Mixed Chart Types

With Chart.js, it is possible to create mixed charts that are a combination of two or more different chart types. A common example is a bar chart that also includes a line dataset.

Creating a mixed chart starts with the initialization of a basic chart.

var myChart = new Chart(ctx, {
  type: 'bar',
  data: data,
  options: options
});

At this point we have a standard bar chart. Now we need to convert one of the datasets to a line dataset.

var mixedChart = new Chart(ctx, {
  type: 'bar',
  data: {
    datasets: [{
          label: 'Bar Dataset',
          data: [10, 20, 30, 40]
        }, {
          label: 'Line Dataset',
          data: [50, 50, 50, 50],

          // Changes this dataset to become a line
          type: 'line'
        }],
    labels: ['January', 'February', 'March', 'April']
  },
  options: options
});

At this point we have a chart rendering how we'd like. It's important to note that the default options for a line chart are not merged in this case. Only the options for the default type are merged in. In this case, that means that the default options for a bar chart are merged because that is the type specified by the type field.

{% chartjs %}
{
"type": "bar",
"data": {
"labels": [
"January",
"February",
"March",
"April"
],
"datasets": [{
"label": "Bar Dataset",
"data": [10, 20, 30, 40],
"borderColor": "rgb(255, 99, 132)",
"backgroundColor": "rgba(255, 99, 132, 0.2)"
}, {
"label": "Line Dataset",
"data": [50, 50, 50, 50],
"type": "line",
"fill": false,
"borderColor": "rgb(54, 162, 235)"
}]
},
"options": {
"scales": {
"yAxes": [{
"ticks": {
"beginAtZero": true
}
}]
}
}
}
{% endchartjs %}