Charts - Tooltip

Tooltip provides extra data on charts item.

In all charts components, you can pass props to the tooltip by using tooltip={{...}}. If you are using composition, you can add the <ChartsTooltip /> component and pass props directly.

Tooltip trigger

The tooltip can be triggered by two kinds of events:

• 'item'—when the user's mouse hovers over an item on the chart, the tooltip will display data about this specific item.
• 'axis'—the user's mouse position is associated with a value of the x-axis. The tooltip will display data about all series at this specific x value.

Highlights

Highlighting axis

You can highlight data based on mouse position. By default, those highlights are lines, but it can also be a vertical band if your x-axis use scaleType: 'band'.

On the chart, to customize this behavior, you can use:

axisHighlight={{
  x: 'line', // Or 'none', or 'band'
  y: 'line', // Or 'none'
}}

Highlighting series

In parallel with the tooltip, you can highlight/fade elements.

This kind of interaction is controlled by series properties highlightScope which contains two options:

• highlighted Indicates which item to highlight. Its value can be
  • 'none' Do nothing (default one).
  • 'item' Only highlight the item itself.
  • 'series' Highlight all items of the series.
• faded Indicates which item to fade (if they are not already highlighted). Its value can be
  • 'none' Do nothing (default one).
  • 'series' Fade all the items of the series.
  • 'global' Fade all the items of the chart.

Customization

Formatting

The format of data rendered in the tooltip can be modified thanks to the series valueFormatter property. The same can be applied to x values when a tooltip is triggered by the 'axis'.

Here is a demo with:

• The time axis is formatted to only show the year
• The number values are formatted in U.S. Dollars.

Advanced formatting

The series valueFormatter provides a context as its second argument containing a dataIndex property which you can use to calculate other data-related values.

In the demo below you can notice we use dataIndex to add each team's rank in the tooltip.

Axis formatter

To modify how data is displayed in the axis use the valueFormatter property.

Its second argument is a context that provides a location property with either 'tick' or 'tooltip'.

In this demo, you can see:

• The country axis displays only the country code
• The label displays annotated data Country: name (code)

Hiding values

You can hide the axis value with hideTooltip in the xAxis props. It will remove the header showing the x-axis value from the tooltip.

<LineChart
  // ...
  xAxis={[{ data: [ ... ], hideTooltip: true }]}
/>

Overriding content

To modify the tooltip content, use slots.itemContent or slots.axisContent. The first one is rendered when tooltip trigger is set to "item". The second one when trigger is set to "axis".

// With single component
<LineChart
  slots={{
    itemContent: CustomItemTooltip
  }}
/>

// With composition
<ChartContainer>
  // ...
  <Tooltip
    trigger='item'
    slots={{
      itemContent: CustomItemTooltip
    }}
  />
</ChartContainer>

Composition

If you're using composition, by default, the axis will be listening for mouse events to get its current x/y values. If you don't need it, you can disable those listeners with the disableAxisListener prop.

You need those listeners if you are using axes highlight or you have a tooltip triggered by axis.

<ChartContainer {...} disableAxisListener>
  {/* ... */}
</ChartContainer>

API

See the documentation below for a complete reference to all of the props and classes available to the components mentioned here.

• <ChartsAxisHighlight />
• <ChartsAxisTooltipContent />
• <ChartsItemTooltipContent />
• <ChartsTooltip />
• <DefaultChartsAxisTooltipContent />
• <DefaultChartsItemTooltipContent />