mixed charts / dataset types do not work

[benmccann]

There are three problems:

1. scatter doesn't work with a mixed chart type. The reason is because controllers.scatter needs to have showLines: false. However, this only gets applied if chart.type: 'scatter'. scatter and linear should be able to have their own controller options instead of both fighting for the same global options. If chart.data.datasets[0].type = 'scatter' the scatter defaults don't get taken into consideration.

2. You can't use a bar with a mixed chart type unless you manually set categoryPercentage and barPercentage. categoryPercentage and barPercentage shouldn't be set on the scale because they're options for the bar chart and are not options for the scale. The code currently only sets these values on the category scale which means you can't use a bar chart with other scales that it would be compatible with such as the time scale. These options be set on the dataset and we should have a default value there. This would also allow you to plot multiple bar datasets with differing categoryPercentage and barPercentage values

3. horizontalBar charts cannot be combined with any other chart type because no other chart supports being horizontal as reported in [FEATURE] Horizontal bar chart in combination with a line chart #4047 & Horizontal Bars mix with lines #4096. The other controllers should be made aware of indexScale and valueScale concepts. For steps towards a solution, see Return correct label for value type axis #5920 and Replace tooltip item xLabel and yLabel with label and value #5996

[rugk]

When will this be fixed. This whole mixed types do not work?

Even the example on https://www.chartjs.org/docs/latest/charts/mixed.html does not work.

[rugk]

In my case I want to use line together with scatter. Is there a workaround that makes this possible?

[benmccann]

Mixed line and scatter chart has been fixed in master, so will be fixed with the next release

[etimberg]

@benmccann have you been able to test these since the 2.9 release?

[benmccann]

Closing as fixed

[denrolya]

What about obvious mixing of bars & lines? Is there any special configuration for this?

[benmccann]

You don't need to do much special really. See https://www.chartjs.org/docs/latest/charts/mixed.html