ElementStacks

HTML

<script src="http://highcharts.com/js/testing.js"></script>
<div id="container" style="height: 400px"></div>

JavaScript

window.chart = new Highcharts.Chart({
    chart: {
        renderTo: 'container'
    },
    series: []
}, function(chart){

   chart.showLoading();
   
   setTimeout(function(){
       chart.addSeries({data: [129.9, 271.5, 306.4, 29.2, 544.0, 376.0, 
                               435.6, 348.5, 216.4, 294.1, 35.6, 354.4]});
       chart.hideLoading();
   }, 2000);
});