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

Using Chart.js 2.5.0

var valor = data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index];

returns a string value. To calculate the correct sum value you have to add a parseFloat statement:

    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];

                      //THIS ONE:
                    valor=parseFloat(valor);

        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, " ");

                }
            }
        }