# addEventListener

#### addEventListener

Listens for events sent from the scene. Used to receive events from Interactions that have "Send event" as their action.

#### **Signature**

```typescript
addEventListener(eventName: string, callback: (value: any) => void): Promise<void>
```

#### **Parameters**

<table><thead><tr><th width="187.57421875">Parameter</th><th width="121.1328125">Type</th><th width="109.17578125">Required</th><th>Description</th></tr></thead><tbody><tr><td>eventName</td><td>string</td><td>Yes</td><td>Name of the event to listen for</td></tr><tr><td>callback</td><td>function</td><td>Yes</td><td>Function called when event is received</td></tr></tbody></table>

#### **Returns**

`Promise<void>`

#### **Usage**

```javascript
await api.addEventListener("product_clicked", (value) => {
  console.log("Product clicked, value:", value);
});
```

#### **How it works**<br>

1. In Studio, create an Interaction with action **Send event** and specify event name
2. The trigger can be any available Studio trigger (On click, Mouse enter, On load, etc.)
3. When triggered, your callback receives the value of a Variable with the same name as the event

If no Variable with the event name exists, the callback receives `undefined`.

#### **Notes**

* Event name must match the name specified in Studio's "Send event" action
* Multiple listeners can be added for the same event
* Use `removeEventListener()` to stop listening


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