Google Charts - 「this.ug不是函數」

我試圖用this example in their documentation從PHP代碼填充Google Chart。Google Charts - 「this.ug不是函數」

通過精確地遵循格式，我不斷收到JS錯誤：this.ug is not a function。

的仔細格式化無休止地檢查JSON小時之後才發現的格式完美的每一次，我結束了創建一個的jsfiddle是用自己的例子在這裏複製的問題：

什麼我在這裏完成的不是使用AJAX，而是簡單地將sampleData.json文件的內容複製爲DataTable()參數。

google.load("visualization", "1", {packages:["corechart"]}); 
     google.setOnLoadCallback(drawChart); 
     function drawChart() { 
      var data = google.visualization.DataTable({ 
       "cols": [ 
        {"id":"","label":"Topping","pattern":"","type":"string"}, 
        {"id":"","label":"Slices","pattern":"","type":"number"} 
       ], 
       "rows": [ 
        {"c":[{"v":"Mushrooms","f":null},{"v":3,"f":null}]}, 
        {"c":[{"v":"Onions","f":null},{"v":1,"f":null}]}, 
        {"c":[{"v":"Olives","f":null},{"v":1,"f":null}]}, 
        {"c":[{"v":"Zucchini","f":null},{"v":1,"f":null}]}, 
        {"c":[{"v":"Pepperoni","f":null},{"v":2,"f":null}]} 
       ] 
      }); 

      var options = { 
       'width' : 400, 
       'height' : 900 
      }; 

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

在此先感謝您的任何指導。

來源

2014-02-22 Leng