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, " ");

                }
            }
        }

Answer 2

First you should know that if you return an array instead of a single string in the callback of the tooltip, it will display all the strings in your array as if it were different datasets (see this answer for more details).

So I edited a little bit your callback to the following:

callbacks: {
    label: function(tooltipItem, data) {
        var corporation = data.datasets[tooltipItem.datasetIndex].label;
        var valor = data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index];

        // Loop through all datasets to get the actual total of the index
        var total = 0;
        for (var i = 0; i < data.datasets.length; i++)
            total += data.datasets[i].data[tooltipItem.index];

        // If it is not the last dataset, you display it as you usually do
        if (tooltipItem.datasetIndex != data.datasets.length - 1) {
            return corporation + " : $" + valor.toFixed(2).replace(/(\d)(?=(\d{3})+\.)/g, '$1,');
        } else { // .. else, you display the dataset and the total, using an array
            return [corporation + " : $" + valor.toFixed(2).replace(/(\d)(?=(\d{3})+\.)/g, '$1,'), "Total : $" + total];
        }
    }
}

You can see the full code in this jsFiddle, and here is its result :

Answer 3

@Haider this is what you were looking for, I had the same problem. I have reused your code and built upon it @tektiv

I have made one small change where instead of building into the label I have made use of the afterbody. This removes the key color

afterBody code:

                afterBody: function (tooltipItem, data) {
                  var corporation = data.datasets[tooltipItem[0].datasetIndex].label;
                var valor = data.datasets[tooltipItem[0].datasetIndex].data[tooltipItem[0].index];
                var total = 0;
                for (var i = 0; i < data.datasets.length; i++)
                    total += data.datasets[i].data[tooltipItem[0].index];  
                return "Total : $" + total;
            }

Full code here at JSFiddle

Picture demonstration of the finished tooltip

Answer 4

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, " ");
            }
        }
    }

Answer 5

In the other answers you replace the last dataset, with this you don't need to

tooltips: {
    callbacks: {
        title: function(tooltipItems, data) {
            return _this.chart.data.labels[tooltipItems[0].index];
        },
        footer: function(tooltipItems, data) {
            let total = 0;
            for (let i = 0; i < tooltipItems.length; i++) {
                total += parseInt(tooltipItems[i].yLabel, 10);
            }
            return 'Total: ' + total;
        }
    }
}

Ps: It's typescript lang.

Answer 6

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/