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.