javascript - How to make a fixed sidebar stop at the end of a container -


i have container 2 columns, 1 of holds sidebar.

jsfiddle

the sidebar fixed, , when gets near bottom used jquery alter bottom have stay @ bottom of container.

how can make stops moving when hits bottom of container (outlined in red)? have work sidebar of height.

html

<div class="container">   <div class="col-left">     <div class="sidebar">       fixed sidebar     </div>   </div>    <div class="col-right">     <p>paragraph</p>     <p>paragraph</p>     <p>paragraph</p>   </div> </div>  <footer>footer</footer>

css

.container {   outline: 1px solid red;   position: relative; }  .col-left {   width: 58%;   display: inline-block;   outline: 1px solid black;   vertical-align: top;   height: 100%; }  .col-right {   width: 40%;   display: inline-block;   outline: 1px solid black;   vertical-align: top; }  .sidebar {   position: fixed;   top: 50px;   left: 50px;   height: 200px;   width: 100px;   background: #fff; }  footer {   background: #000;   width: 100%;   height: 300px;   margin-top: 100px;   color: #fff; }

jquery (doubt it'll of use think needs rethought)

jquery(window).scroll(function(){   var scrollbottom = jquery(document).height() - jquery(this).scrolltop() - jquery(this).height();   console.log(scrollbottom);       if (scrollbottom < 300){          jquery('.sidebar').css('bottom', math.abs(scrollbottom - 420));        jquery('.sidebar').css('top', 'auto');      } else {        jquery('.sidebar').css('bottom', 'auto');        jquery('.sidebar').css('top', '50px');      }

here's jquery solution whipped calculating heights of relevant elements, , factoring in current scroll position of page. when sidebar move outside of container, .lock class added unfixes css.

working example below:

var $sidebar = $('.sidebar');  var $container = $('.container');  var sidebottom = $sidebar.offset().top + $sidebar.height();  var contbottom = $container.offset().top + $container.height();    $(window).scroll(function() {    if (window.scrolly + sidebottom > contbottom) {      $sidebar.addclass('lock');    } else if ($sidebar.hasclass('lock')) {      $sidebar.removeclass('lock');    }  });
body {    background: #eee;    margin: 0;  }    .container {    outline: 1px solid red;    position: relative;  }    .col-left {    width: 58%;    display: inline-block;    outline: 1px solid black;    vertical-align: top;    height: 100%;  }    .col-right {    width: 40%;    display: inline-block;    outline: 1px solid black;    vertical-align: top;  }    .sidebar {    position: fixed;    top: 50px;    left: 50px;    height: 140px;    width: 100px;    background: #fff;  }    .sidebar.lock {    position: absolute;    bottom: 0;    top: auto;  }    footer {    background: #000;    width: 100%;    height: 400px;    margin-top: 100px;    color: #fff;  }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>    <div class="container">    <div class="col-left">      <div class="sidebar">        fixed sidebar      </div>    </div>      <div class="col-right">      <p>paragraph</p>      <p>paragraph</p>      <p>paragraph</p>      <p>paragraph</p>      <p>paragraph</p>      <p>paragraph</p>      <p>paragraph</p>      <p>paragraph</p>      <p>paragraph</p>      <p>paragraph</p>      <p>paragraph</p>    </div>  </div>    <footer>footer</footer>


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