Morris.Donut({ element: 'graph', data: [ {value: 70, label: 'foo'}, {value: 15, label: 'bar'}, {value: 10, label: 'baz'}, {value: 5, label: 'A really really long label'} ], formatter: function (x) { return x + "%"} }).on('click', function(i, row){ console.log(i, row); });