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

i modified tektiv answer to show Total only for active sets and move it to tooltips footer.

tooltips: {
        mode: 'label',
        callbacks: {
            afterTitle: function() {
                window.total = 0;
            },
            label: function(tooltipItem, data) {
                var corporation = data.datasets[tooltipItem.datasetIndex].label;
                var valor = data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index];
                window.total += valor;
                return corporation + ": " + valor.toString().replace(/\B(?=(\d{3})+(?!\d))/g, " ");             
            },
            footer: function() {
                return "TOTAL: " + window.total.toString().replace(/\B(?=(\d{3})+(?!\d))/g, " ");
            }
        }
    }