Hi,
I'm trying out Google Charts for the first time. Basically, I want it to
display information from a database. The database has the following fields:
Name | Age | Nationality
I wrote a PHP / SQL query that groups the Nationality and displays the
amount. For example:
India - 10
Australia- 15
US - 5
I want the above info to be displayed in a pie chart. When I run my code, I
get a blank screen. Please check it and let me know how I can fix it.
<?php
error_reporting(E_ALL ^ E_DEPRECATED);
$con = mysql_connect("localhost","root","");
if (!$con) {
die('Could not connect: ' . mysql_error());
}
mysql_select_db("test", $con);
?>
<html>
<head>
<!--Load the AJAX API-->
<script type="text/javascript"
src="https://www.google.com/jsapi";></script>
<script type="text/javascript">
// 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);
<?php
$query = "SELECT Nationality, COUNT(Nationality) AS Total FROM
event1 GROUP BY Nationality";
$result= mysql_query($query);
$pieData = array();
while($rows = mysql_fetch_array($result)){
$pieData[] = array($row['Nationality'], $row['Total']);
}
?>
// Callback that creates and populates a data table,
// instantiates the pie chart, passes in the data and
// draws it.
function drawChart() {
// Create the data table.
var data = new google.visualization.DataTable();
data.addColumn('string', 'Nationality');
data.addColumn('number', 'Total');
data.addRows(<?php echo json_encode($pieData, JSON_NUMERIC_CHECK);
?>);
// Set chart options
var options = {'title':'Nationalities',
'width':800,
'height':700};
// Instantiate and draw our chart, passing in some options.
var chart = new
google.visualization.PieChart(document.getElementById('chart_div'));
chart.draw(data, options);
}
</script>
</head>
<body>
<!--Div that will hold the pie chart-->
<div id="chart_div"></div>
</body>
</html>
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