how can i use variable in Google Chart Javascript -

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below code:

                    <div id="chart_div"></div>                          <script type="text/javascript" src="https://www.google.com/jsapi"></script>                          <script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>                         <script type="text/javascript">                              var data12 = '<%= globalvariable.data99 %>';                               // load visualization api , corechart package.                             google.charts.load('current', { 'packages': ['corechart'] });                              // set callback run when google visualization api loaded.                             google.charts.setonloadcallback(drawchart);                              function drawchart() {                                  // create data table.                                 var data = new google.visualization.datatable();                                 data.addcolumn('string', 'topping');                                 data.addcolumn('number', 'slices');                                 data.addrows([                                 ['completed', 3],                                 ['new', data12],                                 ['waiting', 2]                             ]);                                  // set chart options                                 var options = { 'is3d': true,                                     'width': 480,                                     'height': 200                                 };                                  var chart = new google.visualization.piechart(document.getelementbyid('chart_div'));                                 chart.draw(data, options);                             }                         </script>

i want use data12 variable. chart not displaying variable value. data12 gloabl variable.

i have updated code. please check now.

you may want change:

var data12 = '<%= globalvariable.data99 %>';

to 

var data12 = parseint('<%= globalvariable.data99 %>');

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