# valueChange

CustomEvent.detail type: { value: number; fraction: number }. Event names are case-sensitive.

Canonical: https://chart.syidax.com/docs/events/valueChange/

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## Definition

Event name: `valueChange`. Names are case-sensitive. Read the payload from `detail` on `CustomEvent<{ value: number; fraction: number }>`.

```javascript
chart.addEventListener('valueChange', event => {
  console.log(event.detail); // { value: number; fraction: number }
});
```

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## Related charts

- [sy-gauge-chart](https://chart.syidax.com/docs/components/gauge.md#event-valueChange)