Determine if every radio group has had an option selected

Question

I need to make sure that all the radio groups have been answered before I enable the submit button. If I have:

var radioBtns = $(\'input\').filter(\':radio\         


        

Answer 1

This works:

var all_answered = true;
$(':radio').each(function(){
    if($(':radio[name='+$(this).attr('name')+']:checked').length == 0)
    {
        all_answered = false;
    }
});
alert(all_answered);

Working demo: http://jsfiddle.net/AlienWebguy/8Cu6d/1/