# CartesianSeriesEventHandler

The CartesianSeriesEventHandler type declaration and related types. Optional fields are marked with ?.

Canonical: https://chart.syidax.com/docs/types/CartesianSeriesEventHandler/

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## Type declaration

```typescript
export type CartesianSeriesEventHandler = (event: { seriesId?: CartesianSeriesId; seriesIndex: number; seriesName?: string; original?: Event }) => void;
```

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## Related types

- [CartesianSeriesId](https://chart.syidax.com/docs/types/CartesianSeriesId.md)