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

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2022-07-05 13:41:43 +00:00
---
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.