$(document).ready(function() {

  var time = 7; // time in seconds

  var $progressBar,
      $bar, 
      $elem, 
      isPause, 
      tick,
      percentTime;

    //Init the carousel
    $("#owl-demo").owlCarousel({
      slideSpeed : 500,
      paginationSpeed : 500,
      singleItem : true,
      afterInit : progressBar,
      afterMove : moved,
      startDragging : pauseOnDragging
    });

    //Init progressBar where elem is $("#owl-demo")
    function progressBar(elem){
      $elem = elem;
      //build progress bar elements
      buildProgressBar();
      //start counting
      start();
    }

    //create div#progressBar and div#bar then prepend to $("#owl-demo")
    function buildProgressBar(){
      $progressBar = $("<div>",{
        id:"progressBar"
      });
      $bar = $("<div>",{
        id:"bar"
      });
      $progressBar.append($bar).prependTo($elem);
    }

    function start() {
      //reset timer
      percentTime = 0;
      isPause = false;
      //run interval every 0.01 second
      tick = setInterval(interval, 10);
    };

    function interval() {
      if(isPause === false){
        percentTime += 1 / time;
        $bar.css({
           width: percentTime+"%"
         });
        //if percentTime is equal or greater than 100
        if(percentTime >= 100){
          //slide to next item 
          $elem.trigger('owl.next')
        }
      }
    }

    //pause while dragging 
    function pauseOnDragging(){
      isPause = true;
    }

    //moved callback
    function moved(){
      //clear interval
      clearTimeout(tick);
      //start again
      start();
    }

    //uncomment this to make pause on mouseover 
    // $elem.on('mouseover',function(){
    //   isPause = true;
    // })
    // $elem.on('mouseout',function(){
    //   isPause = false;
    // })

});