Google Chart Pie Chart

HTML

<script src="http://www.google.com/jsapi?fake=.js"></script>
<div id="chart_div" style="width: 900px; height: 500px;"></div>

JavaScript

google.load("visualization", "1", {packages:["corechart"]});
      
      document.addEventListener("DOMContentLoaded", drawPieChart);
      
      function drawPieChart(){
        var data =[
            ['Task', 'Hours per Day'],
            ['Work',     11],
            ['Eat',      2],
            ['Commute',  2],
            ['Watch TV', 2],
            ['Sleep',    7]
          ];

        drawChart(data);
      }
      
      
      
      
      function drawChart(data) {
        data = google.visualization.arrayToDataTable(data);

        var options = {
          title: 'My Daily Activities'
        };

        var chart = new google.visualization.PieChart(document.getElementById('chart_div'));
        chart.draw(data, options);
      }