// Load the Visualization API and the piechart package.
google.load('visualization', '1.0', {'packages':['corechart']});
// Set a callback to run when the Google Visualization API is loaded.
google.setOnLoadCallback(drawChart);
// Callback that creates and populates a data table,
// instantiates the pie chart, passes in the data and
// draws it.
function drawChart() {
// Create the data table.
var data = new google.visualization.DataTable();
data.addColumn('string', 'Topping');
data.addColumn('number', 'Slices');
var myData = {
'Mushrooms': 3,
'Onions': 1,
'Olives': 1,
'Zucchini': 1,
'Pepperoni': 2
};
var rows = [];
for (element in myData) {
rows.push([element + " (" + myData[element] + ")", myData[element]])
}
data.addRows(rows);
// Set chart options
var options = {'title':'How Much Pizza I Ate Last Night',
'width':450,
'height':300};
// Instantiate and draw our chart, passing in some options.
var chart = new google.visualization.PieChart(document.getElementById('chart_div'));
chart.draw(data, options);
}
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<div id="chart_div"></div>