javascript - Jquery Scrolling and Previous and Next Div Buttons -

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so i'm trying have previous , next buttons on top of div, , when click on them takes me next , previous div it's supposed to.

here's code:

$('button.navbutton').on('click', function(e) {        if ($(this).hasclass('next') && $('.selected').next('div.day').length > 0 ) {           var $next = $('.selected').next('.day');           var top = $next.offset().top;            $('.selected').removeclass('selected');            $('body').animate({             scrolltop: top                }, function () {                  $next.addclass('selected');           });       } else if ($(this).hasclass('prev') && $('.selected').prev('div.day').length > 0 ) {           var $prev = $('.selected').prev('.day');           var top = $prev.offset().top;            $('.selected').removeclass('selected');            $('body').animate({             scrolltop: top                }, function () {                  $prev.addclass('selected');           });       }     });

it works, except if reach div scrolling , not buttons, doesn't. know because div not on view still has "selected" class, tried function:

$('div.day').each(function(){         if($(this).offset().top < winheight/2 && !$(this).hasclass('selected') ){             $('.selected').removeclass('selected');             $(this).addclass('selected');           }       }

this not not work makes previous code not work either.

i'm new javascript can't figure out why makes other code stop working, , how can make div being viewed "selected" one? (kinda 9gag j k shortcuts).

thanks lot , sorry using time.


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