Javascript make sidebar “scroll” with the page until its bottom edge hits footer

问题

Javascript make sidebar "scroll" with the page until its bottom edge hits footer. The point is that I have this sidebar that should scroll along with the page and stop when its bottom edge hits the top edge of footer - after that point it should behave by default(be static again), which can be seen here: http://zakuvavanje.rs/ . This question is similar to this one jQuery scrolling DIV: stop scrolling when DIV reaches footer , I didn't want to ask the question, however I had no idea how to make it happen, the script should go where I put

console.log('now the script should start');

P.S. the problem is for smaller screens so please set viewport to 1366x768 or less to see the issue. Here's the pastebin for my script: http://pastebin.com/8anjKR1d , and here's the same script here:

//"fixed" sidebar
function scrollingAside() {

    var $aside     = $('.aside'),
        asideH     = $aside.outerHeight(),
        asideTop   = $aside.offset().top,
        docH       = $(document).height(),
        asideOfsB  = docH - asideTop - asideH,
        footerH    = $('.footer').outerHeight(),
        wScrollTop = $(window).scrollTop(),
        wHeight    = $(window).height(),
        scrollBtm  = docH - wScrollTop - wHeight;


    function stopAsideScroll() {

        if ( asideOfsB < footerH + 2 ) {


            console.log('now the script should start');


        } //end if

    } //stopAsideScroll


    //if screen is wide enough so that the sidebar is there
    if( $(window).width() > 840 ) {


        if( wScrollTop > 376 ) {
            $aside.css({ 'transform' : 'translateY('+ (wScrollTop - 376) +'px)' });

            //stop scrolling if it reaches footer
            stopAsideScroll();
        } else {
            $aside.css({ 'transform' : 'translateY(0)' });
        }


        //if screen is smaller disable
    } else {
        $aside.css({ 'transform' : 'translateY(0)' });
    }


} //scr aside

Thanks in advance for whoever fixes this for me!!! :)

来源：https://stackoverflow.com/questions/39436074/javascript-make-sidebar-scroll-with-the-page-until-its-bottom-edge-hits-footer