{
    "cols": [
    {"id":"","label":"Topping","pattern":"","type":"string"},
    {"id":"","label":"Slices","pattern":"","type":"number"}
      ],
  "rows": [
        {"c":[{"v":"Mushrooms"},{"v":3}]},
        {"c":[{"v":"Onions"},{"v":1}]},
        {"c":[{"v":"Olives"},{"v":1}]},
        {"c":[{"v":"Zucchini"},{"v":1}]},
        {"c":[{"v":"Pepperoni"},{"v":2}]}
      ]
    }

var jsonData = $.ajax({
      url: $('#barchart_values').attr('data-actionurl'),
      dataType: "json",
      async: false
    }).responseText;

var options = {
      title: "Vegetables",
      legend: { position: 'top' },
      colors: ['green', 'red', 'blue']
    };
    var data = new google.visualization.DataTable(jsonData);
    var chart = new google.visualization.BarChart(document.getElementById('barchart_values'));
    chart.draw(data, options);