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React Charts: Bar and Column Series

Bar series are commonly used to show values for a discrete set of objects, such as item categories, specific items, or time periods such as years or quarters.

Because bar series are just transposed column series and have the same configuration, this section covers both series at once.

Column Series

Regular Columns

To create a column chart, we need to use series type 'column'. We also have to provide the xKey and yKey properties.

A minimal 'column' series config would therefore look like this:

series: [{
    type: 'column',
    xKey: 'quarter',
    yKey: 'iphone'
}]

In the snippet above we are using 'iphone' as the yKey, to show revenue per quarter for this product. Using this simple series config produces the following chart:

Stacked Columns

If the goal is to show the total quarterly revenue for each product category, multiple stacked series can be used by adding more column-type series.

series: [
    { type: 'column', xKey: 'quarter', yKey: 'iphone', stacked: true },
    { type: 'column', xKey: 'quarter', yKey: 'mac', stacked: true },
    { type: 'column', xKey: 'quarter', yKey: 'ipad', stacked: true },
    { type: 'column', xKey: 'quarter', yKey: 'wearables', stacked: true },
    { type: 'column', xKey: 'quarter', yKey: 'services', stacked: true },
]

This example demonstrates stacked columns using the series configuration above. Additionally:

  • We set yName on each series to configure the display names to provide tooltip headers and legend entries.

Grouped Columns

If we want to show quarterly revenue for each product category as grouped columns, we can simply take the stacked column config from the example above and omit the stacked property.

This will produce the following chart:

Normalized Columns

Going back to our stacked column example, if we wanted to normalize the totals so that each column's segments add up to a certain value, for example 100, we could add the following to our series config:

normalizedTo: 100

It's possible to use any non-zero value to normalize to.

Column Labels

It's possible to add labels to columns, by adding the following to the series config:

label: {}

That's it. The config can be empty like that. However, you might want to customise your labels. For example, by default the values are rounded to two decimal places for the labels, but in the example below even that is too much, so we use a label formatter that simply returns the integer part of the number:

label: {
    formatter: function (params) {
        // if the data contains values that are not valid numbers,
        // the formatter's `value` will be `undefined`
        return params.value === undefined ? '' : params.value.toFixed(0);
    }
}

The above formatter produces an attractive chart where the labels don't stick out of their columns:

It's best to avoid using labels with grouped columns (or bars), because columns in grouped mode tend to be narrow and often won't fit a label.

To learn more about label configuration please refer to the API reference below.

Bar Series

'bar' series configuration is exactly the same as 'column' series configuration and all the same modes (stacked, grouped, normalized) apply to bars just as they do to columns.

To create a bar chart all you need to do is use type: 'bar' instead of type: 'column' in the series options.

series: [{
    type: 'column',
    xKey: 'quarter',
    yKey: 'iphone',
    ...
}]

With this simple change we go from stacked columns to stacked bars:

API Reference

Next Up

Continue to the next section to learn about histogram series.