javascript - JS (CSS) dynamic background image moving -


i made little script makes photo background scroll up/button in same time page scrolling. problem background image scrolling after page scrolling (it have delay).

question: how may make move background image page scrolling in example http://shapebootstrap.net/item/1524936-unika-responsive-one-page-html5-template/live-demo ?

i made plnkr code: https://plnkr.co/edit/e6ocuf4sxsa80pi6xanj?p=preview

var bgscroll = function(lastscrolltop, elem) {    lastscrolltop = $(window).scrolltop();    $(elem).css('transition', 'all .5s');    $(elem).css('background-position', '0% ' + parseint(-lastscrolltop / 2) + 'px');    console.log('lastscrolltop = ' + lastscrolltop);  };  $(window).load(function() {    var lastst = 0;    var homeelem = '#add-outer-container';    $(window).on("scroll", function() {      bgscroll(lastst, homeelem);    });  });
html,  body {    height: 100%;    margin: 0;    padding: 0;    background-color: gray;  }  #add-outer-container {    width: 100%;    height: 500px;    background: #fff url(http://www.gettyimages.pt/gi-resources/images/homepage/hero/pt/pt_hero_42_153645159.jpg) no-repeat fixed 0% 0%;    overflow: hidden;    color: white;    border: 1px solid red;  }
<!doctype html>  <html lang="en">    <head>    <!-- version 0.6.1.0 -->    <title>test</title>    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.0/jquery.min.js"></script>    <script src="app.js"></script>    <link rel="stylesheet" type="text/css" href="app.css"></link>  </head>    <body>    <div id="add-outer-container"></div>    <div style="height: 1500px; color: green;"></div>  </body>    </html>

what looking called parallax effect. there several libraries can (http://pixelcog.github.io/parallax.js/ instance). simplest solution this:

// handle window scroll event  $(window).scroll(function () {      // store distance scrolled      var scrolled = $(window).scrolltop() + 1;        // set scroll speed      var scrollspeed = 0.3;            // update background position      $("#add-outer-container").css('background-position', '0' + -(scrolled * scrollspeed) + 'px');  });
body {      min-height:3000px;  }    #add-outer-container {      background:url(http://www.gettyimages.pt/gi-resources/images/homepage/hero/pt/pt_hero_42_153645159.jpg) no-repeat  fixed;      width:100%;      height:500px;      margin:0 auto;      border: 1px solid red;  }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <div id="add-outer-container"></div>


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