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>


Comments

Post a Comment

Popular posts from this blog

Is there a better way to structure post methods in Class Based Views -

i'm using class based views in django , never specify url in ajax calls , omit action parameter in form because know these requests go through post method of class based view. notice view - profile page make many requests depending on user updating on page - post method become convoluted , if/else mess example: def post(self, request, *args, **kwargs): # handle user changing available date if request.post.get('availabledate') != none: self.updateavailabledate(request) return jsonresponse({'result':'success'}) if request.post.get('newprojectname') != none: creative_user = creativeuserprofile.objects.get(id = request.user.id) project = project.create_project(creative_user, request.post['newprojectname']) project.save() return jsonresponse({'projectid': project.id }) if request.post.get('projectimage') != none , request.files['file']: proj
Read more

performance - Why is XCHG reg, reg a 3 micro-op instruction on modern Intel architectures? -

i'm doing micro-optimization on performance critical part of code , came across sequence of instructions (in at&t syntax): add %rax, %rbx mov %rdx, %rax mov %rbx, %rdx i thought had use case xchg allow me shave instruction , write: add %rbx, %rax xchg %rax, %rdx however, dimay found agner fog's instruction tables , xchg 3 micro-op instruction 2 cycle latency on sandy bridge, ivy bridge, broadwell, haswell , skylake. 3 whole micro-ops , 2 cycles of latency! 3 micro-ops throws off 4-1-1-1 cadence , 2 cycle latency makes worse original in best case since last 2 instructions in original might execute in parallel. now... cpu might breaking instruction micro-ops equivalent to: mov %rax, %tmp mov %rdx, %rax mov %tmp, %rdx where tmp anonymous internal register , suppose last 2 micro-ops run in parallel latency 2 cycles. given register renaming occurs on these micro-architectures, though, doesn't make sense me done way. why wouldn't register renamer
Read more

jquery - Responsive Navbar with Sub Navbar -

good day, forgive me nav vocabulary not best. if question confusing apologize. i'm working on navigation bar needs centered on page @ 768px , above. items in nav open (or perhaps toggle) subnav lives directly below. these nav should appear centered on page. i have been able work through responsive portion of nav bar, having main items align vertically , sub nav menu of each item roll out below, , gave them indent separation. working well. however, issue not responsive side, behavior @ width greater 768px. happens toggling menu's sub navigation pushes other main items down page below sub nav. here's code: $(document).ready(function () { //stick in fixed 100% height behind navbar don't wrap $('#slide-nav.navbar-inverse').after($('<div class="inverse" id="navbar-height-col"></div>')); $('#slide-nav.navbar-default').after($('<div id="navbar-height-col"></d
Read more