Here is my HTML file with the JavaScript
My problem is I cannot get anything to appear. What am i doing wrong.
<html>
<head>
<script type="text/javascript"
src="https://www.gstatic.com/charts/loader.js";></script>
<script type="text/javascript">
// Load the Visualization API and the piechart package.
google.visualization.load('current', {'packages':['corechart']});
// Set a callback to run when the Google Visualization API is loaded.
google.visualization.setOnLoadCallback(drawChart);
var data1 = google.visualization.arrayToDataTable([
['Language', 'Speakers (in millions)'],
['Cat 1', 26], ['Cat 3', 16], ['Cat 2', 30],
['Total', 100]
]);
var data2 = google.visualization.arrayToDataTable([
['Language', 'Speakers (in millions)'],
['Cat 1', 100], ['Cat 3', 200], ['Cat 2', 300],
['Total', 400]
]);
var options = {
title: 'Indian Language Use',
legend: 'none',
pieSliceText: 'label',
slices: { 1: {offset: 0.2},
2: {offset: 0.3},
3: {offset: 0.4},
4: {offset: 0.5},
},
animation: {
startup:true,
duration: 1000,
easing: 'in'
}
};
var current = 0;
var data = [];
data[0] = google.visualization.arrayToDataTable(data1);
data[1] = google.visualization.arrayToDataTable(data2);
var chart = new
google.visualization.PieChart(document.getElementById('piechart'));
var button = document.getElementById('b1');
function drawChart() {
// Disabling the button while the chart is drawing.
button.disabled = true;
google.visualization.events.addListener(chart, 'ready',
function() {
button.disabled = false;
button.value = 'Switch to ' + (current ? 'Tea' : 'Coffee');
});
options['title'] = 'Monthly ' + (current ? 'Coffee' : 'Tea') + '
Production by Country';
chart.draw(data[current], options);
}
button.onclick = function() {
current = 1 - current;
drawChart();
}
drawChart();
</script>
</head>
<body>
<div id="piechart"></div>
<div id="b1"></div>
</body>
</html>
If someone could explain why the charts or the button is not being drawn. I
would be much appreciative.
Thank you.
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