.offset() called on a hidden element is positioned relative to it's old position instead of document.

[schinken@…]

var $thumbThingy = $('<div id="basket-thumbview"></div>').appendTo( $('body') );

$thumbThingy.css('display', 'none' );

setInterval( function() {

$thumbThingy.offset( { left: 10, top: 10 } ); console.log( $thumbThingy.css('left'), $thumbThingy.css('top') );

}, 1000 );

Results in:

10px -362px 15820px -724px 15830px -1086px 15840px -1448px 15850px -1810px 15860px -2172px 15870px -2534px 15880px -2896px 15890px -3258px 158100px -3620px 158110px -3982px

[anonymous]

damn. not formatted correctly :(

[sindresorhus]

Thanks for taking the time to contribute to the jQuery project! Please provide a complete reduced test case on jsFiddle to help us assess your ticket.

Additionally, be sure to test against the jQuery Edge version to ensure the issue still exists. To get you started, use this boilerplate:  http://jsfiddle.net/FrKyN/ Open the link and click to "Fork" (in the top menu) to get started.

[schinken@…]

the bug seems to happen if display is none.

The line "curOffset = curElem.offset()" in jQuery.offset.setOffset returns everytime top,left = 0

So this calculation:

( options.top - curOffset.top ) + curTop;

is like:

( 10 - 0 ) + 10

And result in a growing value

Traced it down to getOffset, but not sure what this causes the problem inside that function

[sindresorhus]

We're still going to need a jsfiddle to confirm and test ourselves.

[schinken@…]

Oh sorry,

here it is:

 http://jsfiddle.net/eyEaG/

and as the counter-part, with display: block, it works:

 http://jsfiddle.net/dDenH/1/

[sindresorhus]

A better description of this issue would be:

If .offset() is called on a hidden element, it will be positioned relative to it's old position instead of the document.

Improved testcase:  http://jsfiddle.net/mofle/KYdt7/

[dmethvin]

Note: jQuery does not support getting the offset coordinates of hidden elements or accounting for borders, margins, or padding set on the body element. --  http://api.jquery.com/offset/