# TreeLoadChildrenParams

> _Since v3.4.0_

Parameters passed to TreeConfig.loadChildren when a node whose
children are not yet loaded is expanded.

## Properties

| Property | Type | Description |
| -------- | ---- | ----------- |
| `row` | <code>T</code> | The parent row whose children are being fetched. |
| `key` | <code>string</code> | Stable key of the parent node (same value as FlattenedTreeRow.key). |
| `depth` | <code>number</code> | Depth of the parent node (0 = root). |
| `signal` | <code>AbortSignal</code> | Cancellation signal. Aborted when the plugin detaches or the grid disconnects. Pass it to `fetch(url, { signal })`. Implementations that ignore it keep working — the superseded request simply completes on the wire and its result is discarded. |