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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

Properties available on the AgBarSeriesOptions interface.

xKey *
string
The key to use to retrieve x-values from the data.
type
'bar' | 'column'
'bar' | 'column'
grouped
boolean
Whether to show different y-values as separate bars (grouped) or not (stacked).
Default: false
stacked
boolean
boolean
normalizedTo
number
The number to normalise the bar stacks to. Has no effect when grouped is true. For example, if normalizedTo is set to 100, the bar stacks will all be scaled proportionally so that each of their totals is 100.
yKey
string
The keys to use to retrieve y-values from the data.
xName
string
A human-readable description of the x-values. If supplied, this will be shown in the default tooltip and passed to the tooltip renderer as one of the parameters.
yName
string
Human-readable description of the y-values. If supplied, a corresponding yName will be shown in the default tooltip and passed to the tooltip renderer as one of the parameters.
flipXY
boolean
boolean
fill
CssColor
The colour to use for the fill of the area.
fill: CssColor;

type CssColor = string
stroke
CssColor
The colours to use for the stroke of the bars.
stroke: CssColor;

type CssColor = string
strokeWidth
PixelSize
The width in pixels of the stroke for the bars.
Default: 1
strokeWidth: PixelSize;

type PixelSize = number
fillOpacity
Opacity
The opacity of the fill for the bars.
Default: 1
fillOpacity: Opacity;

type Opacity = number
strokeOpacity
Opacity
The opacity of the stroke for the bars.
Default: 1
strokeOpacity: Opacity;

type Opacity = number
lineDash
PixelSize[]
Defines how the bar/column strokes are rendered. Every number in the array specifies the length in pixels of alternating dashes and gaps. For example, [6, 3] means dashes with a length of 6 pixels with gaps between of 3 pixels.
lineDash: PixelSize[];

type PixelSize = number
lineDashOffset
PixelSize
The initial offset of the dashed line in pixels.
Default: 0
lineDashOffset: PixelSize;

type PixelSize = number
shadow
AgDropShadowOptions
Configuration for the shadow used behind the chart series.
shadow: AgDropShadowOptions;

interface AgDropShadowOptions {
  // Whether or not the shadow is visible. 
  enabled?: boolean;
  // The colour of the shadow. 
  color?: CssColor;
  // The horizontal offset in pixels for the shadow. 
  xOffset?: PixelSize;
  // The vertical offset in pixels for the shadow. 
  yOffset?: PixelSize;
  // The radius of the shadow's blur, given in pixels. 
  blur?: PixelSize;
}

type CssColor = string

type PixelSize = number
label
AgBarSeriesLabelOptions
Configuration for the labels shown on bars.
label: AgBarSeriesLabelOptions;

interface AgBarSeriesLabelOptions {
  // Function used to turn 'yKey' values into text to be displayed by a label. By default the values are simply stringified. 
  formatter?: (params: { value: number; }) => string;
  // Where to render series labels relative to the segments. 
  placement?: 'inside' | 'outside';
  // Whether or not the labels should be shown. 
  enabled?: boolean;
  // The font style to use for the labels. 
  fontStyle?: FontStyle;
  // The font weight to use for the labels. 
  fontWeight?: FontWeight;
  // The font size in pixels to use for the labels. 
  fontSize?: FontSize;
  // The font family to use for the labels. 
  fontFamily?: FontFamily;
  // The colour to use for the labels. 
  color?: CssColor;
}

type FontStyle = 
      'normal' 
    | 'italic' 
    | 'oblique'


type FontWeight = 
      'normal' 
    | 'bold' 
    | 'bolder' 
    | 'lighter' 
    | '100' 
    | '200' 
    | '300' 
    | '400' 
    | '500' 
    | '600' 
    | '700' 
    | '800' 
    | '900'


type FontSize = number

type FontFamily = string

type CssColor = string
tooltip
AgBarSeriesTooltip
Series-specific tooltip configuration.
tooltip: AgBarSeriesTooltip;

interface AgBarSeriesTooltip {
  // Function used to create the content for tooltips. 
  renderer?: (params: AgCartesianSeriesTooltipRendererParams) => string | AgTooltipRendererResult;
  // Whether or not to show tooltips when the series are hovered over. 
  enabled?: boolean;
}

interface AgCartesianSeriesTooltipRendererParams {
  xKey: string;
  xValue?: any;
  xName?: string;
  yKey: string;
  yValue?: any;
  yName?: string;
  datum: any;
  title?: string;
  color?: CssColor;
}

type CssColor = string

interface AgTooltipRendererResult {
  title?: string;
  content?: string;
}
formatter
Function
Function used to return formatting for individual bars/columns, based on the given parameters. If the current bar/column is highlighted, the highlighted property will be set to true; make sure to check this if you want to differentiate between the highlighted and un-highlighted states.
formatter = (
    params: AgBarSeriesFormatterParams
) => AgBarSeriesFormat;

interface AgBarSeriesFormatterParams {
  datum: any;
  fill?: CssColor;
  stroke?: CssColor;
  strokeWidth: PixelSize;
  highlighted: boolean;
  xKey: string;
  yKey: string;
}

type CssColor = string

type PixelSize = number

interface AgBarSeriesFormat {
  fill?: CssColor;
  stroke?: CssColor;
  strokeWidth?: PixelSize;
}
data
any[]
The data to use when rendering the series. If this is not supplied, data must be set on the chart instead.
visible
boolean
Whether or not to display the series.
showInLegend
boolean
Whether or not to include the series in the legend.
cursor
string
The cursor to use for hovered area markers. This config is identical to the CSS cursor property.
listeners
AgBaseSeriesListeners | {[key: string]: Function}
A map of event names to event listeners.
listeners: AgBaseSeriesListeners | {[key: string]: Function};

interface AgBaseSeriesListeners {
  // The listener to call when a node (marker, column, bar, tile or a pie slice) in the series is clicked. 
  nodeClick: (params: { type: 'nodeClick'; series: any; datum: any; xKey: string; yKey: string; }) => any;
}
highlightStyle
AgSeriesHighlightStyle
Configuration for series markers and series line highlighting when a marker / data point or a legend item is hovered over.
highlightStyle: AgSeriesHighlightStyle;

interface AgSeriesHighlightStyle {
  // Highlight style used for an individual marker when tapped or hovered over. 
  item?: AgSeriesHighlightMarkerStyle;
  // Highlight style used for whole series when one of its markers is tapped or hovered over. 
  series?: AgSeriesHighlightSeriesStyle;
}

interface AgSeriesHighlightMarkerStyle {
  // The fill colour of a marker when tapped or hovered over. Use `undefined` for no highlight. 
  fill?: CssColor;
  // The stroke colour of a marker when tapped or hovered over. Use `undefined` for no highlight. 
  stroke?: CssColor;
  // The stroke width of a marker when tapped or hovered over. Use `undefined` for no highlight. 
  strokeWidth?: PixelSize;
}

type CssColor = string

type PixelSize = number

interface AgSeriesHighlightSeriesStyle {
  enabled?: boolean;
  // The opacity of the whole series (area line, area fill, labels and markers, if any) when another chart series or another stack level in the same area series is highlighted by hovering a data point or a legend item. Use `undefined` or `1` for no dimming. 
  dimOpacity?: Opacity;
  // The stroke width of the area line when one of the markers is tapped or hovered over, or when a tooltip is shown for a data point, even when series markers are disabled. Use `undefined` for no highlight. 
  strokeWidth?: PixelSize;
}

type Opacity = number

Next Up

Continue to the next section to learn about histogram series.