified | |
| copies of this license document, and changing it is allowed as long | |
| as the name is changed. | |
| DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
| TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION | |
| 0. You just DO WHAT THE FUCK YOU WANT TO. |
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| { | |
| "name": "getOff", | |
| "description": "returns the ABSOLUTE offset of an element", | |
| "keywords": [ | |
| "css", | |
| "position", | |
| "offset", | |
| "absolute" | |
| ] | |
| } |
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| <!doctype html> | |
| <style> | |
| #foo{position:relative;top:100px;margin:40px} | |
| </style> | |
| <div id=foo></div> | |
| <script> | |
| getOff = function(a,x,y){for(x=y=0;a;a=a.offsetParent)x+=a.offsetLeft,y+=a.offsetTop;return{x:x,y:y}}; | |
| document.write( | |
| getOff(document.getElementById("foo")).y | |
| ); | |
| </script> |
Author
@atk
:D I made it one function that returns an object. Thanks for the Idea!
I originally did this as part of a "smooth scrolling to hashlink" script.
... I could make it a prototype and the function would be hidden in a getter, so you could do:
document.getElementById("foo").x
document.getElementById("foo").y
it would be a much simpler syntax but the code would be longer...
This reminds me too much of the ambigious old actionscript syntax... I'll rather take the object, thanks.
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Why not both in one function?
function(a,x,y){for(x=y=0;a;a=a.offsetParent)x+=(a.offsetLeft||0),y+=(a.offsetTop||0);return{left:x,top:y}}Anyway, the offset method is not very precise in some browsers (especially in Quirks mode). A better way to go (if available) is to use getBoundingClientRect, though this results in relative positions to the visible browser window.