You can't, obj.setProperty('selected', 'true'); will just set the value
to true.
Best you can do is to set _selected to true then with regex you can
change _selected to selected,
I wrote this awhile back:
http://jsfiddle.net/hazlema/BwczU/
Ran into the same issue. Thats how I delt with it.
On 4/23/2012 12:16 AM, Steve Onnis wrote:
How can i get mootools to actually write the "selected" property into
the HTML when creating new <option> elements?
It seems to select the option fine but it doesn't actually write the
property to the html
Steve