Highcharts percentage of total for simple bar chart

Question

I have a simple 1-series bar chart where each bar has a nominal value. I can plot this fine with the data labels and axis representing the value for each bar but I\'d like t

Answer 1

@jlbriggs had a great answer and lead me onto the path of creating this formatter function. This function always checks the current values in the data. If the data is updated programmatically at a later time, the percentages will reflect the newly updated data. No dataSum or loop is necessary as the .map().reduce() takes care of that for you.

dataLabels: {
  enabled: true,
  formatter: function() {
    var pcnt = (this.y / this.series.data.map(p => p.y).reduce((a, b) => a + b, 0)) * 100;
    return Highcharts.numberFormat(pcnt) + '%';
  }
}