jquery - .animate() query not working -


i wanted implement "scroll top" button in static html site, i've done million times before. added code: (first part making button appear after time, don't worry that)

$( document ).ready(function() {      $(window).scroll(function() {         var scroll = $(document).scrolltop();         var wheight = $(window).height();         var hheight = wheight / 2;         if(scroll >= hheight) {             $('#scroller').css({'opacity': '1'});         } else if (scroll <= hheight) {             $('#scroller').css({'opacity': '0'});         }     });      $('#scroller').click(function() {         alert("click works!");         $('html, body').animate({ scrolltop: 0 }, 500);     }); });

the appearing , disappearing of button works , alerts "click works" if click button. scrolling won't work. lost. read somewhere shouldn't use height: 100% in css , use

height: auto; min-height: 100%;

instead. won't change thing. i've tried use document element scroll.

i glad if can me!

it seems code works:

$( document ).ready(function() {        $(window).scroll(function() {          var scroll = $(document).scrolltop();          var wheight = $(window).height();          var hheight = wheight / 2;          if(scroll >= hheight) {              $('#scroller').css({'opacity': '1'});          } else if (scroll <= hheight) {              $('#scroller').css({'opacity': '0'});          }      });        $('.scroll').click(function() {          $('html, body').animate({ scrolltop: 0 }, 500);      });  });
* {    box-sizing: border-box;  }  html, body {    margin: 0;  }    body {    background: linear-gradient(to top, red, blue);    height: 2000px;    border: 10px solid goldenrod;    position: relative;  }    .scroll {    font-size: 2em;    position: absolute;    bottom: 0;    display: block;    width: 100%;      }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <button class="scroll">scroll</button>


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