javascript - Adding an If Statement for smaller browser sizes -


i'm trying add condition script no avail. functionality script adds makes sidebar stay in viewport when page scrolled (floating/following animation). because i've added media queries make sidebar 100% wide when browser resized, need behavior stop @ width, i've tried far isn't working. appreciated.

    var scrollableobject = $("#content-left nav"); var offset = scrollableobject.offset(); var toppadding = 15; var isbigger = false;  if($('body').hasclass('admin-bar')){     toppadding = 35; }         function leftnavcheck(){     if( $('#content-left nav').height() > $(window).height() ){         isbigger = true;     }else{         isbigger = false;     }      if(isbigger == false){         $(window).scroll(function() {             if ($(window).scrolltop() > offset.top) {                 scrollableobject.stop().animate({                     margintop: $(window).scrolltop() - offset.top + toppadding                 });             } else {                 scrollableobject.stop().animate({                     margintop: 0                 });             };         });     } }  $(window).load(function() {     leftnavcheck();  }); $(window).resize(function () {      leftnavcheck(); });

i tried adding frankly don't know i'm doing here.

        var iswider = false;     if( $('#content-left nav').width() < 900) {         iswider = false;     }else{         iswider = true;     }


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