API REFERENCE
noDataValue
Calendar heatmap: what a day without entries reads — a number (default 0 → the ramp's first colour) or nan (→ empty-color).
Definition
| Item | Value |
|---|---|
| JavaScript property | noDataValue |
| HTML attribute | Pass objects, arrays, and callbacks as JavaScript properties |
| Type | number | 'nan' |
| Default | undefined |
| Literals in the type | nan |
undefined means this property was not explicitly set. The effective value may depend on the chart type and other settings.