Morris js Display values in percentage format

To add the percentage symbol, please use this property. I did not find this in the docs but it works perfectly. postUnits: ["%"]

For the donut you need to use the formatter parameter

formatter: function (value, data) { return (value/total *100) + '%'; }

See: http://morrisjs.github.io/morris.js/donuts.html

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For the bar you need to use hover callback

hoverCallback: function (index, options, content) {
  var row = options.data[index];
  //assumes you have already calculated the total of your own dataset
  return (value/total *100)+'%';
}

See: http://morrisjs.github.io/morris.js/bars.html