Safari Ajax bug? checked radio not checked - ajax

Question

In Safari, If I load a piece of html via XHR (ajax) the browser does not render the radio button that has the checked="checked" attribute as checked.
the html I fetch via ajax:
<input type="radio" name="radiotest" value="off">
<input type="radio" name="radiotest" value="on" checked="checked">
the browser renders two unchecked radio buttons. If I load the exact same code directly from a plain html file (no ajax) the radio buttons render as they should, the last being in its checked state.
what's wrong, is this a known bug? Is there a fix available?
EDIT:
Probing further this looks like a browser bug, and I could not so far fix it with jQuery Post processing, any help appreciated.. here is what I've found:
I have a page that pulls in some form element via ajax.
The html is this:
<input type="checkbox" name="checktest">
<input type="checkbox" name="checktest" checked="checked">
<input type="radio" name="radiotest" value="off">
<input type="radio" name="radiotest" value="on" checked="checked">
after the form element are pulled in, the checkboxed render correct, but the radios both render unckecked. Now, If i run the following jQuery command (from the Safari 5 console):
$('#activemodules input[checked="checked"]');
..it returns an object containing the one checked checkbox.
but if I run the command:
$('#activemodules input[value="on"]');
it actually retuns the correct object, and it even shows its outerHTML property correct like this:
outerHTML: "<input type="radio" name="radiotest" value="on" checked="checked">"
now, if I do:
$('#activemodules input[value="on"]').attr('checked','checked');
Safari get's it, and renders it correctly. I guess I'll just have to pass a data-ischecked="true" attribute and use that to catch and 're-check' all radio buttons after the ajax bit is loaded.. but still, even if I can do this, I'd like to hear any comment or suggestions on this.

Answer 1

This is what my solutions ended like:
First I add a data-ischecked="1" attribute to the radios that are checked:
<input type="radio" name="foo" data-ischecked="1" value="bar" checked="checked">
then, after the ajax call succeeds and finishes I run this:
$('#myradios :radio')
.each(function(){
if( $(this).data('ischecked') ){
$(this).attr('checked','checked');
$(this).removeAttr('data-ischecked');
}
});
This seems to work fine.. but I found out some other stuff of importance:
If I called the data attribute simply data-checked instead of data-ischecked it DID NOT WORK, maybe this is a reserved name?
And also; if I ran the operation on the broader selector scope:
$(':radio')
.each ...
then it also DID NOT WORK
I don't know why, but adding the id of a parent element of the radios that was also part of the html returned by the ajax call to the selecor scope like this:
$('#myradios :radio')
made it work..

Answer 2

I found that mikkelbreum's solution only worked if I did not include the "checked" attribute in the AJAX-injected code.
<input type="radio" name="foo" data-ischecked="1" value="bar">