Charts Tooltip

Tooltips show the exact values behind chart marks — for one item or every series at a shared axis position.

Choose item mode to describe one mark, or axis mode to compare every series at the same x position. Format values with series and axis formatters, or supply custom content when you need extra columns. Axis tooltips require axis tracking on the chart container.

• Dashboards where users need precise values on hover without cluttering the plot.
• Axis crosshair tooltips that list all series at one category or time index.
• Currency or unit formatting via value_formatter on series and axes.

• Set tooltip=TooltipConfig::item() for mark-level values (bars, points, slices).
• Set tooltip=TooltipConfig::axis() for multi-series comparison at a shared x position.
• Wire value_formatter on series and tick_format on axes for domain-specific labels.
• Use composition mode with ChartTooltip when you need fully custom tooltip panels.