# fillStart

Emitted when range filling starts.

Canonical: https://grid.syidax.com/docs/events/fillStart/

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## What does this API do?

Emitted when range filling starts.

API for Pro features: Fill handle

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## Exact input and result types

```typescript
fillStart: SyGridFillStartEventDetail
```

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## Usage flow

Subscribe with grid.addEventListener('fillStart', handler). The result is in event.detail, and event names are case-sensitive. Remove subscriptions when disposing of the view.

```javascript
const controller = new AbortController();
grid.addEventListener('fillStart', event => {
  console.log(event.detail);
}, { signal: controller.signal });
// On view disposal: controller.abort();
```

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## Read related types

- [SyGridFillStartEventDetail](https://grid.syidax.com/docs/types/SyGridFillStartEventDetail.md)

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## Feature explanations and examples

- [Fill values](https://grid.syidax.com/docs/features/fill-handle.md) — The fill handle copies values or extends a pattern from a source range. Both the drag UI and fillRange API account for editability, validation, and history.