Accepted answer

In previous versions of Chart.js (for example 2.6) the onHover handler has to be configured as below:

  hover: { 
     onHover: function(evt, item) { 
        if (item.length) {
            console.log("onHover", item, evt.type);
            console.log(">data", item[0]._index, data.datasets[0].data[item[0]._index]);

itme[0]._index property points to data of target item

So your fiddle (chart.js 2.6) updated is:

With chart.js 2.7:

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