myElement.getCoordinates(relative).left;

relative is myElement's container, then use left. Should work or at a
close enough approximation.

http://mootools.net/docs/Element/Element.Dimensions#Element:getCoordinates

On Nov 18, 8:34 am, ksamdev <[EMAIL PROTECTED]> wrote:
> Hi,
>
> consider CSS template (separate from HTML file) with:
>
> .box {
>   ...
>   margin-left: auto;
>   margin-right: auto;
>   ...
>
> }
>
> Now I want to wrap this box inside another one that is created by
> JavaScript but to preserve margin adjustment. So, I'd do something
> like:
>
> <span id='box_to_wrap' class='box'>
> Hello World!
> </span>
> ...
> <script type='text/javascript'>
> window.addEvent( 'domready', function() {
>   var _el = $( 'box_to_wrap');
>   var _wrapper = new Element( 'div');
>
>   // I SKIP HERE _wrapper SETUP TO BE BLOCK, OF THE SAME WIDTH AND
> HEIGHT AS _el. CONSIDER THAT IS DONE
>
>   _wrapper.inject( _el, 'after');
>   _wrapper.adopt( _el);
>
>   // NOW I WANT TO SET WRAPPERS MARGIN-LEFT AND RIGHT TO WHATEVER IS
> SET IN ELEMENT STYLE
>   _wrapper.setStyles( _el.getStyles( 'margin-left', 'margin-right'));});
>
> </script>
>
> Unfortunately the line where styles are set for wrapper won't work
> because:
>
> _el.getStyles( 'margin-left', 'margin-right');
>
> returns 0 margins or specific numbers that Browser has defined on
> first render of page but not 'auto'.
>
> Interesting moment is that if I explicitly specify margin-left and
> margin-right to have auto values in style of 'box_to_wrap' element
> within HTML opening tag everything works fine.
>
> Question: is there any way to get 'auto' value in case CSS for class
> is defined in external template file and not explicitly via
> style='...' ?

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