google.charts.load('current', {
  packages:['corechart']
}).then(function () {
  $.ajax({
    url: "",
    dataType: "JSON",
    success: function(result){
      drawChart(result);
    },
    error: function () {
      var result = [
        {name: 'defect 1', defects: '1'},
        {name: 'defect 2', defects: '2'},
        {name: 'defect 3', defects: '3'},
        {name: 'defect 4', defects: '4'},
        {name: 'defect 5', defects: '5'}
      ];

      drawChart(result);
    }
  });

  function drawChart(result) {
    var data = new google.visualization.DataTable();
    data.addColumn('string', 'Name');
    data.addColumn('number', 'defects');

    var dataArray = [];

    $.each(result, function(i, obj) {
      dataArray.push([obj.name, parseInt(obj.defects)]);
    });

    data.addRows(dataArray);

    var piechart_options = {
      title : 'Defects Registered',
      width : 500,
      height: 300,
      is3D: true,
    };
    var piechart = new google.visualization.PieChart(document.getElementById('piechart_div'));
    piechart.draw(data, piechart_options);
  }
});