How get sum of total values in stackedBar ChartJs

Question

I\'m trying to get the sum of all values of a stackedBar and include this total in tooltip.

Note: my datasets aren\'t static, this is an example

Answer 1

Shorter version of Gaspar's answer:

tooltips: {
  callbacks: {
    footer: (tooltipItems, data) => {
      let total = tooltipItems.reduce((a, e) => a + parseInt(e.yLabel), 0);
      return 'Total: ' + total;
    }
  }
}

Example: https://jsfiddle.net/g3ba60zc/2/