Chartjs-Stacked Bar Chart With Line Chart In Charts.js

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See Chart.js docs for reference:
https://www.chartjs.org/docs/latest/charts/bar.html#stacked-bar-chart

Say you added another dataset:

{
  label: "Dataset3",
  type: "bar",
  backgroundColor: "#00ff00",
  borderColor: "#00ff00",
  borderWidth: 1,
  fill: true,
  xAxisID: "axis-bar",
  data: [ 149703, 122015, 123596, 164856, 136928, 220957, 213136, 235956, 187194, 183432, 163078, 138721 ]
}

Solution

You need to add extra config to your X and Y axis scales:

scales: {
  xAxes: [ { stacked: true }],
  yAxes: [ { stacked: true }]
}

Example

var ctx = document.getElementById("myChart").getContext('2d');
var myChart = new Chart(ctx, {
    type: 'bar',
    data: {
        labels: ["<  1","1 - 2","3 - 4","5 - 9","10 - 14","15 - 19","20 - 24","25 - 29","> - 29"],
        datasets: [{
      label: "Dataset1",
      type: "line",
      backgroundColor: "#0000FF",
      borderColor: "#0000FF",
      borderWidth: 1,
      fill: false,
      yAxisID: "axis-time",
      data: [12296,12381,9141,24203,21987,21801,65394,91892,57645,44637,22631,17502]
    },{
      label: "Dataset2",
      type: "bar",
      backgroundColor: "#ff0000",
      borderColor: "#ff0000",
      borderWidth: 1,
      fill: true,
      yAxisID: "axis-bar",
      data: [
  149703, 122015,
  123596, 164856,
  136928, 220957,
  213136, 235956,
  187194, 183432,
  163078, 138721
]
    },{
      label: "Dataset3",
      type: "bar",
      backgroundColor: "#00ff00",
      borderColor: "#00ff00",
      borderWidth: 1,
      fill: true,
      yAxisID: "axis-bar",
      data: [
  149703, 122015,
  123596, 164856,
  136928, 220957,
  213136, 235956,
  187194, 183432,
  163078, 138721
]
    }],
    },
options: {
    tooltips: {
      displayColors: true,
    },
    scales: {
      xAxes: [{
        stacked: true,
      }],
      yAxes: [{
        stacked: true,
        id: 'axis-bar'
      }, {
        stacked: true,
        id: 'axis-time',
        display: false,
      }]
    },
        responsive: true,
        maintainAspectRatio: false,
        legend: { display: false },
    legendCallback: function(chart) {
      var text = [];
      text.push('<ul class="' + chart.id + '-legend">');
      var data = chart.data;
      var datasets = data.datasets;
      if (datasets.length) {
        for (var i = 0; i < datasets.length; ++i) {
            text.push('<li>');
            if (datasets[i].type=='line') {
            text.push('<span class="'+datasets[i].type+'" style="background-color:' + datasets[i].backgroundColor + '"></span>');
          } else {
            text.push('<span class="'+datasets[i].type+'" style="background-color:' + datasets[i].backgroundColor + '"></span>');
          }
          text.push(datasets[i].label);
          text.push('</li>');
        }
      }
      text.push('</ul>');
      return text.join('');
    }
    }
});

var legend = myChart.generateLegend();
document.getElementById("legend").innerHTML = legend;
canvas{
  background:#fff;
  height:400px;
}
<script src="https://www.chartjs.org/dist/2.9.3/Chart.min.js"></script>
<div class="wrapper">
 <canvas id="myChart"></canvas>
  <div id="legend"></div>
</div>

I also created a CodePen with the same code that shows the stacked bars & line chart:
https://codepen.io/pzi/pen/GRoObmq

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