mixed.md

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 %}

Drawing order

By default, datasets are drawn so that first one is top-most. This can be altered by specifying order option to datasets. order defaults to 0.

var mixedChart = new Chart(ctx, {
   type: 'bar',
   data: {
       datasets: [{
           label: 'Bar Dataset',
           data: [10, 20, 30, 40]
           // this dataset is drawn below
           order: 1
       }, {
           label: 'Line Dataset',
           data: [10, 10, 10, 10],
           type: 'line',
           // this dataset is drawn on top
           order: 2
       }],
       labels: ['January', 'February', 'March', 'April']
   },
   options: options
});