# yCategories

Heatmap: row labels (row 0 is the top row).

Canonical: https://chart.syidax.com/docs/options/yCategories/

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## Definition

| Item | Value |
| --- | --- |
| JavaScript property | `yCategories` |
| HTML attribute | Pass objects, arrays, and callbacks as JavaScript properties |
| Type | `HeatmapCategoriesInput` |
| Default | `undefined` |

undefined means this property was not explicitly set. The effective value may depend on the chart type and other settings.

- [HeatmapCategoriesInput](https://chart.syidax.com/docs/types/HeatmapCategoriesInput.md) — Type definition

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## Related documentation

A property with the same name may have different types and defaults across charts. When using a direct tag, follow that chart's documentation below.

- [Shared facade and direct tags](https://chart.syidax.com/docs/concepts.md)
- [sy-heatmap](https://chart.syidax.com/docs/components/heatmap.md#property-yCategories)
- [sy-bar-3d](https://chart.syidax.com/docs/components/bar-3d.md#property-yCategories)