javascript - Get div to show/hide when scrolling for a "back to top" link -


i can't make "go top" id=arrow-up div disappear when on e.g. top of page.

at top of page got

so arrow-up div visible(show("slow")) when not on top of page.

 var tmp = $(window).height();

tmp used viewport height... not sure if right?

i have seen other solutions kind of same... , can't make them work, font use :in-viewport. can make viewport or side tracked?

<script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js">        </script> <script src="bootstrap-3.1.1-dist/js/bootstrap.min.js"></script> <script src="http://malsup.github.com/jquery.form.js"></script> <script src="/jquery/isinviewport.min.js"></script>    $(window).scroll(function() {   if($('#pagestart:in-viewport(tmp)')){     $("#arrow-up").hide("slow");   }else{     $("#arrow-up").show("slow");   } });

"so arrow-up div visible(show("slow")) when not on top of page"

i way:

http://jsfiddle.net/wf_4/gubec/

script:

// fade in #back-top $(function () {     $(window).scroll(function () {         if ($(this).scrolltop() > 300) {             $('.back-top').fadein();         } else {             $('.back-top').fadeout();         }     });      // scroll body 0px on click     $('.back-top').click(function () {         $('body,html').animate({             scrolltop: 0         }, 1600);         return false;     }); });

css

.back-top {     width:25px;     height:25px;     background:#ff0000;     position:fixed;     bottom:68px;     right:5px;     display:none;     opacity:0.8; }

html

<div class="back-top" title="top of page"></div>

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