Twitter bootstrap change affix offset

Question

I have site where I want \'sub navigation\'. So when you scroll to section, its tool bar will affix below the main toolbar. I have this working, but I can\'t change the top offs

Answer 1

I figured it out. Instead of dynamically updating the offset, I changed the offset value to a function:

$(function () {
    $('.sec-nav').addClass("affix-top").each(function (){
        var $self = $(this);
        var offsetFn = function () {
            var $p = $self.closest('.sec');
            var $$ = $p.prevAll('.sec');
            var h = 0;
            $$.each(function () { h+=$(this).outerHeight();});
            return h;
        }
        $self.affix({offset: {top: offsetFn}});
    });
});

Now when a section changes due to dom manipulation or window re-size, the offset is automaticly changed due to the functions return value changing.