Most charts expose the "select" event, which you can hook into via event
listeners: http://code.google.com/apis/chart/interactive/docs/events.html,
http://code.google.com/apis/ajax/playground/?type=visualization#select_event
As an example:
/* hooks the select event of the chart
* assumes:
* chart is the chart object
*/
google.visualization.events.addListener(chart, 'select', function() {
alert('select event fired');
});
You can call the #getSelection method of the chart object to get the row
and/or column of the DataTable entry representing the chart element
selected.
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