recursively checks every parent of the element to get the ABSOLUTE offset of the element.
call it like this:
getOff(element).x
getOff(element).y
-
-
Save williammalo/3005883 to your computer and use it in GitHub Desktop.
get offset of element
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| 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 | |
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| function(a,x,y){for(x=y=0;a;a=a.offsetParent)x+=a.offsetLeft,y+=a.offsetTop;return{x:x,y:y}} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| { | |
| "name": "getOff", | |
| "description": "returns the ABSOLUTE offset of an element", | |
| "keywords": [ | |
| "css", | |
| "position", | |
| "offset", | |
| "absolute" | |
| ] | |
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!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> |
@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.
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
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.