puppeteer/docs/api/puppeteer.eventemitter.on.md

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sidebar_label: EventEmitter.on
---
# EventEmitter.on() method

Bind an event listener to fire when an event occurs.

**Signature:**

```typescript
class EventEmitter {on(event: EventType, handler: Handler): EventEmitter;}
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  event | [EventType](./puppeteer.eventtype.md) | the event type you'd like to listen to. Can be a string or symbol. |
|  handler | [Handler](./puppeteer.handler.md) | the function to be called when the event occurs. |

**Returns:**

[EventEmitter](./puppeteer.eventemitter.md)

`this` to enable you to chain method calls.