# AreaTrigger.bindOnEnter

Binds an area trigger's onEnter event to a custom callback. The onEnter event is triggered when an object enters the trigger area.

**Kind:** Function

**Environments:** Game

## Game

``` { .lua .api-signature }
areaTrigger:bindOnEnter( callback, object? )
```

[Open the full Game reference](../Game-Script-Environment/Userdata/AreaTrigger.md#bindonenter)

The callback receives:

- <strong>self</strong> (<em>table</em>) &ndash; The class instance.
- <strong>trigger</strong> (<em>[AreaTrigger](../Game-Script-Environment/Userdata/AreaTrigger.md)</em>) &ndash; The area trigger instance.
- <strong>results</strong> (<em>table</em>) &ndash; A table of [characters](../Game-Script-Environment/Userdata/Character.md) and/or [bodies](../Game-Script-Environment/Userdata/Body.md) and/or [harvestables](../Game-Script-Environment/Userdata/Harvestable.md) and/or [lifts](../Game-Script-Environment/Userdata/Lift.md) and/or [areaTriggers](../Game-Script-Environment/Userdata/AreaTrigger.md).

```lua
function MyClass.onEnter( self, trigger, results ) ...
```

**Parameters:**

| Name | Type | Description |
| --- | --- | --- |
| `areaTrigger` | [AreaTrigger](../Game-Script-Environment/Userdata/AreaTrigger.md) | The area trigger instance. |
| `callback` | string | The name of the Lua function to bind. |
| `object` *(optional)* | table | The object that will receive the callback. (optional) |