title: How to load JSON Data on google visualization Chart?
body: <p>I'm new with google-visualization. I'm developing a full dashboard like <a href="https://code.google.com/apis/ajax/playground/?type=visualization#full_dashboard" rel="noreferrer">google full dashboard example</a></p>
  
  <p>Following the example I declare data like this: </p>
  
  <pre><code>var data = google.visualization.arrayToDataTable([
      ['CodiceCliente', 'Cliente', 'QtàO13', 'QtàO14','UM'],
          ['0000038893', 'Coop',300,350, 'CT'] .... ]);
  </code></pre>
  
  <p>Now I want to load data from server. I create a Json like this:</p>
  
  <pre><code>{
  "cols": [
      {"id": "codiceCliente","label": "Cod. Cliente","type": "string"},
      {"id": "clienteDesc","label": "Cliente","type": "string"},
      {"id": "qtaO13","label": "Qtà O13","type": "number"},
      {"id": "qtaO14","label": "Qtà O14","type": "number"},
      {"id": "um","label": "UM","type": "string"}
         ],
  "rows": [
      {
          "c": [
              {"v": "0000038893"},
              {"v": "Coop"},
              {"v": "300"},
              {"v": "350"},
              {"v": "CT"} ]
          }, 
          {.... }, ... ]}
  </code></pre>
  
  <p>In html page i use this code to get data from server:</p>
  
  <pre><code> var jsonData = $.ajax({
        url: "getJson.do",
        dataType:"json",
        async: false
        }).responseText;
    var data = google.visualization.DataTable(jsonData);
  </code></pre>
  
  <p>When I open the page, I get this error: " Object # has no method 'zg' at format+it,default+it,ui+it,controls+it,corechart+it.I.js:183 " </p>
  
  <p>where am I wrong? JSON format is wrong?</p>