When i tried to plot the data with Google Visualization API, the data point is not in chronological order.
There are 2 ways to solve the problem
1. Sort the data before adding the the DataTable.
***Or***
Continue reading Google Visualization API – Sort by Date
Here is an example on binding the select event handler on the data point.
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<script type="text/javascript">
google.load("visualization", "1", {packages:["corechart"]});
google.setOnLoadCallback(drawChart);
function drawChart() {
var rawData = [
['Year', 'Sales', 'Expenses'],
['2004', 1000, 400],
['2005', 1170, 460],
['2006', 660, 1120],
['2007', 1030, 540]
];
var data = google.visualization.arrayToDataTable(rawData);
var options = {
title: 'Company Performance'
};
var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
// Add the select event handler
google.visualization.events.addListener(chart, 'select', function () {
var sel = chart.getSelection();
sel = sel[0];
if (sel && sel['row'] && sel['column']) {
var year = rawData[sel['row'] + 1][0];
var salesValue = rawData[sel['row'] + 1][1];
var expensesValue = rawData[sel['row'] + 1][2];
console.log("year: " + year + ", sales: " + salesValue + ", expenses: " + expensesValue);
}
});
chart.draw(data, options);
}
</script>
</head>
<body>
<div id="chart_div" style="width: 900px; height: 500px;"></div>
</body>
</html>
Continue reading Google Visualization API – Implement event handler on data point
Eureka! 