javascript - Change a value over a set amount of time with jQuery? -


i'm working on project calls circular progress bar. found 1 trick here:

http://codepen.io/shankarcabus/pen/gzafb

but need animate on page load go in value each time:

<div class="progress-pie-chart" data-percent="43">

so on "page1.htm", need data-percent value automatically increase incrementally 0-20. on "page2.htm" 20-33, etc. i'm pretty new jquery, have no idea begin on that.

how create function increase data-percent value on say, 500 milliseconds?

using setinterval can produce like. use math calculate steps based on fps create smooth animation. decimals can used percent 

var start = 0;  var end = 30;  var time = 800; //in ms  var fps = 30;    var increment = ((end-start)/time)*fps;    $('.progress-pie-chart')[0].dataset.percent = start;    var timer = setinterval(function() {    $('.progress-pie-chart')[0].dataset.percent = parsefloat($('.progress-pie-chart')[0].dataset.percent) + increment;      if (parsefloat($('.progress-pie-chart')[0].dataset.percent) >= end) {      clearinterval(timer);    }      var $ppc = $('.progress-pie-chart'),      percent = parsefloat($ppc[0].dataset.percent),      deg = 360 * percent / 100;      if (percent > 50) {      $ppc.addclass('gt-50');    }    $('.ppc-progress-fill').css('transform', 'rotate(' + deg + 'deg)');    $('.ppc-percents span').html(parseint(percent, 10) + '%');  }, fps);
.progress-pie-chart {    width: 200px;    height: 200px;    border-radius: 50%;    background-color: #e5e5e5;    position: relative;  }  .progress-pie-chart.gt-50 {    background-color: #81ce97;  }  .ppc-progress {    content: "";    position: absolute;    border-radius: 50%;    left: calc(50% - 100px);    top: calc(50% - 100px);    width: 200px;    height: 200px;    clip: rect(0, 200px, 200px, 100px);  }  .ppc-progress .ppc-progress-fill {    content: "";    position: absolute;    border-radius: 50%;    left: calc(50% - 100px);    top: calc(50% - 100px);    width: 200px;    height: 200px;    clip: rect(0, 100px, 200px, 0);    background: #81ce97;    transform: rotate(60deg);  }  .gt-50 .ppc-progress {    clip: rect(0, 100px, 200px, 0);  }  .gt-50 .ppc-progress .ppc-progress-fill {    clip: rect(0, 200px, 200px, 100px);    background: #e5e5e5;  }  .ppc-percents {    content: "";    position: absolute;    border-radius: 50%;    left: calc(50% - 173.91304px/2);    top: calc(50% - 173.91304px/2);    width: 173.91304px;    height: 173.91304px;    background: #fff;    text-align: center;    display: table;  }  .ppc-percents span {    display: block;    font-size: 2.6em;    font-weight: bold;    color: #81ce97;  }  .pcc-percents-wrapper {    display: table-cell;    vertical-align: middle;  }  body {    font-family: arial;    background: #f7f7f7;  }  .progress-pie-chart {    margin: 50px auto 0;  }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>    <div class="progress-pie-chart" data-percent="0">    <div class="ppc-progress">      <div class="ppc-progress-fill"></div>    </div>    <div class="ppc-percents">      <div class="pcc-percents-wrapper">        <span>%</span>      </div>    </div>  </div>


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