score:12

Accepted answer

This can be easily achieved using a Chart.js plugin called : chartjs-plugin-datalabels.

Here is the minimum options that need to be set for this plugin to display values inside (middle) of the stacked bars :

options: { //your chart options
   plugins: {
      datalabels: {
         display: true,
         align: 'center',
         anchor: 'center'
      }
   }
}

although, there are tons of other options that you can use to further customize these values/labels (inside bars), which can be found here.

ᴡᴏʀᴋɪɴɢ ᴇxᴀᴍᴘʟᴇ ⧩

var numberWithCommas = function(x) {
   return x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
};

var dataPack1 = [50000, 22000, 26000, 35000, 55000, 55000, 56000, 59000, 60000, 61000, 60100, 62000];

var dataPack2 = [0, 6000, 13000, 14000, 50060, 20030, 20070, 35000, 41000, 4020, 40030, 70050];

var dates = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];

// Chart.defaults.global.elements.rectangle.backgroundColor = '#FF0000';

var bar_ctx = document.getElementById('bar-chart');
var bar_chart = new Chart(bar_ctx, {
   type: 'bar',
   data: {
      labels: dates,
      datasets: [{
         label: 'SoftEnterprises, Sales',
         data: dataPack1,
         backgroundColor: "rgba(55, 160, 225, 0.7)",
         hoverBackgroundColor: "rgba(55, 160, 225, 0.7)",
         hoverBorderWidth: 2,
         hoverBorderColor: 'lightgrey'
      }, {
         label: 'SmartSystems, Sales',
         data: dataPack2,
         backgroundColor: "rgba(225, 58, 55, 0.7)",
         hoverBackgroundColor: "rgba(225, 58, 55, 0.7)",
         hoverBorderWidth: 2,
         hoverBorderColor: 'lightgrey'
      }, ]
   },
   options: {
      tooltips: {
         mode: 'label',
         callbacks: {
            label: function(tooltipItem, data) {
               return data.datasets[tooltipItem.datasetIndex].label + ": " + numberWithCommas(tooltipItem.yLabel);
            }
         }
      },
      scales: {
         xAxes: [{
            stacked: true,
            gridLines: {
               display: false
            },
         }],
         yAxes: [{
            stacked: true,
            ticks: {
               callback: function(value) {
                  return numberWithCommas(value);
               },
            },
         }],
      }, // scales
      legend: {
         display: true
      },
      plugins: {
         datalabels: {
            display: true,
            align: 'center',
            anchor: 'center'
         }
      }
   } // options
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.1/Chart.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-datalabels"></script>


<canvas id="bar-chart" width="600" height="350"></canvas>


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