JavaScript jQuery Page Auto Reload Timer with enable / disable checkbox

autoreload.js

<script>
  $( document ).ready(function() {
    window.setInterval(function() {
      if($('#autoreload').is(':checked')){
        if(('#autoreload-wrapper .countdown').length && (parseInt($('#autoreload-wrapper .countdown').text()) <= 1)){
          // Reload every 60 seconds without sending POST again:
          window.location.href = window.location.href;
        } else {
          $('#autoreload-wrapper .countdown').text(parseInt($('#autoreload-wrapper .countdown').text()) - 1);
        }
      }
    }, 1000);
  });
</script>
<style>
  #autoreload-wrapper {
    display:block;
    position:fixed;
    bottom:0;
    left:0;
    background-color:#fff;
    border: 1px #EEE solid;
    z-index: 99999;
    padding: 6px;
  }
</style>
<div id="autoreload-wrapper">
  <input type="checkbox" value="1" id="autoreload" checked="checked">
  <label for="autoreload">Autom. neu laden (<span class="countdown">60</span>s)</label>
</div>