title: Export Google Chart to PDF using Cloudformatter, generates blank PDF
body: <p>I'm trying to export google chart to the PDF file. I'm using <em>xepOnline.jqPlugin.js</em> plugin for it from <em>cloudformatter.com</em>. I followed all the steps from <a href="http://www.cloudformatter.com/CSS2Pdf.APIDoc.Usage" rel="nofollow noreferrer">http://www.cloudformatter.com/CSS2Pdf.APIDoc.Usage</a></p>
  
  <p>But when i try to export, PDF get generates with blank square box.</p>
  
  <p><a href="https://i.stack.imgur.com/dW5Wq.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dW5Wq.png" alt="enter image description here"></a></p>
  
  <p>I'm loading the google chart from jquery ajax call. Can any body tell me what could be the issue ?</p>
  
  <p>Here is a sample code without ajax call -</p>
  
  <pre><code> &lt;button type="button" id="" class="btn btn-success pull-right" style="margin-right: 7px;" onclick="return xepOnline.Formatter.Format('chart_container', {render: 'download', filename: 'Years_Build', mimeType: 'application/pdf'});"&gt;Export&lt;/button&gt;
      &lt;div id="chart_container"&gt;
        &lt;div id="chart_div"&gt;&lt;/div&gt;
      &lt;/div&gt;
  &lt;script type="text/javascript"&gt;
  function drawChart() {
  var data = google.visualization.arrayToDataTable([
            ['Year', 'Sales', 'Expenses', 'Profit'],
            ['2014', 1000, 400, 200],
            ['2015', 1170, 460, 250],
            ['2016', 660, 1120, 300],
            ['2017', 1030, 540, 350]
          ]);
  
          var options = {
            chart: {
              title: 'Company Performance',
              subtitle: 'Sales, Expenses, and Profit: 2014-2017',
            }
          };
  
          var chart = new google.charts.Bar(document.getElementById('chart_div'));
          chart.draw(data, google.charts.Bar.convertOptions(options));
                                                              }
  google.charts.load('current', {'packages': ['bar']});
  google.charts.setOnLoadCallback(drawChart);
  &lt;/script&gt;
  </code></pre>