# `DragOptions.on`

> Contract 2.0.0 · package sha256 `a857eca95b35921109faf997094bb4192f12527d9d0fcd4be7e97f06425bad6e` · generated from `configurator-runtime.d.ts` by `services/onsite-scripter/scripts/build-contract-docs.mjs`; edit the source, not this file.

Property of [`DragOptions`](DragOptions.md) · stable · since 2.0.0

```ts
on: 'floor' | Query | ((part: Part) => 'floor' | Query);
```

The surface the proposed pose lies on; a function picks it per part at press time.
'floor': the horizontal plane through the unit's world position at press time, so it keeps its
height. A Query: the triangles of the matched parts, whatever their visibility and `pickable`
(a hidden wall works); the proposed position is the hit point plus the grab offset.

## Generic-API test (spec 3.1)

| Rule | Result |
| --- | --- |
| 1. Neutral name | pass: `on` names no product |
| 2. A precedent | not recorded: no ledger row (coverage.json) names this member or its owner |
| 3. Two apps, or labs | not recorded: no ledger row names this member or its owner |
| 4. The cheaper fix first | not recorded per member (Appendix B decides it per need) |