var chart = c3.generate({ bar: { width: 15 }, padding: { left: 60 }, data: { x: 'Letter', columns: [ ['Letter', 'A','B','C','D'], ['value', 25,50,75,100] ], type: 'bar', onclick: function(e) { console.log(ylist[e.x]);a = this;} }, axis: { x: { type: 'category' } }, legend: { show: false } });
<body> <div id="chart"></div> </body>