Select event not fired on Google chart API for Sankey

I'm trying to hook an event to a click on a Google Sankey diagram. The Events claim to include select but it doesn't fire on Chrome or Safari. onmouseover/onmouseout/ready seem to be hooked up if the event is switched in the code below -- I get something in the console log. That is switching the line:

google.visualization.events.addListener(chart, 'select', selectHandler);


google.visualization.events.addListener(chart, 'onmouseover', selectHandler);

shows the event listener is connected.

I've tried this on other newer chart types like word-trees and select is connected. What have I missed?


<script type='text/javascript' src='https://www.google.com/jsapi'</script>   
<script type='text/javascript'>

google.load('visualization', '1.1', {packages:['sankey']});
function drawChart() {
    var data = new google.visualization.DataTable();
        data.addColumn('string', 'A');
        data.addColumn('string', 'B');
        data.addColumn('number', 'Mails');
            ['from elvis','frank', 285],
            ['frank', 'to wendy', 61],
   var options = {width: 600};
   var chart = new google.visualization.Sankey(document.getElementById('thechart'));        

google.visualization.events.addListener(chart, 'select', selectHandler);

function selectHandler() {
    console.log('You selected ' + JSON.stringify(chart.getSelection()));

chart.draw(data, options);  
<div id='thechart' style='width: 600px; height: 300px;'></div>  

You have to set correct options:

 // Sets chart options.
 var options = {
        width: 600,
        sankey: {
            node: {
                interactivity: true

I used this example https://jsfiddle.net/5mvx6bdr/ Works perfect :)

sankey: node: interactivity is set to false by default.

Select event not fired on Google chart API for Sankey
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