javascript - Show button if root/parent element scroll up/down and hide that button if not -


how show button if root or parent element need scrolled , hide button if root/parent element not need scrolled ?.

for details:

  • if have element max-height 200px (example) , overflow-y:auto, element can scrolled if childrens exceeds or greater max-height above, , can't scrolled if not.

now, how show/hide button (example) according root or parent element scroll.

here code :

var contentstatusprofile = $(".main_profile"); var scrollingstatus = $(".scroll-down-status-profile"); if ( ???? ) { /* here qestion showing , hiding button corresponding parent element need scrolled or not */     scrollingstatus.on('click',function(){         if ($(this).hasclass('more-up-status-profile')) {             var lengthscroll = contentstatusprofile[0].scrolltop;             lengthscroll -= 150;             contentstatusprofile.animate({                 scrolltop:lengthscroll             }, 500);         }         else {             var lengthscroll = contentstatusprofile[0].scrolltop;             lengthscroll += 150;             contentstatusprofile.animate({                 scrolltop:lengthscroll             }, 500);             if(lengthscroll >= contentstatusprofile[0].scrollheight - contentstatusprofile.height()){                 scrollingstatus.addclass('more-up-status-profile').children().addclass('glyphicon-chevron-up').removeclass('glyphicon-chevron-down');             }         }     }); }

any answer appreciated. thank.

you have compare 2 different hieghts of .main_profile.

the jquery .outerheight() include padding.
, javascript .scrollheight.

you noticed first has () , not second...
because first jquery method , second javascript element property.

so 2 ones compare know if there content scrolled.

i got click event handler out of if/else block.
has defined separately because if/else used show/hide button.

i changed bit way add , remove more-up-status-profile class. made turn red when has class...
don't hesitate put ugly obvious colors when debugging! ;)

var contentstatusprofile = $(".main_profile");  var scrollingstatus = $(".scroll-down-status-profile");    var csp_height = contentstatusprofile.outerheight();  var csp_scrollableheight = contentstatusprofile[0].scrollheight;    console.log( csp_height );  console.log( csp_scrollableheight );  console.log( csp_scrollableheight > csp_height );    if ( csp_scrollableheight > csp_height ) { /* here qestion showing , hiding button corresponding parent element need scrolled or not */    $(".scroll-down-status-profile").show();  }else{    $(".scroll-down-status-profile").hide();  }    scrollingstatus.on('click',function(){    var lengthscroll = contentstatusprofile[0].scrolltop;      if ($(this).hasclass('more-up-status-profile')) {        lengthscroll -= 150;      contentstatusprofile.animate({        scrolltop:lengthscroll      }, 500);            if(lengthscroll <= 0){        scrollingstatus.removeclass('more-up-status-profile').children().addclass('glyphicon-chevron-down').removeclass('glyphicon-chevron-up');      }    }    else {        lengthscroll += 150;      contentstatusprofile.animate({        scrolltop:lengthscroll      }, 500);        if(lengthscroll >= contentstatusprofile[0].scrollheight - contentstatusprofile.outerheight()){        scrollingstatus.addclass('more-up-status-profile').children().addclass('glyphicon-chevron-up').removeclass('glyphicon-chevron-down');      }else{        scrollingstatus.removeclass('more-up-status-profile').children().addclass('glyphicon-chevron-down').removeclass('glyphicon-chevron-up');      }    }  });
.main_profile{    height: 200px;    border: 1px solid black;    overflow-y: auto;  }    .more-up-status-profile{    background-color: red;  }
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>  <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>  <link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>    <div class="main_profile" style="max-height:100px; padding:20px">    <div id="test">      <ul>        <li>lorem ipsum</li>        <li>lorem ipsum</li>        <li>lorem ipsum</li>        <li>lorem ipsum</li>        <li>lorem ipsum</li>        <li>lorem ipsum</li>        <li>lorem ipsum</li>        <li>lorem ipsum</li>        <li>lorem ipsum</li>        <li>lorem ipsum</li>        <li>lorem ipsum</li>        <li>lorem ipsum</li>        <li>lorem ipsum</li>        <li>lorem ipsum</li>        <li>lorem ipsum</li>        <li>lorem ipsum</li>        <li>lorem ipsum</li>        <li>lorem ipsum</li>        <li>lorem ipsum</li>      </ul>    </div>  </div>  <button class="scroll-down-status-profile">scroll <span class="glyphicon glyphicon-chevron-down"></span></button>


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